From d678e08f16f6ab325441e0dbec0a1bebe27c9de9 Mon Sep 17 00:00:00 2001
From: Yuchen Xie <xp@yintrust.com>
Date: Sun, 27 Oct 2019 22:43:15 +0800
Subject: [PATCH 01/47] Improve src/main.rs

---
 src/main.rs | 24 +++++++++++-------------
 1 file changed, 11 insertions(+), 13 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index b914f2d9..967c5f85 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -34,7 +34,7 @@ fn main() {
             _ => {
                 id = id_arg
                     .parse::<u32>()
-                    .expect(&format!("not a number: {}", id_arg));
+                    .unwrap_or_else(|_| panic!("not a number: {}", id_arg));
                 if solved_ids.contains(&id) {
                     println!(
                         "The problem you chose is invalid (the problem may have been solved \
@@ -45,16 +45,14 @@ fn main() {
             }
         }
 
-        let problem = problem::get_problem(id).expect(&format!(
-            "Error: failed to get problem #{} \
-             (The problem may be paid-only or may not be exist).",
-            id
-        ));
-        let code = problem
-            .code_definition
-            .iter()
-            .filter(|&d| d.value == "rust")
-            .next();
+        let problem = problem::get_problem(id).unwrap_or_else(|| {
+            panic!(
+                "Error: failed to get problem #{} \
+                 (The problem may be paid-only or may not be exist).",
+                id
+            )
+        });
+        let code = problem.code_definition.iter().find(|&d| d.value == "rust");
         if code.is_none() {
             println!("Problem {} has no rust version.", &id);
             solved_ids.push(problem.question_id);
@@ -100,7 +98,7 @@ fn main() {
     }
 }
 
-fn generate_random_id(except_ids: &Vec<u32>) -> u32 {
+fn generate_random_id(except_ids: &[u32]) -> u32 {
     use rand::Rng;
     use std::fs;
     let mut rng = rand::thread_rng();
@@ -124,7 +122,7 @@ fn get_solved_ids() -> Vec<u32> {
     for path in paths {
         let path = path.unwrap().path();
         let s = path.to_str().unwrap();
-        if s.chars().next().unwrap() != 'n' {
+        if !s.starts_with('n') {
             continue;
         }
         let id = &s[7..11];

From fea41bcf70a764c06bf9a5860036e8b40546d0da Mon Sep 17 00:00:00 2001
From: Jinze Li <lijinze0118@live.com>
Date: Thu, 23 Jan 2020 01:38:51 +0900
Subject: [PATCH 02/47] Fixed the problem of generating wrong id

---
 src/lib.rs                                    | 416 +++++++++---------
 ...ci_number.rs => n0509_fibonacci_number.rs} |   0
 ...inary_search.rs => n0704_binary_search.rs} |   0
 ...ke_sorting.rs => n0969_pancake_sorting.rs} |   0
 ... => n1018_binary_prefix_divisible_by_5.rs} |   0
 ...e_weight.rs => n1046_last_stone_weight.rs} |   0
 src/problem.rs                                |   2 +-
 7 files changed, 209 insertions(+), 209 deletions(-)
 rename src/{n1013_fibonacci_number.rs => n0509_fibonacci_number.rs} (100%)
 rename src/{n0792_binary_search.rs => n0704_binary_search.rs} (100%)
 rename src/{n1009_pancake_sorting.rs => n0969_pancake_sorting.rs} (100%)
 rename src/{n1071_binary_prefix_divisible_by_5.rs => n1018_binary_prefix_divisible_by_5.rs} (100%)
 rename src/{n1127_last_stone_weight.rs => n1046_last_stone_weight.rs} (100%)

diff --git a/src/lib.rs b/src/lib.rs
index 7278e7b0..815c1ce0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,240 +1,240 @@
 #[macro_use]
 pub mod util;
 
-mod n0001_two_sum;
-mod n0002_add_two_numbers;
-mod n0003_longest_substring;
-mod n0004_median_of_two_sorted_arrays;
-mod n0005_longest_palindromic_substring;
 mod n0006_zigzag_conversion;
-mod n0007_reverse_integer;
-mod n0008_string_to_integer_atoi;
-mod n0009_palindrome_number;
-mod n0010_regular_expression_matching;
-mod n0011_container_with_most_water;
-mod n0012_integer_to_roman;
-mod n0013_roman_to_integer;
-mod n0014_longest_common_prefix;
-mod n0015_3sum;
-mod n0016_3sum_closest;
-mod n0017_letter_combinations_of_a_phone_number;
-mod n0018_4sum;
-mod n0019_remove_nth_node_from_end_of_list;
-mod n0020_valid_parentheses;
-mod n0021_merge_two_sorted_lists;
-mod n0022_generate_parentheses;
-mod n0023_merge_k_sorted_lists;
+mod n0238_product_of_array_except_self;
+mod n0115_distinct_subsequences;
+mod n0099_recover_binary_search_tree;
+mod n0310_minimum_height_trees;
+mod n0128_longest_consecutive_sequence;
+mod n0274_h_index;
+mod n0241_different_ways_to_add_parentheses;
 mod n0024_swap_nodes_in_pairs;
-mod n0025_reverse_nodes_in_k_group;
-mod n0026_remove_duplicates_from_sorted_array;
+mod n0110_balanced_binary_tree;
+mod n0093_restore_ip_addresses;
+mod n0076_minimum_window_substring;
+mod n0124_binary_tree_maximum_path_sum;
+mod n0122_best_time_to_buy_and_sell_stock_ii;
+mod n0169_majority_element;
+mod n0162_find_peak_element;
+mod n0095_unique_binary_search_trees_ii;
+mod n0155_min_stack;
+mod n0040_combination_sum_ii;
+mod n0217_contains_duplicate;
+mod n0055_jump_game;
+mod n0106_construct_binary_tree_from_inorder_and_postorder_traversal;
+mod n0145_binary_tree_postorder_traversal;
+mod n0079_word_search;
+mod n0969_pancake_sorting;
+mod n0042_trapping_rain_water;
+mod n0108_convert_sorted_array_to_binary_search_tree;
+mod n0083_remove_duplicates_from_sorted_list;
+mod n0130_surrounded_regions;
+mod n0226_invert_binary_tree;
 mod n0027_remove_element;
+mod n0188_best_time_to_buy_and_sell_stock_iv;
+mod n0204_count_primes;
+mod n0268_missing_number;
+mod n0214_shortest_palindrome;
+mod n0231_power_of_two;
+mod n0202_happy_number;
+mod n0075_sort_colors;
+mod n0066_plus_one;
 mod n0028_implement_strstr;
-mod n0029_divide_two_integers;
+mod n0290_word_pattern;
+mod n0048_rotate_image;
+mod n0089_gray_code;
+mod n0147_insertion_sort_list;
+mod n0084_largest_rectangle_in_histogram;
+mod n0011_container_with_most_water;
+mod n0009_palindrome_number;
+mod n0058_length_of_last_word;
+mod n0080_remove_duplicates_from_sorted_array_ii;
 mod n0030_substring_with_concatenation_of_all_words;
-mod n0031_next_permutation;
-mod n0032_longest_valid_parentheses;
-mod n0033_search_in_rotated_sorted_array;
-mod n0034_find_first_and_last_position_of_element_in_sorted_array;
-mod n0035_search_insert_position;
-mod n0036_valid_sudoku;
-mod n0037_sudoku_solver;
+mod n0060_permutation_sequence;
+mod n0071_simplify_path;
 mod n0038_count_and_say;
-mod n0039_combination_sum;
-mod n0040_combination_sum_ii;
-mod n0041_first_missing_positive;
-mod n0042_trapping_rain_water;
-mod n0043_multiply_strings;
-mod n0044_wildcard_matching;
-mod n0045_jump_game_ii;
-mod n0046_permutations;
-mod n0047_permutations_ii;
-mod n0048_rotate_image;
-mod n0049_group_anagrams;
+mod n0144_binary_tree_preorder_traversal;
+mod n0279_perfect_squares;
+mod n0304_range_sum_query_2d_immutable;
+mod n0292_nim_game;
+mod n0264_ugly_number_ii;
+mod n0132_palindrome_partitioning_ii;
+mod n0019_remove_nth_node_from_end_of_list;
+mod n0136_single_number;
+mod n0018_4sum;
+mod n0220_contains_duplicate_iii;
+mod n0299_bulls_and_cows;
+mod n0232_implement_queue_using_stacks;
+mod n0100_same_tree;
+mod n0171_excel_sheet_column_number;
+mod n0087_scramble_string;
+mod n0704_binary_search;
+mod n0219_contains_duplicate_ii;
+mod n0086_partition_list;
+mod n0082_remove_duplicates_from_sorted_list_ii;
+mod n0228_summary_ranges;
+mod n0020_valid_parentheses;
+mod n0017_letter_combinations_of_a_phone_number;
+mod n0312_burst_balloons;
+mod n0306_additive_number;
+mod n0283_move_zeroes;
+mod n1018_binary_prefix_divisible_by_5;
+mod n0201_bitwise_and_of_numbers_range;
+mod n0109_convert_sorted_list_to_binary_search_tree;
+mod n0101_symmetric_tree;
+mod n0098_validate_binary_search_tree;
+mod n0035_search_insert_position;
 mod n0050_powx_n;
-mod n0051_n_queens;
-mod n0052_n_queens_ii;
-mod n0053_maximum_subarray;
+mod n0198_house_robber;
+mod n0004_median_of_two_sorted_arrays;
+mod n0221_maximal_square;
+mod n0047_permutations_ii;
+mod n0172_factorial_trailing_zeroes;
 mod n0054_spiral_matrix;
-mod n0055_jump_game;
+mod n0053_maximum_subarray;
+mod n1046_last_stone_weight;
+mod n0146_lru_cache;
+mod n0126_word_ladder_ii;
+mod n0242_valid_anagram;
+mod n0112_path_sum;
+mod n0023_merge_k_sorted_lists;
+mod n0230_kth_smallest_element_in_a_bst;
+mod n0104_maximum_depth_of_binary_tree;
+mod n0258_add_digits;
+mod n0187_repeated_dna_sequences;
+mod n0025_reverse_nodes_in_k_group;
+mod n0039_combination_sum;
+mod n0107_binary_tree_level_order_traversal_ii;
+mod n0091_decode_ways;
 mod n0056_merge_intervals;
-mod n0057_insert_interval;
-mod n0058_length_of_last_word;
-mod n0059_spiral_matrix_ii;
-mod n0060_permutation_sequence;
-mod n0061_rotate_list;
-mod n0062_unique_paths;
-mod n0063_unique_paths_ii;
-mod n0064_minimum_path_sum;
 mod n0065_valid_number;
-mod n0066_plus_one;
-mod n0067_add_binary;
-mod n0068_text_justification;
-mod n0069_sqrtx;
-mod n0070_climbing_stairs;
-mod n0071_simplify_path;
+mod n0016_3sum_closest;
+mod n0096_unique_binary_search_trees;
 mod n0072_edit_distance;
+mod n0044_wildcard_matching;
+mod n0239_sliding_window_maximum;
+mod n0174_dungeon_game;
 mod n0073_set_matrix_zeroes;
-mod n0074_search_a_2d_matrix;
-mod n0075_sort_colors;
-mod n0076_minimum_window_substring;
-mod n0077_combinations;
 mod n0078_subsets;
-mod n0079_word_search;
-mod n0080_remove_duplicates_from_sorted_array_ii;
-mod n0081_search_in_rotated_sorted_array_ii;
-mod n0082_remove_duplicates_from_sorted_list_ii;
-mod n0083_remove_duplicates_from_sorted_list;
-mod n0084_largest_rectangle_in_histogram;
-mod n0085_maximal_rectangle;
-mod n0086_partition_list;
-mod n0087_scramble_string;
-mod n0088_merge_sorted_array;
-mod n0089_gray_code;
-mod n0090_subsets_ii;
-mod n0091_decode_ways;
-mod n0092_reverse_linked_list_ii;
-mod n0093_restore_ip_addresses;
-mod n0094_binary_tree_inorder_traversal;
-mod n0095_unique_binary_search_trees_ii;
-mod n0096_unique_binary_search_trees;
+mod n0037_sudoku_solver;
+mod n0033_search_in_rotated_sorted_array;
+mod n0002_add_two_numbers;
+mod n0313_super_ugly_number;
+mod n0068_text_justification;
+mod n0064_minimum_path_sum;
+mod n0218_the_skyline_problem;
+mod n0125_valid_palindrome;
+mod n0210_course_schedule_ii;
+mod n0143_reorder_list;
+mod n0164_maximum_gap;
 mod n0097_interleaving_string;
-mod n0098_validate_binary_search_tree;
-mod n0099_recover_binary_search_tree;
-mod n0100_same_tree;
-mod n0101_symmetric_tree;
-mod n0102_binary_tree_level_order_traversal;
-mod n0103_binary_tree_zigzag_level_order_traversal;
-mod n0104_maximum_depth_of_binary_tree;
 mod n0105_construct_binary_tree_from_preorder_and_inorder_traversal;
-mod n0106_construct_binary_tree_from_inorder_and_postorder_traversal;
-mod n0107_binary_tree_level_order_traversal_ii;
-mod n0108_convert_sorted_array_to_binary_search_tree;
-mod n0109_convert_sorted_list_to_binary_search_tree;
-mod n0110_balanced_binary_tree;
-mod n0111_minimum_depth_of_binary_tree;
-mod n0112_path_sum;
-mod n0113_path_sum_ii;
-mod n0114_flatten_binary_tree_to_linked_list;
-mod n0115_distinct_subsequences;
-mod n0118_pascals_triangle;
-mod n0119_pascals_triangle_ii;
-mod n0120_triangle;
+mod n0167_two_sum_ii_input_array_is_sorted;
+mod n0034_find_first_and_last_position_of_element_in_sorted_array;
+mod n0094_binary_tree_inorder_traversal;
+mod n0052_n_queens_ii;
 mod n0121_best_time_to_buy_and_sell_stock;
-mod n0122_best_time_to_buy_and_sell_stock_ii;
-mod n0123_best_time_to_buy_and_sell_stock_iii;
-mod n0124_binary_tree_maximum_path_sum;
-mod n0125_valid_palindrome;
-mod n0126_word_ladder_ii;
-mod n0127_word_ladder;
-mod n0128_longest_consecutive_sequence;
-mod n0129_sum_root_to_leaf_numbers;
-mod n0130_surrounded_regions;
-mod n0131_palindrome_partitioning;
-mod n0132_palindrome_partitioning_ii;
-mod n0134_gas_station;
+mod n0273_integer_to_english_words;
+mod n0225_implement_stack_using_queues;
+mod n0046_permutations;
+mod n0085_maximal_rectangle;
 mod n0135_candy;
-mod n0136_single_number;
-mod n0137_single_number_ii;
-mod n0139_word_break;
+mod n0113_path_sum_ii;
+mod n0029_divide_two_integers;
+mod n0260_single_number_iii;
 mod n0140_word_break_ii;
-mod n0143_reorder_list;
-mod n0144_binary_tree_preorder_traversal;
-mod n0145_binary_tree_postorder_traversal;
-mod n0146_lru_cache;
-mod n0147_insertion_sort_list;
-mod n0148_sort_list;
 mod n0149_max_points_on_a_line;
-mod n0150_evaluate_reverse_polish_notation;
-mod n0151_reverse_words_in_a_string;
-mod n0152_maximum_product_subarray;
-mod n0153_find_minimum_in_rotated_sorted_array;
-mod n0154_find_minimum_in_rotated_sorted_array_ii;
-mod n0155_min_stack;
-mod n0162_find_peak_element;
-mod n0164_maximum_gap;
-mod n0165_compare_version_numbers;
-mod n0166_fraction_to_recurring_decimal;
-mod n0167_two_sum_ii_input_array_is_sorted;
-mod n0168_excel_sheet_column_title;
-mod n0169_majority_element;
-mod n0171_excel_sheet_column_number;
-mod n0172_factorial_trailing_zeroes;
+mod n0213_house_robber_ii;
+mod n0222_count_complete_tree_nodes;
+mod n0134_gas_station;
+mod n0057_insert_interval;
 mod n0173_binary_search_tree_iterator;
-mod n0174_dungeon_game;
-mod n0179_largest_number;
-mod n0187_repeated_dna_sequences;
-mod n0188_best_time_to_buy_and_sell_stock_iv;
+mod n0077_combinations;
+mod n0005_longest_palindromic_substring;
+mod n0041_first_missing_positive;
+mod n0026_remove_duplicates_from_sorted_array;
+mod n0166_fraction_to_recurring_decimal;
+mod n0119_pascals_triangle_ii;
+mod n0012_integer_to_roman;
+mod n0223_rectangle_area;
+mod n0229_majority_element_ii;
+mod n0061_rotate_list;
+mod n0123_best_time_to_buy_and_sell_stock_iii;
+mod n0301_remove_invalid_parentheses;
+mod n0067_add_binary;
+mod n0049_group_anagrams;
 mod n0189_rotate_array;
-mod n0198_house_robber;
-mod n0199_binary_tree_right_side_view;
-mod n0200_number_of_islands;
-mod n0201_bitwise_and_of_numbers_range;
-mod n0202_happy_number;
-mod n0203_remove_linked_list_elements;
-mod n0204_count_primes;
-mod n0205_isomorphic_strings;
-mod n0206_reverse_linked_list;
-mod n0207_course_schedule;
+mod n0001_two_sum;
+mod n0275_h_index_ii;
+mod n0103_binary_tree_zigzag_level_order_traversal;
+mod n0137_single_number_ii;
 mod n0208_implement_trie_prefix_tree;
+mod n0300_longest_increasing_subsequence;
+mod n0118_pascals_triangle;
+mod n0010_regular_expression_matching;
+mod n0013_roman_to_integer;
 mod n0209_minimum_size_subarray_sum;
-mod n0210_course_schedule_ii;
-mod n0211_add_and_search_word_data_structure_design;
-mod n0212_word_search_ii;
-mod n0213_house_robber_ii;
-mod n0214_shortest_palindrome;
-mod n0215_kth_largest_element_in_an_array;
-mod n0216_combination_sum_iii;
-mod n0217_contains_duplicate;
-mod n0218_the_skyline_problem;
-mod n0219_contains_duplicate_ii;
-mod n0220_contains_duplicate_iii;
-mod n0221_maximal_square;
-mod n0222_count_complete_tree_nodes;
-mod n0223_rectangle_area;
-mod n0224_basic_calculator;
-mod n0225_implement_stack_using_queues;
-mod n0226_invert_binary_tree;
 mod n0227_basic_calculator_ii;
-mod n0228_summary_ranges;
-mod n0229_majority_element_ii;
-mod n0230_kth_smallest_element_in_a_bst;
-mod n0231_power_of_two;
-mod n0232_implement_queue_using_stacks;
+mod n0022_generate_parentheses;
+mod n0008_string_to_integer_atoi;
+mod n0152_maximum_product_subarray;
+mod n0014_longest_common_prefix;
+mod n0070_climbing_stairs;
 mod n0233_number_of_digit_one;
-mod n0238_product_of_array_except_self;
-mod n0239_sliding_window_maximum;
-mod n0241_different_ways_to_add_parentheses;
-mod n0242_valid_anagram;
-mod n0257_binary_tree_paths;
-mod n0258_add_digits;
-mod n0260_single_number_iii;
+mod n0154_find_minimum_in_rotated_sorted_array_ii;
+mod n0127_word_ladder;
+mod n0207_course_schedule;
 mod n0263_ugly_number;
-mod n0264_ugly_number_ii;
-mod n0268_missing_number;
-mod n0273_integer_to_english_words;
-mod n0274_h_index;
-mod n0275_h_index_ii;
-mod n0279_perfect_squares;
-mod n0282_expression_add_operators;
-mod n0283_move_zeroes;
+mod n0295_find_median_from_data_stream;
+mod n0148_sort_list;
+mod n0257_binary_tree_paths;
+mod n0120_triangle;
+mod n0309_best_time_to_buy_and_sell_stock_with_cooldown;
+mod n0074_search_a_2d_matrix;
+mod n0215_kth_largest_element_in_an_array;
+mod n0203_remove_linked_list_elements;
+mod n0081_search_in_rotated_sorted_array_ii;
+mod n0059_spiral_matrix_ii;
+mod n0151_reverse_words_in_a_string;
+mod n0205_isomorphic_strings;
+mod n0179_largest_number;
+mod n0168_excel_sheet_column_title;
+mod n0007_reverse_integer;
+mod n0032_longest_valid_parentheses;
+mod n0165_compare_version_numbers;
+mod n0031_next_permutation;
+mod n0088_merge_sorted_array;
+mod n0509_fibonacci_number;
+mod n0036_valid_sudoku;
+mod n0069_sqrtx;
+mod n0211_add_and_search_word_data_structure_design;
+mod n0114_flatten_binary_tree_to_linked_list;
+mod n0224_basic_calculator;
+mod n0045_jump_game_ii;
+mod n0051_n_queens;
+mod n0212_word_search_ii;
 mod n0287_find_the_duplicate_number;
+mod n0153_find_minimum_in_rotated_sorted_array;
 mod n0289_game_of_life;
-mod n0290_word_pattern;
-mod n0292_nim_game;
-mod n0295_find_median_from_data_stream;
-mod n0299_bulls_and_cows;
-mod n0300_longest_increasing_subsequence;
-mod n0301_remove_invalid_parentheses;
-mod n0303_range_sum_query_immutable;
-mod n0304_range_sum_query_2d_immutable;
-mod n0306_additive_number;
+mod n0200_number_of_islands;
+mod n0015_3sum;
+mod n0216_combination_sum_iii;
+mod n0043_multiply_strings;
+mod n0090_subsets_ii;
+mod n0003_longest_substring;
+mod n0139_word_break;
+mod n0150_evaluate_reverse_polish_notation;
+mod n0063_unique_paths_ii;
+mod n0062_unique_paths;
+mod n0199_binary_tree_right_side_view;
+mod n0282_expression_add_operators;
+mod n0021_merge_two_sorted_lists;
+mod n0129_sum_root_to_leaf_numbers;
+mod n0206_reverse_linked_list;
+mod n0131_palindrome_partitioning;
 mod n0307_range_sum_query_mutable;
-mod n0309_best_time_to_buy_and_sell_stock_with_cooldown;
-mod n0310_minimum_height_trees;
-mod n0312_burst_balloons;
-mod n0313_super_ugly_number;
-mod n0792_binary_search;
-mod n1009_pancake_sorting;
-mod n1013_fibonacci_number;
-mod n1071_binary_prefix_divisible_by_5;
-mod n1127_last_stone_weight;
+mod n0111_minimum_depth_of_binary_tree;
+mod n0092_reverse_linked_list_ii;
+mod n0303_range_sum_query_immutable;
+mod n0102_binary_tree_level_order_traversal;
diff --git a/src/n1013_fibonacci_number.rs b/src/n0509_fibonacci_number.rs
similarity index 100%
rename from src/n1013_fibonacci_number.rs
rename to src/n0509_fibonacci_number.rs
diff --git a/src/n0792_binary_search.rs b/src/n0704_binary_search.rs
similarity index 100%
rename from src/n0792_binary_search.rs
rename to src/n0704_binary_search.rs
diff --git a/src/n1009_pancake_sorting.rs b/src/n0969_pancake_sorting.rs
similarity index 100%
rename from src/n1009_pancake_sorting.rs
rename to src/n0969_pancake_sorting.rs
diff --git a/src/n1071_binary_prefix_divisible_by_5.rs b/src/n1018_binary_prefix_divisible_by_5.rs
similarity index 100%
rename from src/n1071_binary_prefix_divisible_by_5.rs
rename to src/n1018_binary_prefix_divisible_by_5.rs
diff --git a/src/n1127_last_stone_weight.rs b/src/n1046_last_stone_weight.rs
similarity index 100%
rename from src/n1127_last_stone_weight.rs
rename to src/n1046_last_stone_weight.rs
diff --git a/src/problem.rs b/src/problem.rs
index 712135a4..d4f7310f 100644
--- a/src/problem.rs
+++ b/src/problem.rs
@@ -42,7 +42,7 @@ pub fn get_problem(frontend_question_id: u32) -> Option<Problem> {
                 content: resp.data.question.content,
                 sample_test_case: resp.data.question.sample_test_case,
                 difficulty: problem.difficulty.to_string(),
-                question_id: problem.stat.question_id,
+                question_id: problem.stat.frontend_question_id,
             });
         }
     }

From d6e135c0b53bb0871f1026a76aeff8812d81498e Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Sun, 2 Feb 2020 13:14:54 +0800
Subject: [PATCH 03/47] separate problems and answers

---
 .gitignore                                    |   1 +
 src/{problem.rs => fetcher.rs}                |   0
 src/lib.rs                                    | 239 +-----------------
 src/main.rs                                   |  16 +-
 src/problem/mod.rs                            |   0
 src/solution/mod.rs                           | 237 +++++++++++++++++
 .../s0001_two_sum.rs}                         |   0
 .../s0002_add_two_numbers.rs}                 |   2 +-
 .../s0003_longest_substring.rs}               |   0
 .../s0004_median_of_two_sorted_arrays.rs}     |   0
 .../s0005_longest_palindromic_substring.rs}   |   0
 .../s0006_zigzag_conversion.rs}               |   0
 .../s0007_reverse_integer.rs}                 |   0
 .../s0008_string_to_integer_atoi.rs}          |   0
 .../s0009_palindrome_number.rs}               |   0
 .../s0010_regular_expression_matching.rs}     |   0
 .../s0011_container_with_most_water.rs}       |   0
 .../s0012_integer_to_roman.rs}                |   0
 .../s0013_roman_to_integer.rs}                |   0
 .../s0014_longest_common_prefix.rs}           |   0
 src/{n0015_3sum.rs => solution/s0015_3sum.rs} |   0
 .../s0016_3sum_closest.rs}                    |   0
 ..._letter_combinations_of_a_phone_number.rs} |   0
 src/{n0018_4sum.rs => solution/s0018_4sum.rs} |   0
 ...s0019_remove_nth_node_from_end_of_list.rs} |   2 +-
 .../s0020_valid_parentheses.rs}               |   0
 .../s0021_merge_two_sorted_lists.rs}          |   2 +-
 .../s0022_generate_parentheses.rs}            |   0
 .../s0023_merge_k_sorted_lists.rs}            |   2 +-
 .../s0024_swap_nodes_in_pairs.rs}             |   2 +-
 .../s0025_reverse_nodes_in_k_group.rs}        |   2 +-
 ...26_remove_duplicates_from_sorted_array.rs} |   0
 .../s0027_remove_element.rs}                  |   0
 .../s0028_implement_strstr.rs}                |   0
 .../s0029_divide_two_integers.rs}             |   0
 ...string_with_concatenation_of_all_words.rs} |   0
 .../s0031_next_permutation.rs}                |   0
 .../s0032_longest_valid_parentheses.rs}       |   0
 .../s0033_search_in_rotated_sorted_array.rs}  |   0
 ...st_position_of_element_in_sorted_array.rs} |   0
 .../s0035_search_insert_position.rs}          |   0
 .../s0036_valid_sudoku.rs}                    |   0
 .../s0037_sudoku_solver.rs}                   |   0
 .../s0038_count_and_say.rs}                   |   0
 .../s0039_combination_sum.rs}                 |   0
 .../s0040_combination_sum_ii.rs}              |   0
 .../s0041_first_missing_positive.rs}          |   0
 .../s0042_trapping_rain_water.rs}             |   0
 .../s0043_multiply_strings.rs}                |   0
 .../s0044_wildcard_matching.rs}               |   0
 .../s0045_jump_game_ii.rs}                    |   0
 .../s0046_permutations.rs}                    |   0
 .../s0047_permutations_ii.rs}                 |   0
 .../s0048_rotate_image.rs}                    |   0
 .../s0049_group_anagrams.rs}                  |   0
 .../s0050_powx_n.rs}                          |   0
 .../s0051_n_queens.rs}                        |   0
 .../s0052_n_queens_ii.rs}                     |   0
 .../s0053_maximum_subarray.rs}                |   0
 .../s0054_spiral_matrix.rs}                   |   0
 .../s0055_jump_game.rs}                       |   0
 .../s0056_merge_intervals.rs}                 |   0
 .../s0057_insert_interval.rs}                 |   0
 .../s0058_length_of_last_word.rs}             |   0
 .../s0059_spiral_matrix_ii.rs}                |   0
 .../s0060_permutation_sequence.rs}            |   0
 .../s0061_rotate_list.rs}                     |   2 +-
 .../s0062_unique_paths.rs}                    |   0
 .../s0063_unique_paths_ii.rs}                 |   0
 .../s0064_minimum_path_sum.rs}                |   0
 .../s0065_valid_number.rs}                    |   0
 .../s0066_plus_one.rs}                        |   0
 .../s0067_add_binary.rs}                      |   0
 .../s0068_text_justification.rs}              |   0
 .../s0069_sqrtx.rs}                           |   0
 .../s0070_climbing_stairs.rs}                 |   0
 .../s0071_simplify_path.rs}                   |   0
 .../s0072_edit_distance.rs}                   |   0
 .../s0073_set_matrix_zeroes.rs}               |   0
 .../s0074_search_a_2d_matrix.rs}              |   0
 .../s0075_sort_colors.rs}                     |   0
 .../s0076_minimum_window_substring.rs}        |   0
 .../s0077_combinations.rs}                    |   0
 .../s0078_subsets.rs}                         |   0
 .../s0079_word_search.rs}                     |   0
 ...remove_duplicates_from_sorted_array_ii.rs} |   0
 ...0081_search_in_rotated_sorted_array_ii.rs} |   0
 ..._remove_duplicates_from_sorted_list_ii.rs} |   2 +-
 ...083_remove_duplicates_from_sorted_list.rs} |   2 +-
 .../s0084_largest_rectangle_in_histogram.rs}  |   0
 .../s0085_maximal_rectangle.rs}               |   0
 .../s0086_partition_list.rs}                  |   2 +-
 .../s0087_scramble_string.rs}                 |   0
 .../s0088_merge_sorted_array.rs}              |   0
 .../s0089_gray_code.rs}                       |   0
 .../s0090_subsets_ii.rs}                      |   0
 .../s0091_decode_ways.rs}                     |   0
 .../s0092_reverse_linked_list_ii.rs}          |   2 +-
 .../s0093_restore_ip_addresses.rs}            |   0
 .../s0094_binary_tree_inorder_traversal.rs}   |   2 +-
 .../s0095_unique_binary_search_trees_ii.rs}   |   2 +-
 .../s0096_unique_binary_search_trees.rs}      |   0
 .../s0097_interleaving_string.rs}             |   0
 .../s0098_validate_binary_search_tree.rs}     |   2 +-
 .../s0099_recover_binary_search_tree.rs}      |   2 +-
 .../s0100_same_tree.rs}                       |   2 +-
 .../s0101_symmetric_tree.rs}                  |   2 +-
 ...0102_binary_tree_level_order_traversal.rs} |   2 +-
 ...nary_tree_zigzag_level_order_traversal.rs} |   2 +-
 .../s0104_maximum_depth_of_binary_tree.rs}    |   2 +-
 ...ee_from_preorder_and_inorder_traversal.rs} |   2 +-
 ...e_from_inorder_and_postorder_traversal.rs} |   2 +-
 ...7_binary_tree_level_order_traversal_ii.rs} |   2 +-
 ...ert_sorted_array_to_binary_search_tree.rs} |   2 +-
 ...vert_sorted_list_to_binary_search_tree.rs} |   4 +-
 .../s0110_balanced_binary_tree.rs}            |   2 +-
 .../s0111_minimum_depth_of_binary_tree.rs}    |   2 +-
 .../s0112_path_sum.rs}                        |   2 +-
 .../s0113_path_sum_ii.rs}                     |   2 +-
 ...114_flatten_binary_tree_to_linked_list.rs} |   2 +-
 .../s0115_distinct_subsequences.rs}           |   0
 .../s0118_pascals_triangle.rs}                |   0
 .../s0119_pascals_triangle_ii.rs}             |   0
 .../s0120_triangle.rs}                        |   0
 .../s0121_best_time_to_buy_and_sell_stock.rs} |   0
 ...122_best_time_to_buy_and_sell_stock_ii.rs} |   0
 ...23_best_time_to_buy_and_sell_stock_iii.rs} |   0
 .../s0124_binary_tree_maximum_path_sum.rs}    |   2 +-
 .../s0125_valid_palindrome.rs}                |   0
 .../s0126_word_ladder_ii.rs}                  |   0
 .../s0127_word_ladder.rs}                     |   0
 .../s0128_longest_consecutive_sequence.rs}    |   0
 .../s0129_sum_root_to_leaf_numbers.rs}        |   2 +-
 .../s0130_surrounded_regions.rs}              |   0
 .../s0131_palindrome_partitioning.rs}         |   0
 .../s0132_palindrome_partitioning_ii.rs}      |   0
 .../s0134_gas_station.rs}                     |   0
 .../s0135_candy.rs}                           |   0
 .../s0136_single_number.rs}                   |   0
 .../s0137_single_number_ii.rs}                |   0
 .../s0139_word_break.rs}                      |   0
 .../s0140_word_break_ii.rs}                   |   0
 .../s0143_reorder_list.rs}                    |   2 +-
 .../s0144_binary_tree_preorder_traversal.rs}  |   2 +-
 .../s0145_binary_tree_postorder_traversal.rs} |   2 +-
 .../s0146_lru_cache.rs}                       |   0
 .../s0147_insertion_sort_list.rs}             |   4 +-
 .../s0148_sort_list.rs}                       |   2 +-
 .../s0149_max_points_on_a_line.rs}            |   4 +-
 ...s0150_evaluate_reverse_polish_notation.rs} |   0
 .../s0151_reverse_words_in_a_string.rs}       |   0
 .../s0152_maximum_product_subarray.rs}        |   0
 ...3_find_minimum_in_rotated_sorted_array.rs} |   0
 ...ind_minimum_in_rotated_sorted_array_ii.rs} |   0
 .../s0155_min_stack.rs}                       |   0
 .../s0162_find_peak_element.rs}               |   0
 .../s0164_maximum_gap.rs}                     |   0
 .../s0165_compare_version_numbers.rs}         |   0
 .../s0166_fraction_to_recurring_decimal.rs}   |   0
 ...s0167_two_sum_ii_input_array_is_sorted.rs} |   0
 .../s0168_excel_sheet_column_title.rs}        |   0
 .../s0169_majority_element.rs}                |   0
 .../s0171_excel_sheet_column_number.rs}       |   0
 .../s0172_factorial_trailing_zeroes.rs}       |   0
 .../s0173_binary_search_tree_iterator.rs}     |   6 +-
 .../s0174_dungeon_game.rs}                    |   0
 .../s0179_largest_number.rs}                  |   0
 .../s0187_repeated_dna_sequences.rs}          |   0
 ...188_best_time_to_buy_and_sell_stock_iv.rs} |   0
 .../s0189_rotate_array.rs}                    |   0
 .../s0198_house_robber.rs}                    |   0
 .../s0199_binary_tree_right_side_view.rs}     |   2 +-
 .../s0200_number_of_islands.rs}               |   0
 .../s0201_bitwise_and_of_numbers_range.rs}    |   0
 .../s0202_happy_number.rs}                    |   0
 .../s0203_remove_linked_list_elements.rs}     |   2 +-
 .../s0204_count_primes.rs}                    |   0
 .../s0205_isomorphic_strings.rs}              |   0
 .../s0206_reverse_linked_list.rs}             |   2 +-
 .../s0207_course_schedule.rs}                 |   0
 .../s0208_implement_trie_prefix_tree.rs}      |   0
 .../s0209_minimum_size_subarray_sum.rs}       |   0
 .../s0210_course_schedule_ii.rs}              |   0
 ..._and_search_word_data_structure_design.rs} |   0
 .../s0212_word_search_ii.rs}                  |   0
 .../s0213_house_robber_ii.rs}                 |   0
 .../s0214_shortest_palindrome.rs}             |   0
 .../s0215_kth_largest_element_in_an_array.rs} |   0
 .../s0216_combination_sum_iii.rs}             |   0
 .../s0217_contains_duplicate.rs}              |   0
 .../s0218_the_skyline_problem.rs}             |   0
 .../s0219_contains_duplicate_ii.rs}           |   0
 .../s0220_contains_duplicate_iii.rs}          |   0
 .../s0221_maximal_square.rs}                  |   0
 .../s0222_count_complete_tree_nodes.rs}       |   2 +-
 .../s0223_rectangle_area.rs}                  |   0
 .../s0224_basic_calculator.rs}                |   0
 .../s0225_implement_stack_using_queues.rs}    |   0
 .../s0226_invert_binary_tree.rs}              |   2 +-
 .../s0227_basic_calculator_ii.rs}             |   0
 .../s0228_summary_ranges.rs}                  |   0
 .../s0229_majority_element_ii.rs}             |   0
 .../s0230_kth_smallest_element_in_a_bst.rs}   |   2 +-
 .../s0231_power_of_two.rs}                    |   0
 .../s0232_implement_queue_using_stacks.rs}    |   0
 .../s0233_number_of_digit_one.rs}             |   0
 .../s0238_product_of_array_except_self.rs}    |   0
 .../s0239_sliding_window_maximum.rs}          |   0
 ...0241_different_ways_to_add_parentheses.rs} |   0
 .../s0242_valid_anagram.rs}                   |   0
 .../s0257_binary_tree_paths.rs}               |   2 +-
 .../s0258_add_digits.rs}                      |   0
 .../s0260_single_number_iii.rs}               |   0
 .../s0263_ugly_number.rs}                     |   0
 .../s0264_ugly_number_ii.rs}                  |   0
 .../s0268_missing_number.rs}                  |   0
 .../s0273_integer_to_english_words.rs}        |   0
 .../s0274_h_index.rs}                         |   0
 .../s0275_h_index_ii.rs}                      |   0
 .../s0279_perfect_squares.rs}                 |   0
 .../s0282_expression_add_operators.rs}        |   0
 .../s0283_move_zeroes.rs}                     |   0
 .../s0287_find_the_duplicate_number.rs}       |   0
 .../s0289_game_of_life.rs}                    |   0
 .../s0290_word_pattern.rs}                    |   0
 .../s0292_nim_game.rs}                        |   0
 .../s0295_find_median_from_data_stream.rs}    |   0
 .../s0299_bulls_and_cows.rs}                  |   0
 .../s0300_longest_increasing_subsequence.rs}  |   0
 .../s0301_remove_invalid_parentheses.rs}      |   0
 .../s0303_range_sum_query_immutable.rs}       |   0
 .../s0304_range_sum_query_2d_immutable.rs}    |   0
 .../s0306_additive_number.rs}                 |   0
 .../s0307_range_sum_query_mutable.rs}         |   0
 ...me_to_buy_and_sell_stock_with_cooldown.rs} |   0
 .../s0310_minimum_height_trees.rs}            |   0
 .../s0312_burst_balloons.rs}                  |   0
 .../s0313_super_ugly_number.rs}               |   0
 .../s0509_fibonacci_number.rs}                |   0
 .../s0704_binary_search.rs}                   |   0
 .../s0969_pancake_sorting.rs}                 |   0
 .../s1018_binary_prefix_divisible_by_5.rs}    |   0
 .../s1046_last_stone_weight.rs}               |   0
 243 files changed, 299 insertions(+), 296 deletions(-)
 rename src/{problem.rs => fetcher.rs} (100%)
 create mode 100644 src/problem/mod.rs
 create mode 100644 src/solution/mod.rs
 rename src/{n0001_two_sum.rs => solution/s0001_two_sum.rs} (100%)
 rename src/{n0002_add_two_numbers.rs => solution/s0002_add_two_numbers.rs} (98%)
 rename src/{n0003_longest_substring.rs => solution/s0003_longest_substring.rs} (100%)
 rename src/{n0004_median_of_two_sorted_arrays.rs => solution/s0004_median_of_two_sorted_arrays.rs} (100%)
 rename src/{n0005_longest_palindromic_substring.rs => solution/s0005_longest_palindromic_substring.rs} (100%)
 rename src/{n0006_zigzag_conversion.rs => solution/s0006_zigzag_conversion.rs} (100%)
 rename src/{n0007_reverse_integer.rs => solution/s0007_reverse_integer.rs} (100%)
 rename src/{n0008_string_to_integer_atoi.rs => solution/s0008_string_to_integer_atoi.rs} (100%)
 rename src/{n0009_palindrome_number.rs => solution/s0009_palindrome_number.rs} (100%)
 rename src/{n0010_regular_expression_matching.rs => solution/s0010_regular_expression_matching.rs} (100%)
 rename src/{n0011_container_with_most_water.rs => solution/s0011_container_with_most_water.rs} (100%)
 rename src/{n0012_integer_to_roman.rs => solution/s0012_integer_to_roman.rs} (100%)
 rename src/{n0013_roman_to_integer.rs => solution/s0013_roman_to_integer.rs} (100%)
 rename src/{n0014_longest_common_prefix.rs => solution/s0014_longest_common_prefix.rs} (100%)
 rename src/{n0015_3sum.rs => solution/s0015_3sum.rs} (100%)
 rename src/{n0016_3sum_closest.rs => solution/s0016_3sum_closest.rs} (100%)
 rename src/{n0017_letter_combinations_of_a_phone_number.rs => solution/s0017_letter_combinations_of_a_phone_number.rs} (100%)
 rename src/{n0018_4sum.rs => solution/s0018_4sum.rs} (100%)
 rename src/{n0019_remove_nth_node_from_end_of_list.rs => solution/s0019_remove_nth_node_from_end_of_list.rs} (97%)
 rename src/{n0020_valid_parentheses.rs => solution/s0020_valid_parentheses.rs} (100%)
 rename src/{n0021_merge_two_sorted_lists.rs => solution/s0021_merge_two_sorted_lists.rs} (97%)
 rename src/{n0022_generate_parentheses.rs => solution/s0022_generate_parentheses.rs} (100%)
 rename src/{n0023_merge_k_sorted_lists.rs => solution/s0023_merge_k_sorted_lists.rs} (97%)
 rename src/{n0024_swap_nodes_in_pairs.rs => solution/s0024_swap_nodes_in_pairs.rs} (97%)
 rename src/{n0025_reverse_nodes_in_k_group.rs => solution/s0025_reverse_nodes_in_k_group.rs} (98%)
 rename src/{n0026_remove_duplicates_from_sorted_array.rs => solution/s0026_remove_duplicates_from_sorted_array.rs} (100%)
 rename src/{n0027_remove_element.rs => solution/s0027_remove_element.rs} (100%)
 rename src/{n0028_implement_strstr.rs => solution/s0028_implement_strstr.rs} (100%)
 rename src/{n0029_divide_two_integers.rs => solution/s0029_divide_two_integers.rs} (100%)
 rename src/{n0030_substring_with_concatenation_of_all_words.rs => solution/s0030_substring_with_concatenation_of_all_words.rs} (100%)
 rename src/{n0031_next_permutation.rs => solution/s0031_next_permutation.rs} (100%)
 rename src/{n0032_longest_valid_parentheses.rs => solution/s0032_longest_valid_parentheses.rs} (100%)
 rename src/{n0033_search_in_rotated_sorted_array.rs => solution/s0033_search_in_rotated_sorted_array.rs} (100%)
 rename src/{n0034_find_first_and_last_position_of_element_in_sorted_array.rs => solution/s0034_find_first_and_last_position_of_element_in_sorted_array.rs} (100%)
 rename src/{n0035_search_insert_position.rs => solution/s0035_search_insert_position.rs} (100%)
 rename src/{n0036_valid_sudoku.rs => solution/s0036_valid_sudoku.rs} (100%)
 rename src/{n0037_sudoku_solver.rs => solution/s0037_sudoku_solver.rs} (100%)
 rename src/{n0038_count_and_say.rs => solution/s0038_count_and_say.rs} (100%)
 rename src/{n0039_combination_sum.rs => solution/s0039_combination_sum.rs} (100%)
 rename src/{n0040_combination_sum_ii.rs => solution/s0040_combination_sum_ii.rs} (100%)
 rename src/{n0041_first_missing_positive.rs => solution/s0041_first_missing_positive.rs} (100%)
 rename src/{n0042_trapping_rain_water.rs => solution/s0042_trapping_rain_water.rs} (100%)
 rename src/{n0043_multiply_strings.rs => solution/s0043_multiply_strings.rs} (100%)
 rename src/{n0044_wildcard_matching.rs => solution/s0044_wildcard_matching.rs} (100%)
 rename src/{n0045_jump_game_ii.rs => solution/s0045_jump_game_ii.rs} (100%)
 rename src/{n0046_permutations.rs => solution/s0046_permutations.rs} (100%)
 rename src/{n0047_permutations_ii.rs => solution/s0047_permutations_ii.rs} (100%)
 rename src/{n0048_rotate_image.rs => solution/s0048_rotate_image.rs} (100%)
 rename src/{n0049_group_anagrams.rs => solution/s0049_group_anagrams.rs} (100%)
 rename src/{n0050_powx_n.rs => solution/s0050_powx_n.rs} (100%)
 rename src/{n0051_n_queens.rs => solution/s0051_n_queens.rs} (100%)
 rename src/{n0052_n_queens_ii.rs => solution/s0052_n_queens_ii.rs} (100%)
 rename src/{n0053_maximum_subarray.rs => solution/s0053_maximum_subarray.rs} (100%)
 rename src/{n0054_spiral_matrix.rs => solution/s0054_spiral_matrix.rs} (100%)
 rename src/{n0055_jump_game.rs => solution/s0055_jump_game.rs} (100%)
 rename src/{n0056_merge_intervals.rs => solution/s0056_merge_intervals.rs} (100%)
 rename src/{n0057_insert_interval.rs => solution/s0057_insert_interval.rs} (100%)
 rename src/{n0058_length_of_last_word.rs => solution/s0058_length_of_last_word.rs} (100%)
 rename src/{n0059_spiral_matrix_ii.rs => solution/s0059_spiral_matrix_ii.rs} (100%)
 rename src/{n0060_permutation_sequence.rs => solution/s0060_permutation_sequence.rs} (100%)
 rename src/{n0061_rotate_list.rs => solution/s0061_rotate_list.rs} (94%)
 rename src/{n0062_unique_paths.rs => solution/s0062_unique_paths.rs} (100%)
 rename src/{n0063_unique_paths_ii.rs => solution/s0063_unique_paths_ii.rs} (100%)
 rename src/{n0064_minimum_path_sum.rs => solution/s0064_minimum_path_sum.rs} (100%)
 rename src/{n0065_valid_number.rs => solution/s0065_valid_number.rs} (100%)
 rename src/{n0066_plus_one.rs => solution/s0066_plus_one.rs} (100%)
 rename src/{n0067_add_binary.rs => solution/s0067_add_binary.rs} (100%)
 rename src/{n0068_text_justification.rs => solution/s0068_text_justification.rs} (100%)
 rename src/{n0069_sqrtx.rs => solution/s0069_sqrtx.rs} (100%)
 rename src/{n0070_climbing_stairs.rs => solution/s0070_climbing_stairs.rs} (100%)
 rename src/{n0071_simplify_path.rs => solution/s0071_simplify_path.rs} (100%)
 rename src/{n0072_edit_distance.rs => solution/s0072_edit_distance.rs} (100%)
 rename src/{n0073_set_matrix_zeroes.rs => solution/s0073_set_matrix_zeroes.rs} (100%)
 rename src/{n0074_search_a_2d_matrix.rs => solution/s0074_search_a_2d_matrix.rs} (100%)
 rename src/{n0075_sort_colors.rs => solution/s0075_sort_colors.rs} (100%)
 rename src/{n0076_minimum_window_substring.rs => solution/s0076_minimum_window_substring.rs} (100%)
 rename src/{n0077_combinations.rs => solution/s0077_combinations.rs} (100%)
 rename src/{n0078_subsets.rs => solution/s0078_subsets.rs} (100%)
 rename src/{n0079_word_search.rs => solution/s0079_word_search.rs} (100%)
 rename src/{n0080_remove_duplicates_from_sorted_array_ii.rs => solution/s0080_remove_duplicates_from_sorted_array_ii.rs} (100%)
 rename src/{n0081_search_in_rotated_sorted_array_ii.rs => solution/s0081_search_in_rotated_sorted_array_ii.rs} (100%)
 rename src/{n0082_remove_duplicates_from_sorted_list_ii.rs => solution/s0082_remove_duplicates_from_sorted_list_ii.rs} (94%)
 rename src/{n0083_remove_duplicates_from_sorted_list.rs => solution/s0083_remove_duplicates_from_sorted_list.rs} (94%)
 rename src/{n0084_largest_rectangle_in_histogram.rs => solution/s0084_largest_rectangle_in_histogram.rs} (100%)
 rename src/{n0085_maximal_rectangle.rs => solution/s0085_maximal_rectangle.rs} (100%)
 rename src/{n0086_partition_list.rs => solution/s0086_partition_list.rs} (97%)
 rename src/{n0087_scramble_string.rs => solution/s0087_scramble_string.rs} (100%)
 rename src/{n0088_merge_sorted_array.rs => solution/s0088_merge_sorted_array.rs} (100%)
 rename src/{n0089_gray_code.rs => solution/s0089_gray_code.rs} (100%)
 rename src/{n0090_subsets_ii.rs => solution/s0090_subsets_ii.rs} (100%)
 rename src/{n0091_decode_ways.rs => solution/s0091_decode_ways.rs} (100%)
 rename src/{n0092_reverse_linked_list_ii.rs => solution/s0092_reverse_linked_list_ii.rs} (94%)
 rename src/{n0093_restore_ip_addresses.rs => solution/s0093_restore_ip_addresses.rs} (100%)
 rename src/{n0094_binary_tree_inorder_traversal.rs => solution/s0094_binary_tree_inorder_traversal.rs} (96%)
 rename src/{n0095_unique_binary_search_trees_ii.rs => solution/s0095_unique_binary_search_trees_ii.rs} (97%)
 rename src/{n0096_unique_binary_search_trees.rs => solution/s0096_unique_binary_search_trees.rs} (100%)
 rename src/{n0097_interleaving_string.rs => solution/s0097_interleaving_string.rs} (100%)
 rename src/{n0098_validate_binary_search_tree.rs => solution/s0098_validate_binary_search_tree.rs} (98%)
 rename src/{n0099_recover_binary_search_tree.rs => solution/s0099_recover_binary_search_tree.rs} (95%)
 rename src/{n0100_same_tree.rs => solution/s0100_same_tree.rs} (96%)
 rename src/{n0101_symmetric_tree.rs => solution/s0101_symmetric_tree.rs} (97%)
 rename src/{n0102_binary_tree_level_order_traversal.rs => solution/s0102_binary_tree_level_order_traversal.rs} (97%)
 rename src/{n0103_binary_tree_zigzag_level_order_traversal.rs => solution/s0103_binary_tree_zigzag_level_order_traversal.rs} (97%)
 rename src/{n0104_maximum_depth_of_binary_tree.rs => solution/s0104_maximum_depth_of_binary_tree.rs} (96%)
 rename src/{n0105_construct_binary_tree_from_preorder_and_inorder_traversal.rs => solution/s0105_construct_binary_tree_from_preorder_and_inorder_traversal.rs} (97%)
 rename src/{n0106_construct_binary_tree_from_inorder_and_postorder_traversal.rs => solution/s0106_construct_binary_tree_from_inorder_and_postorder_traversal.rs} (97%)
 rename src/{n0107_binary_tree_level_order_traversal_ii.rs => solution/s0107_binary_tree_level_order_traversal_ii.rs} (97%)
 rename src/{n0108_convert_sorted_array_to_binary_search_tree.rs => solution/s0108_convert_sorted_array_to_binary_search_tree.rs} (97%)
 rename src/{n0109_convert_sorted_list_to_binary_search_tree.rs => solution/s0109_convert_sorted_list_to_binary_search_tree.rs} (94%)
 rename src/{n0110_balanced_binary_tree.rs => solution/s0110_balanced_binary_tree.rs} (93%)
 rename src/{n0111_minimum_depth_of_binary_tree.rs => solution/s0111_minimum_depth_of_binary_tree.rs} (96%)
 rename src/{n0112_path_sum.rs => solution/s0112_path_sum.rs} (97%)
 rename src/{n0113_path_sum_ii.rs => solution/s0113_path_sum_ii.rs} (97%)
 rename src/{n0114_flatten_binary_tree_to_linked_list.rs => solution/s0114_flatten_binary_tree_to_linked_list.rs} (97%)
 rename src/{n0115_distinct_subsequences.rs => solution/s0115_distinct_subsequences.rs} (100%)
 rename src/{n0118_pascals_triangle.rs => solution/s0118_pascals_triangle.rs} (100%)
 rename src/{n0119_pascals_triangle_ii.rs => solution/s0119_pascals_triangle_ii.rs} (100%)
 rename src/{n0120_triangle.rs => solution/s0120_triangle.rs} (100%)
 rename src/{n0121_best_time_to_buy_and_sell_stock.rs => solution/s0121_best_time_to_buy_and_sell_stock.rs} (100%)
 rename src/{n0122_best_time_to_buy_and_sell_stock_ii.rs => solution/s0122_best_time_to_buy_and_sell_stock_ii.rs} (100%)
 rename src/{n0123_best_time_to_buy_and_sell_stock_iii.rs => solution/s0123_best_time_to_buy_and_sell_stock_iii.rs} (100%)
 rename src/{n0124_binary_tree_maximum_path_sum.rs => solution/s0124_binary_tree_maximum_path_sum.rs} (98%)
 rename src/{n0125_valid_palindrome.rs => solution/s0125_valid_palindrome.rs} (100%)
 rename src/{n0126_word_ladder_ii.rs => solution/s0126_word_ladder_ii.rs} (100%)
 rename src/{n0127_word_ladder.rs => solution/s0127_word_ladder.rs} (100%)
 rename src/{n0128_longest_consecutive_sequence.rs => solution/s0128_longest_consecutive_sequence.rs} (100%)
 rename src/{n0129_sum_root_to_leaf_numbers.rs => solution/s0129_sum_root_to_leaf_numbers.rs} (97%)
 rename src/{n0130_surrounded_regions.rs => solution/s0130_surrounded_regions.rs} (100%)
 rename src/{n0131_palindrome_partitioning.rs => solution/s0131_palindrome_partitioning.rs} (100%)
 rename src/{n0132_palindrome_partitioning_ii.rs => solution/s0132_palindrome_partitioning_ii.rs} (100%)
 rename src/{n0134_gas_station.rs => solution/s0134_gas_station.rs} (100%)
 rename src/{n0135_candy.rs => solution/s0135_candy.rs} (100%)
 rename src/{n0136_single_number.rs => solution/s0136_single_number.rs} (100%)
 rename src/{n0137_single_number_ii.rs => solution/s0137_single_number_ii.rs} (100%)
 rename src/{n0139_word_break.rs => solution/s0139_word_break.rs} (100%)
 rename src/{n0140_word_break_ii.rs => solution/s0140_word_break_ii.rs} (100%)
 rename src/{n0143_reorder_list.rs => solution/s0143_reorder_list.rs} (93%)
 rename src/{n0144_binary_tree_preorder_traversal.rs => solution/s0144_binary_tree_preorder_traversal.rs} (96%)
 rename src/{n0145_binary_tree_postorder_traversal.rs => solution/s0145_binary_tree_postorder_traversal.rs} (96%)
 rename src/{n0146_lru_cache.rs => solution/s0146_lru_cache.rs} (100%)
 rename src/{n0147_insertion_sort_list.rs => solution/s0147_insertion_sort_list.rs} (96%)
 rename src/{n0148_sort_list.rs => solution/s0148_sort_list.rs} (98%)
 rename src/{n0149_max_points_on_a_line.rs => solution/s0149_max_points_on_a_line.rs} (95%)
 rename src/{n0150_evaluate_reverse_polish_notation.rs => solution/s0150_evaluate_reverse_polish_notation.rs} (100%)
 rename src/{n0151_reverse_words_in_a_string.rs => solution/s0151_reverse_words_in_a_string.rs} (100%)
 rename src/{n0152_maximum_product_subarray.rs => solution/s0152_maximum_product_subarray.rs} (100%)
 rename src/{n0153_find_minimum_in_rotated_sorted_array.rs => solution/s0153_find_minimum_in_rotated_sorted_array.rs} (100%)
 rename src/{n0154_find_minimum_in_rotated_sorted_array_ii.rs => solution/s0154_find_minimum_in_rotated_sorted_array_ii.rs} (100%)
 rename src/{n0155_min_stack.rs => solution/s0155_min_stack.rs} (100%)
 rename src/{n0162_find_peak_element.rs => solution/s0162_find_peak_element.rs} (100%)
 rename src/{n0164_maximum_gap.rs => solution/s0164_maximum_gap.rs} (100%)
 rename src/{n0165_compare_version_numbers.rs => solution/s0165_compare_version_numbers.rs} (100%)
 rename src/{n0166_fraction_to_recurring_decimal.rs => solution/s0166_fraction_to_recurring_decimal.rs} (100%)
 rename src/{n0167_two_sum_ii_input_array_is_sorted.rs => solution/s0167_two_sum_ii_input_array_is_sorted.rs} (100%)
 rename src/{n0168_excel_sheet_column_title.rs => solution/s0168_excel_sheet_column_title.rs} (100%)
 rename src/{n0169_majority_element.rs => solution/s0169_majority_element.rs} (100%)
 rename src/{n0171_excel_sheet_column_number.rs => solution/s0171_excel_sheet_column_number.rs} (100%)
 rename src/{n0172_factorial_trailing_zeroes.rs => solution/s0172_factorial_trailing_zeroes.rs} (100%)
 rename src/{n0173_binary_search_tree_iterator.rs => solution/s0173_binary_search_tree_iterator.rs} (94%)
 rename src/{n0174_dungeon_game.rs => solution/s0174_dungeon_game.rs} (100%)
 rename src/{n0179_largest_number.rs => solution/s0179_largest_number.rs} (100%)
 rename src/{n0187_repeated_dna_sequences.rs => solution/s0187_repeated_dna_sequences.rs} (100%)
 rename src/{n0188_best_time_to_buy_and_sell_stock_iv.rs => solution/s0188_best_time_to_buy_and_sell_stock_iv.rs} (100%)
 rename src/{n0189_rotate_array.rs => solution/s0189_rotate_array.rs} (100%)
 rename src/{n0198_house_robber.rs => solution/s0198_house_robber.rs} (100%)
 rename src/{n0199_binary_tree_right_side_view.rs => solution/s0199_binary_tree_right_side_view.rs} (97%)
 rename src/{n0200_number_of_islands.rs => solution/s0200_number_of_islands.rs} (100%)
 rename src/{n0201_bitwise_and_of_numbers_range.rs => solution/s0201_bitwise_and_of_numbers_range.rs} (100%)
 rename src/{n0202_happy_number.rs => solution/s0202_happy_number.rs} (100%)
 rename src/{n0203_remove_linked_list_elements.rs => solution/s0203_remove_linked_list_elements.rs} (95%)
 rename src/{n0204_count_primes.rs => solution/s0204_count_primes.rs} (100%)
 rename src/{n0205_isomorphic_strings.rs => solution/s0205_isomorphic_strings.rs} (100%)
 rename src/{n0206_reverse_linked_list.rs => solution/s0206_reverse_linked_list.rs} (94%)
 rename src/{n0207_course_schedule.rs => solution/s0207_course_schedule.rs} (100%)
 rename src/{n0208_implement_trie_prefix_tree.rs => solution/s0208_implement_trie_prefix_tree.rs} (100%)
 rename src/{n0209_minimum_size_subarray_sum.rs => solution/s0209_minimum_size_subarray_sum.rs} (100%)
 rename src/{n0210_course_schedule_ii.rs => solution/s0210_course_schedule_ii.rs} (100%)
 rename src/{n0211_add_and_search_word_data_structure_design.rs => solution/s0211_add_and_search_word_data_structure_design.rs} (100%)
 rename src/{n0212_word_search_ii.rs => solution/s0212_word_search_ii.rs} (100%)
 rename src/{n0213_house_robber_ii.rs => solution/s0213_house_robber_ii.rs} (100%)
 rename src/{n0214_shortest_palindrome.rs => solution/s0214_shortest_palindrome.rs} (100%)
 rename src/{n0215_kth_largest_element_in_an_array.rs => solution/s0215_kth_largest_element_in_an_array.rs} (100%)
 rename src/{n0216_combination_sum_iii.rs => solution/s0216_combination_sum_iii.rs} (100%)
 rename src/{n0217_contains_duplicate.rs => solution/s0217_contains_duplicate.rs} (100%)
 rename src/{n0218_the_skyline_problem.rs => solution/s0218_the_skyline_problem.rs} (100%)
 rename src/{n0219_contains_duplicate_ii.rs => solution/s0219_contains_duplicate_ii.rs} (100%)
 rename src/{n0220_contains_duplicate_iii.rs => solution/s0220_contains_duplicate_iii.rs} (100%)
 rename src/{n0221_maximal_square.rs => solution/s0221_maximal_square.rs} (100%)
 rename src/{n0222_count_complete_tree_nodes.rs => solution/s0222_count_complete_tree_nodes.rs} (98%)
 rename src/{n0223_rectangle_area.rs => solution/s0223_rectangle_area.rs} (100%)
 rename src/{n0224_basic_calculator.rs => solution/s0224_basic_calculator.rs} (100%)
 rename src/{n0225_implement_stack_using_queues.rs => solution/s0225_implement_stack_using_queues.rs} (100%)
 rename src/{n0226_invert_binary_tree.rs => solution/s0226_invert_binary_tree.rs} (97%)
 rename src/{n0227_basic_calculator_ii.rs => solution/s0227_basic_calculator_ii.rs} (100%)
 rename src/{n0228_summary_ranges.rs => solution/s0228_summary_ranges.rs} (100%)
 rename src/{n0229_majority_element_ii.rs => solution/s0229_majority_element_ii.rs} (100%)
 rename src/{n0230_kth_smallest_element_in_a_bst.rs => solution/s0230_kth_smallest_element_in_a_bst.rs} (97%)
 rename src/{n0231_power_of_two.rs => solution/s0231_power_of_two.rs} (100%)
 rename src/{n0232_implement_queue_using_stacks.rs => solution/s0232_implement_queue_using_stacks.rs} (100%)
 rename src/{n0233_number_of_digit_one.rs => solution/s0233_number_of_digit_one.rs} (100%)
 rename src/{n0238_product_of_array_except_self.rs => solution/s0238_product_of_array_except_self.rs} (100%)
 rename src/{n0239_sliding_window_maximum.rs => solution/s0239_sliding_window_maximum.rs} (100%)
 rename src/{n0241_different_ways_to_add_parentheses.rs => solution/s0241_different_ways_to_add_parentheses.rs} (100%)
 rename src/{n0242_valid_anagram.rs => solution/s0242_valid_anagram.rs} (100%)
 rename src/{n0257_binary_tree_paths.rs => solution/s0257_binary_tree_paths.rs} (97%)
 rename src/{n0258_add_digits.rs => solution/s0258_add_digits.rs} (100%)
 rename src/{n0260_single_number_iii.rs => solution/s0260_single_number_iii.rs} (100%)
 rename src/{n0263_ugly_number.rs => solution/s0263_ugly_number.rs} (100%)
 rename src/{n0264_ugly_number_ii.rs => solution/s0264_ugly_number_ii.rs} (100%)
 rename src/{n0268_missing_number.rs => solution/s0268_missing_number.rs} (100%)
 rename src/{n0273_integer_to_english_words.rs => solution/s0273_integer_to_english_words.rs} (100%)
 rename src/{n0274_h_index.rs => solution/s0274_h_index.rs} (100%)
 rename src/{n0275_h_index_ii.rs => solution/s0275_h_index_ii.rs} (100%)
 rename src/{n0279_perfect_squares.rs => solution/s0279_perfect_squares.rs} (100%)
 rename src/{n0282_expression_add_operators.rs => solution/s0282_expression_add_operators.rs} (100%)
 rename src/{n0283_move_zeroes.rs => solution/s0283_move_zeroes.rs} (100%)
 rename src/{n0287_find_the_duplicate_number.rs => solution/s0287_find_the_duplicate_number.rs} (100%)
 rename src/{n0289_game_of_life.rs => solution/s0289_game_of_life.rs} (100%)
 rename src/{n0290_word_pattern.rs => solution/s0290_word_pattern.rs} (100%)
 rename src/{n0292_nim_game.rs => solution/s0292_nim_game.rs} (100%)
 rename src/{n0295_find_median_from_data_stream.rs => solution/s0295_find_median_from_data_stream.rs} (100%)
 rename src/{n0299_bulls_and_cows.rs => solution/s0299_bulls_and_cows.rs} (100%)
 rename src/{n0300_longest_increasing_subsequence.rs => solution/s0300_longest_increasing_subsequence.rs} (100%)
 rename src/{n0301_remove_invalid_parentheses.rs => solution/s0301_remove_invalid_parentheses.rs} (100%)
 rename src/{n0303_range_sum_query_immutable.rs => solution/s0303_range_sum_query_immutable.rs} (100%)
 rename src/{n0304_range_sum_query_2d_immutable.rs => solution/s0304_range_sum_query_2d_immutable.rs} (100%)
 rename src/{n0306_additive_number.rs => solution/s0306_additive_number.rs} (100%)
 rename src/{n0307_range_sum_query_mutable.rs => solution/s0307_range_sum_query_mutable.rs} (100%)
 rename src/{n0309_best_time_to_buy_and_sell_stock_with_cooldown.rs => solution/s0309_best_time_to_buy_and_sell_stock_with_cooldown.rs} (100%)
 rename src/{n0310_minimum_height_trees.rs => solution/s0310_minimum_height_trees.rs} (100%)
 rename src/{n0312_burst_balloons.rs => solution/s0312_burst_balloons.rs} (100%)
 rename src/{n0313_super_ugly_number.rs => solution/s0313_super_ugly_number.rs} (100%)
 rename src/{n0509_fibonacci_number.rs => solution/s0509_fibonacci_number.rs} (100%)
 rename src/{n0704_binary_search.rs => solution/s0704_binary_search.rs} (100%)
 rename src/{n0969_pancake_sorting.rs => solution/s0969_pancake_sorting.rs} (100%)
 rename src/{n1018_binary_prefix_divisible_by_5.rs => solution/s1018_binary_prefix_divisible_by_5.rs} (100%)
 rename src/{n1046_last_stone_weight.rs => solution/s1046_last_stone_weight.rs} (100%)

diff --git a/.gitignore b/.gitignore
index 2f7896d1..96ef862d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 target/
+.idea/
diff --git a/src/problem.rs b/src/fetcher.rs
similarity index 100%
rename from src/problem.rs
rename to src/fetcher.rs
diff --git a/src/lib.rs b/src/lib.rs
index 815c1ce0..55b0298f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,240 +1,5 @@
 #[macro_use]
 pub mod util;
 
-mod n0006_zigzag_conversion;
-mod n0238_product_of_array_except_self;
-mod n0115_distinct_subsequences;
-mod n0099_recover_binary_search_tree;
-mod n0310_minimum_height_trees;
-mod n0128_longest_consecutive_sequence;
-mod n0274_h_index;
-mod n0241_different_ways_to_add_parentheses;
-mod n0024_swap_nodes_in_pairs;
-mod n0110_balanced_binary_tree;
-mod n0093_restore_ip_addresses;
-mod n0076_minimum_window_substring;
-mod n0124_binary_tree_maximum_path_sum;
-mod n0122_best_time_to_buy_and_sell_stock_ii;
-mod n0169_majority_element;
-mod n0162_find_peak_element;
-mod n0095_unique_binary_search_trees_ii;
-mod n0155_min_stack;
-mod n0040_combination_sum_ii;
-mod n0217_contains_duplicate;
-mod n0055_jump_game;
-mod n0106_construct_binary_tree_from_inorder_and_postorder_traversal;
-mod n0145_binary_tree_postorder_traversal;
-mod n0079_word_search;
-mod n0969_pancake_sorting;
-mod n0042_trapping_rain_water;
-mod n0108_convert_sorted_array_to_binary_search_tree;
-mod n0083_remove_duplicates_from_sorted_list;
-mod n0130_surrounded_regions;
-mod n0226_invert_binary_tree;
-mod n0027_remove_element;
-mod n0188_best_time_to_buy_and_sell_stock_iv;
-mod n0204_count_primes;
-mod n0268_missing_number;
-mod n0214_shortest_palindrome;
-mod n0231_power_of_two;
-mod n0202_happy_number;
-mod n0075_sort_colors;
-mod n0066_plus_one;
-mod n0028_implement_strstr;
-mod n0290_word_pattern;
-mod n0048_rotate_image;
-mod n0089_gray_code;
-mod n0147_insertion_sort_list;
-mod n0084_largest_rectangle_in_histogram;
-mod n0011_container_with_most_water;
-mod n0009_palindrome_number;
-mod n0058_length_of_last_word;
-mod n0080_remove_duplicates_from_sorted_array_ii;
-mod n0030_substring_with_concatenation_of_all_words;
-mod n0060_permutation_sequence;
-mod n0071_simplify_path;
-mod n0038_count_and_say;
-mod n0144_binary_tree_preorder_traversal;
-mod n0279_perfect_squares;
-mod n0304_range_sum_query_2d_immutable;
-mod n0292_nim_game;
-mod n0264_ugly_number_ii;
-mod n0132_palindrome_partitioning_ii;
-mod n0019_remove_nth_node_from_end_of_list;
-mod n0136_single_number;
-mod n0018_4sum;
-mod n0220_contains_duplicate_iii;
-mod n0299_bulls_and_cows;
-mod n0232_implement_queue_using_stacks;
-mod n0100_same_tree;
-mod n0171_excel_sheet_column_number;
-mod n0087_scramble_string;
-mod n0704_binary_search;
-mod n0219_contains_duplicate_ii;
-mod n0086_partition_list;
-mod n0082_remove_duplicates_from_sorted_list_ii;
-mod n0228_summary_ranges;
-mod n0020_valid_parentheses;
-mod n0017_letter_combinations_of_a_phone_number;
-mod n0312_burst_balloons;
-mod n0306_additive_number;
-mod n0283_move_zeroes;
-mod n1018_binary_prefix_divisible_by_5;
-mod n0201_bitwise_and_of_numbers_range;
-mod n0109_convert_sorted_list_to_binary_search_tree;
-mod n0101_symmetric_tree;
-mod n0098_validate_binary_search_tree;
-mod n0035_search_insert_position;
-mod n0050_powx_n;
-mod n0198_house_robber;
-mod n0004_median_of_two_sorted_arrays;
-mod n0221_maximal_square;
-mod n0047_permutations_ii;
-mod n0172_factorial_trailing_zeroes;
-mod n0054_spiral_matrix;
-mod n0053_maximum_subarray;
-mod n1046_last_stone_weight;
-mod n0146_lru_cache;
-mod n0126_word_ladder_ii;
-mod n0242_valid_anagram;
-mod n0112_path_sum;
-mod n0023_merge_k_sorted_lists;
-mod n0230_kth_smallest_element_in_a_bst;
-mod n0104_maximum_depth_of_binary_tree;
-mod n0258_add_digits;
-mod n0187_repeated_dna_sequences;
-mod n0025_reverse_nodes_in_k_group;
-mod n0039_combination_sum;
-mod n0107_binary_tree_level_order_traversal_ii;
-mod n0091_decode_ways;
-mod n0056_merge_intervals;
-mod n0065_valid_number;
-mod n0016_3sum_closest;
-mod n0096_unique_binary_search_trees;
-mod n0072_edit_distance;
-mod n0044_wildcard_matching;
-mod n0239_sliding_window_maximum;
-mod n0174_dungeon_game;
-mod n0073_set_matrix_zeroes;
-mod n0078_subsets;
-mod n0037_sudoku_solver;
-mod n0033_search_in_rotated_sorted_array;
-mod n0002_add_two_numbers;
-mod n0313_super_ugly_number;
-mod n0068_text_justification;
-mod n0064_minimum_path_sum;
-mod n0218_the_skyline_problem;
-mod n0125_valid_palindrome;
-mod n0210_course_schedule_ii;
-mod n0143_reorder_list;
-mod n0164_maximum_gap;
-mod n0097_interleaving_string;
-mod n0105_construct_binary_tree_from_preorder_and_inorder_traversal;
-mod n0167_two_sum_ii_input_array_is_sorted;
-mod n0034_find_first_and_last_position_of_element_in_sorted_array;
-mod n0094_binary_tree_inorder_traversal;
-mod n0052_n_queens_ii;
-mod n0121_best_time_to_buy_and_sell_stock;
-mod n0273_integer_to_english_words;
-mod n0225_implement_stack_using_queues;
-mod n0046_permutations;
-mod n0085_maximal_rectangle;
-mod n0135_candy;
-mod n0113_path_sum_ii;
-mod n0029_divide_two_integers;
-mod n0260_single_number_iii;
-mod n0140_word_break_ii;
-mod n0149_max_points_on_a_line;
-mod n0213_house_robber_ii;
-mod n0222_count_complete_tree_nodes;
-mod n0134_gas_station;
-mod n0057_insert_interval;
-mod n0173_binary_search_tree_iterator;
-mod n0077_combinations;
-mod n0005_longest_palindromic_substring;
-mod n0041_first_missing_positive;
-mod n0026_remove_duplicates_from_sorted_array;
-mod n0166_fraction_to_recurring_decimal;
-mod n0119_pascals_triangle_ii;
-mod n0012_integer_to_roman;
-mod n0223_rectangle_area;
-mod n0229_majority_element_ii;
-mod n0061_rotate_list;
-mod n0123_best_time_to_buy_and_sell_stock_iii;
-mod n0301_remove_invalid_parentheses;
-mod n0067_add_binary;
-mod n0049_group_anagrams;
-mod n0189_rotate_array;
-mod n0001_two_sum;
-mod n0275_h_index_ii;
-mod n0103_binary_tree_zigzag_level_order_traversal;
-mod n0137_single_number_ii;
-mod n0208_implement_trie_prefix_tree;
-mod n0300_longest_increasing_subsequence;
-mod n0118_pascals_triangle;
-mod n0010_regular_expression_matching;
-mod n0013_roman_to_integer;
-mod n0209_minimum_size_subarray_sum;
-mod n0227_basic_calculator_ii;
-mod n0022_generate_parentheses;
-mod n0008_string_to_integer_atoi;
-mod n0152_maximum_product_subarray;
-mod n0014_longest_common_prefix;
-mod n0070_climbing_stairs;
-mod n0233_number_of_digit_one;
-mod n0154_find_minimum_in_rotated_sorted_array_ii;
-mod n0127_word_ladder;
-mod n0207_course_schedule;
-mod n0263_ugly_number;
-mod n0295_find_median_from_data_stream;
-mod n0148_sort_list;
-mod n0257_binary_tree_paths;
-mod n0120_triangle;
-mod n0309_best_time_to_buy_and_sell_stock_with_cooldown;
-mod n0074_search_a_2d_matrix;
-mod n0215_kth_largest_element_in_an_array;
-mod n0203_remove_linked_list_elements;
-mod n0081_search_in_rotated_sorted_array_ii;
-mod n0059_spiral_matrix_ii;
-mod n0151_reverse_words_in_a_string;
-mod n0205_isomorphic_strings;
-mod n0179_largest_number;
-mod n0168_excel_sheet_column_title;
-mod n0007_reverse_integer;
-mod n0032_longest_valid_parentheses;
-mod n0165_compare_version_numbers;
-mod n0031_next_permutation;
-mod n0088_merge_sorted_array;
-mod n0509_fibonacci_number;
-mod n0036_valid_sudoku;
-mod n0069_sqrtx;
-mod n0211_add_and_search_word_data_structure_design;
-mod n0114_flatten_binary_tree_to_linked_list;
-mod n0224_basic_calculator;
-mod n0045_jump_game_ii;
-mod n0051_n_queens;
-mod n0212_word_search_ii;
-mod n0287_find_the_duplicate_number;
-mod n0153_find_minimum_in_rotated_sorted_array;
-mod n0289_game_of_life;
-mod n0200_number_of_islands;
-mod n0015_3sum;
-mod n0216_combination_sum_iii;
-mod n0043_multiply_strings;
-mod n0090_subsets_ii;
-mod n0003_longest_substring;
-mod n0139_word_break;
-mod n0150_evaluate_reverse_polish_notation;
-mod n0063_unique_paths_ii;
-mod n0062_unique_paths;
-mod n0199_binary_tree_right_side_view;
-mod n0282_expression_add_operators;
-mod n0021_merge_two_sorted_lists;
-mod n0129_sum_root_to_leaf_numbers;
-mod n0206_reverse_linked_list;
-mod n0131_palindrome_partitioning;
-mod n0307_range_sum_query_mutable;
-mod n0111_minimum_depth_of_binary_tree;
-mod n0092_reverse_linked_list_ii;
-mod n0303_range_sum_query_immutable;
-mod n0102_binary_tree_level_order_traversal;
+pub mod solution;
+pub mod problem;
diff --git a/src/main.rs b/src/main.rs
index 967c5f85..e25be217 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,7 +3,7 @@ extern crate serde_derive;
 #[macro_use]
 extern crate serde_json;
 
-mod problem;
+mod fetcher;
 
 use std::env;
 use std::fs;
@@ -45,7 +45,7 @@ fn main() {
             }
         }
 
-        let problem = problem::get_problem(id).unwrap_or_else(|| {
+        let problem = fetcher::get_problem(id).unwrap_or_else(|| {
             panic!(
                 "Error: failed to get problem #{} \
                  (The problem may be paid-only or may not be exist).",
@@ -61,11 +61,11 @@ fn main() {
         let code = code.unwrap();
 
         let file_name = format!(
-            "n{:04}_{}",
+            "p{:04}_{}",
             problem.question_id,
             problem.title_slug.replace("-", "_")
         );
-        let file_path = Path::new("./src").join(format!("{}.rs", file_name));
+        let file_path = Path::new("./src/problem").join(format!("{}.rs", file_name));
         if file_path.exists() {
             panic!("problem already initialized");
         }
@@ -91,7 +91,7 @@ fn main() {
         let mut lib_file = fs::OpenOptions::new()
             .write(true)
             .append(true)
-            .open("./src/lib.rs")
+            .open("./src/problem/mod.rs")
             .unwrap();
         writeln!(lib_file, "mod {};", file_name);
         break;
@@ -136,13 +136,13 @@ fn parse_extra_use(code: &str) -> String {
     let mut extra_use_line = String::new();
     // a linked-list problem
     if code.contains("pub struct ListNode") {
-        extra_use_line.push_str("\nuse super::util::linked_list::{ListNode, to_list};")
+        extra_use_line.push_str("\nuse crate::util::linked_list::{ListNode, to_list};")
     }
     if code.contains("pub struct TreeNode") {
-        extra_use_line.push_str("\nuse super::util::tree::{TreeNode, to_tree};")
+        extra_use_line.push_str("\nuse crate::util::tree::{TreeNode, to_tree};")
     }
     if code.contains("pub struct Point") {
-        extra_use_line.push_str("\nuse super::util::point::Point;")
+        extra_use_line.push_str("\nuse crate::util::point::Point;")
     }
     extra_use_line
 }
diff --git a/src/problem/mod.rs b/src/problem/mod.rs
new file mode 100644
index 00000000..e69de29b
diff --git a/src/solution/mod.rs b/src/solution/mod.rs
new file mode 100644
index 00000000..3b079b74
--- /dev/null
+++ b/src/solution/mod.rs
@@ -0,0 +1,237 @@
+mod s0006_zigzag_conversion;
+mod s0238_product_of_array_except_self;
+mod s0115_distinct_subsequences;
+mod s0099_recover_binary_search_tree;
+mod s0310_minimum_height_trees;
+mod s0128_longest_consecutive_sequence;
+mod s0274_h_index;
+mod s0241_different_ways_to_add_parentheses;
+mod s0024_swap_nodes_in_pairs;
+mod s0110_balanced_binary_tree;
+mod s0093_restore_ip_addresses;
+mod s0076_minimum_window_substring;
+mod s0124_binary_tree_maximum_path_sum;
+mod s0122_best_time_to_buy_and_sell_stock_ii;
+mod s0169_majority_element;
+mod s0162_find_peak_element;
+mod s0095_unique_binary_search_trees_ii;
+mod s0155_min_stack;
+mod s0040_combination_sum_ii;
+mod s0217_contains_duplicate;
+mod s0055_jump_game;
+mod s0106_construct_binary_tree_from_inorder_and_postorder_traversal;
+mod s0145_binary_tree_postorder_traversal;
+mod s0079_word_search;
+mod s0969_pancake_sorting;
+mod s0042_trapping_rain_water;
+mod s0108_convert_sorted_array_to_binary_search_tree;
+mod s0083_remove_duplicates_from_sorted_list;
+mod s0130_surrounded_regions;
+mod s0226_invert_binary_tree;
+mod s0027_remove_element;
+mod s0188_best_time_to_buy_and_sell_stock_iv;
+mod s0204_count_primes;
+mod s0268_missing_number;
+mod s0214_shortest_palindrome;
+mod s0231_power_of_two;
+mod s0202_happy_number;
+mod s0075_sort_colors;
+mod s0066_plus_one;
+mod s0028_implement_strstr;
+mod s0290_word_pattern;
+mod s0048_rotate_image;
+mod s0089_gray_code;
+mod s0147_insertion_sort_list;
+mod s0084_largest_rectangle_in_histogram;
+mod s0011_container_with_most_water;
+mod s0009_palindrome_number;
+mod s0058_length_of_last_word;
+mod s0080_remove_duplicates_from_sorted_array_ii;
+mod s0030_substring_with_concatenation_of_all_words;
+mod s0060_permutation_sequence;
+mod s0071_simplify_path;
+mod s0038_count_and_say;
+mod s0144_binary_tree_preorder_traversal;
+mod s0279_perfect_squares;
+mod s0304_range_sum_query_2d_immutable;
+mod s0292_nim_game;
+mod s0264_ugly_number_ii;
+mod s0132_palindrome_partitioning_ii;
+mod s0019_remove_nth_node_from_end_of_list;
+mod s0136_single_number;
+mod s0018_4sum;
+mod s0220_contains_duplicate_iii;
+mod s0299_bulls_and_cows;
+mod s0232_implement_queue_using_stacks;
+mod s0100_same_tree;
+mod s0171_excel_sheet_column_number;
+mod s0087_scramble_string;
+mod s0704_binary_search;
+mod s0219_contains_duplicate_ii;
+mod s0086_partition_list;
+mod s0082_remove_duplicates_from_sorted_list_ii;
+mod s0228_summary_ranges;
+mod s0020_valid_parentheses;
+mod s0017_letter_combinations_of_a_phone_number;
+mod s0312_burst_balloons;
+mod s0306_additive_number;
+mod s0283_move_zeroes;
+mod s1018_binary_prefix_divisible_by_5;
+mod s0201_bitwise_and_of_numbers_range;
+mod s0109_convert_sorted_list_to_binary_search_tree;
+mod s0101_symmetric_tree;
+mod s0098_validate_binary_search_tree;
+mod s0035_search_insert_position;
+mod s0050_powx_n;
+mod s0198_house_robber;
+mod s0004_median_of_two_sorted_arrays;
+mod s0221_maximal_square;
+mod s0047_permutations_ii;
+mod s0172_factorial_trailing_zeroes;
+mod s0054_spiral_matrix;
+mod s0053_maximum_subarray;
+mod s1046_last_stone_weight;
+mod s0146_lru_cache;
+mod s0126_word_ladder_ii;
+mod s0242_valid_anagram;
+mod s0112_path_sum;
+mod s0023_merge_k_sorted_lists;
+mod s0230_kth_smallest_element_in_a_bst;
+mod s0104_maximum_depth_of_binary_tree;
+mod s0258_add_digits;
+mod s0187_repeated_dna_sequences;
+mod s0025_reverse_nodes_in_k_group;
+mod s0039_combination_sum;
+mod s0107_binary_tree_level_order_traversal_ii;
+mod s0091_decode_ways;
+mod s0056_merge_intervals;
+mod s0065_valid_number;
+mod s0016_3sum_closest;
+mod s0096_unique_binary_search_trees;
+mod s0072_edit_distance;
+mod s0044_wildcard_matching;
+mod s0239_sliding_window_maximum;
+mod s0174_dungeon_game;
+mod s0073_set_matrix_zeroes;
+mod s0078_subsets;
+mod s0037_sudoku_solver;
+mod s0033_search_in_rotated_sorted_array;
+mod s0002_add_two_numbers;
+mod s0313_super_ugly_number;
+mod s0068_text_justification;
+mod s0064_minimum_path_sum;
+mod s0218_the_skyline_problem;
+mod s0125_valid_palindrome;
+mod s0210_course_schedule_ii;
+mod s0143_reorder_list;
+mod s0164_maximum_gap;
+mod s0097_interleaving_string;
+mod s0105_construct_binary_tree_from_preorder_and_inorder_traversal;
+mod s0167_two_sum_ii_input_array_is_sorted;
+mod s0034_find_first_and_last_position_of_element_in_sorted_array;
+mod s0094_binary_tree_inorder_traversal;
+mod s0052_n_queens_ii;
+mod s0121_best_time_to_buy_and_sell_stock;
+mod s0273_integer_to_english_words;
+mod s0225_implement_stack_using_queues;
+mod s0046_permutations;
+mod s0085_maximal_rectangle;
+mod s0135_candy;
+mod s0113_path_sum_ii;
+mod s0029_divide_two_integers;
+mod s0260_single_number_iii;
+mod s0140_word_break_ii;
+mod s0149_max_points_on_a_line;
+mod s0213_house_robber_ii;
+mod s0222_count_complete_tree_nodes;
+mod s0134_gas_station;
+mod s0057_insert_interval;
+mod s0173_binary_search_tree_iterator;
+mod s0077_combinations;
+mod s0005_longest_palindromic_substring;
+mod s0041_first_missing_positive;
+mod s0026_remove_duplicates_from_sorted_array;
+mod s0166_fraction_to_recurring_decimal;
+mod s0119_pascals_triangle_ii;
+mod s0012_integer_to_roman;
+mod s0223_rectangle_area;
+mod s0229_majority_element_ii;
+mod s0061_rotate_list;
+mod s0123_best_time_to_buy_and_sell_stock_iii;
+mod s0301_remove_invalid_parentheses;
+mod s0067_add_binary;
+mod s0049_group_anagrams;
+mod s0189_rotate_array;
+mod s0001_two_sum;
+mod s0275_h_index_ii;
+mod s0103_binary_tree_zigzag_level_order_traversal;
+mod s0137_single_number_ii;
+mod s0208_implement_trie_prefix_tree;
+mod s0300_longest_increasing_subsequence;
+mod s0118_pascals_triangle;
+mod s0010_regular_expression_matching;
+mod s0013_roman_to_integer;
+mod s0209_minimum_size_subarray_sum;
+mod s0227_basic_calculator_ii;
+mod s0022_generate_parentheses;
+mod s0008_string_to_integer_atoi;
+mod s0152_maximum_product_subarray;
+mod s0014_longest_common_prefix;
+mod s0070_climbing_stairs;
+mod s0233_number_of_digit_one;
+mod s0154_find_minimum_in_rotated_sorted_array_ii;
+mod s0127_word_ladder;
+mod s0207_course_schedule;
+mod s0263_ugly_number;
+mod s0295_find_median_from_data_stream;
+mod s0148_sort_list;
+mod s0257_binary_tree_paths;
+mod s0120_triangle;
+mod s0309_best_time_to_buy_and_sell_stock_with_cooldown;
+mod s0074_search_a_2d_matrix;
+mod s0215_kth_largest_element_in_an_array;
+mod s0203_remove_linked_list_elements;
+mod s0081_search_in_rotated_sorted_array_ii;
+mod s0059_spiral_matrix_ii;
+mod s0151_reverse_words_in_a_string;
+mod s0205_isomorphic_strings;
+mod s0179_largest_number;
+mod s0168_excel_sheet_column_title;
+mod s0007_reverse_integer;
+mod s0032_longest_valid_parentheses;
+mod s0165_compare_version_numbers;
+mod s0031_next_permutation;
+mod s0088_merge_sorted_array;
+mod s0509_fibonacci_number;
+mod s0036_valid_sudoku;
+mod s0069_sqrtx;
+mod s0211_add_and_search_word_data_structure_design;
+mod s0114_flatten_binary_tree_to_linked_list;
+mod s0224_basic_calculator;
+mod s0045_jump_game_ii;
+mod s0051_n_queens;
+mod s0212_word_search_ii;
+mod s0287_find_the_duplicate_number;
+mod s0153_find_minimum_in_rotated_sorted_array;
+mod s0289_game_of_life;
+mod s0200_number_of_islands;
+mod s0015_3sum;
+mod s0216_combination_sum_iii;
+mod s0043_multiply_strings;
+mod s0090_subsets_ii;
+mod s0003_longest_substring;
+mod s0139_word_break;
+mod s0150_evaluate_reverse_polish_notation;
+mod s0063_unique_paths_ii;
+mod s0062_unique_paths;
+mod s0199_binary_tree_right_side_view;
+mod s0282_expression_add_operators;
+mod s0021_merge_two_sorted_lists;
+mod s0129_sum_root_to_leaf_numbers;
+mod s0206_reverse_linked_list;
+mod s0131_palindrome_partitioning;
+mod s0307_range_sum_query_mutable;
+mod s0111_minimum_depth_of_binary_tree;
+mod s0092_reverse_linked_list_ii;
+mod s0303_range_sum_query_immutable;
+mod s0102_binary_tree_level_order_traversal;
diff --git a/src/n0001_two_sum.rs b/src/solution/s0001_two_sum.rs
similarity index 100%
rename from src/n0001_two_sum.rs
rename to src/solution/s0001_two_sum.rs
diff --git a/src/n0002_add_two_numbers.rs b/src/solution/s0002_add_two_numbers.rs
similarity index 98%
rename from src/n0002_add_two_numbers.rs
rename to src/solution/s0002_add_two_numbers.rs
index b7b21b01..5612c3d4 100644
--- a/src/n0002_add_two_numbers.rs
+++ b/src/solution/s0002_add_two_numbers.rs
@@ -17,7 +17,7 @@
  *
  */
 pub struct Solution {}
-use super::util::linked_list::{to_list, ListNode};
+use crate::util::linked_list::{to_list, ListNode};
 
 // submission codes start here
 
diff --git a/src/n0003_longest_substring.rs b/src/solution/s0003_longest_substring.rs
similarity index 100%
rename from src/n0003_longest_substring.rs
rename to src/solution/s0003_longest_substring.rs
diff --git a/src/n0004_median_of_two_sorted_arrays.rs b/src/solution/s0004_median_of_two_sorted_arrays.rs
similarity index 100%
rename from src/n0004_median_of_two_sorted_arrays.rs
rename to src/solution/s0004_median_of_two_sorted_arrays.rs
diff --git a/src/n0005_longest_palindromic_substring.rs b/src/solution/s0005_longest_palindromic_substring.rs
similarity index 100%
rename from src/n0005_longest_palindromic_substring.rs
rename to src/solution/s0005_longest_palindromic_substring.rs
diff --git a/src/n0006_zigzag_conversion.rs b/src/solution/s0006_zigzag_conversion.rs
similarity index 100%
rename from src/n0006_zigzag_conversion.rs
rename to src/solution/s0006_zigzag_conversion.rs
diff --git a/src/n0007_reverse_integer.rs b/src/solution/s0007_reverse_integer.rs
similarity index 100%
rename from src/n0007_reverse_integer.rs
rename to src/solution/s0007_reverse_integer.rs
diff --git a/src/n0008_string_to_integer_atoi.rs b/src/solution/s0008_string_to_integer_atoi.rs
similarity index 100%
rename from src/n0008_string_to_integer_atoi.rs
rename to src/solution/s0008_string_to_integer_atoi.rs
diff --git a/src/n0009_palindrome_number.rs b/src/solution/s0009_palindrome_number.rs
similarity index 100%
rename from src/n0009_palindrome_number.rs
rename to src/solution/s0009_palindrome_number.rs
diff --git a/src/n0010_regular_expression_matching.rs b/src/solution/s0010_regular_expression_matching.rs
similarity index 100%
rename from src/n0010_regular_expression_matching.rs
rename to src/solution/s0010_regular_expression_matching.rs
diff --git a/src/n0011_container_with_most_water.rs b/src/solution/s0011_container_with_most_water.rs
similarity index 100%
rename from src/n0011_container_with_most_water.rs
rename to src/solution/s0011_container_with_most_water.rs
diff --git a/src/n0012_integer_to_roman.rs b/src/solution/s0012_integer_to_roman.rs
similarity index 100%
rename from src/n0012_integer_to_roman.rs
rename to src/solution/s0012_integer_to_roman.rs
diff --git a/src/n0013_roman_to_integer.rs b/src/solution/s0013_roman_to_integer.rs
similarity index 100%
rename from src/n0013_roman_to_integer.rs
rename to src/solution/s0013_roman_to_integer.rs
diff --git a/src/n0014_longest_common_prefix.rs b/src/solution/s0014_longest_common_prefix.rs
similarity index 100%
rename from src/n0014_longest_common_prefix.rs
rename to src/solution/s0014_longest_common_prefix.rs
diff --git a/src/n0015_3sum.rs b/src/solution/s0015_3sum.rs
similarity index 100%
rename from src/n0015_3sum.rs
rename to src/solution/s0015_3sum.rs
diff --git a/src/n0016_3sum_closest.rs b/src/solution/s0016_3sum_closest.rs
similarity index 100%
rename from src/n0016_3sum_closest.rs
rename to src/solution/s0016_3sum_closest.rs
diff --git a/src/n0017_letter_combinations_of_a_phone_number.rs b/src/solution/s0017_letter_combinations_of_a_phone_number.rs
similarity index 100%
rename from src/n0017_letter_combinations_of_a_phone_number.rs
rename to src/solution/s0017_letter_combinations_of_a_phone_number.rs
diff --git a/src/n0018_4sum.rs b/src/solution/s0018_4sum.rs
similarity index 100%
rename from src/n0018_4sum.rs
rename to src/solution/s0018_4sum.rs
diff --git a/src/n0019_remove_nth_node_from_end_of_list.rs b/src/solution/s0019_remove_nth_node_from_end_of_list.rs
similarity index 97%
rename from src/n0019_remove_nth_node_from_end_of_list.rs
rename to src/solution/s0019_remove_nth_node_from_end_of_list.rs
index a1698a45..b3dac826 100644
--- a/src/n0019_remove_nth_node_from_end_of_list.rs
+++ b/src/solution/s0019_remove_nth_node_from_end_of_list.rs
@@ -21,7 +21,7 @@
  *
  */
 pub struct Solution {}
-use super::util::linked_list::{to_list, ListNode};
+use crate::util::linked_list::{to_list, ListNode};
 
 // submission codes start here
 
diff --git a/src/n0020_valid_parentheses.rs b/src/solution/s0020_valid_parentheses.rs
similarity index 100%
rename from src/n0020_valid_parentheses.rs
rename to src/solution/s0020_valid_parentheses.rs
diff --git a/src/n0021_merge_two_sorted_lists.rs b/src/solution/s0021_merge_two_sorted_lists.rs
similarity index 97%
rename from src/n0021_merge_two_sorted_lists.rs
rename to src/solution/s0021_merge_two_sorted_lists.rs
index 5a25adf7..c496d8e0 100644
--- a/src/n0021_merge_two_sorted_lists.rs
+++ b/src/solution/s0021_merge_two_sorted_lists.rs
@@ -11,7 +11,7 @@
  *
  */
 pub struct Solution {}
-use super::util::linked_list::{to_list, ListNode};
+use crate::util::linked_list::{to_list, ListNode};
 
 // submission codes start here
 
diff --git a/src/n0022_generate_parentheses.rs b/src/solution/s0022_generate_parentheses.rs
similarity index 100%
rename from src/n0022_generate_parentheses.rs
rename to src/solution/s0022_generate_parentheses.rs
diff --git a/src/n0023_merge_k_sorted_lists.rs b/src/solution/s0023_merge_k_sorted_lists.rs
similarity index 97%
rename from src/n0023_merge_k_sorted_lists.rs
rename to src/solution/s0023_merge_k_sorted_lists.rs
index 74b95045..c213eb7d 100644
--- a/src/n0023_merge_k_sorted_lists.rs
+++ b/src/solution/s0023_merge_k_sorted_lists.rs
@@ -17,7 +17,7 @@
  *
  */
 pub struct Solution {}
-use super::util::linked_list::{to_list, ListNode};
+use crate::util::linked_list::{to_list, ListNode};
 
 // submission codes start here
 use std::cmp::Ordering;
diff --git a/src/n0024_swap_nodes_in_pairs.rs b/src/solution/s0024_swap_nodes_in_pairs.rs
similarity index 97%
rename from src/n0024_swap_nodes_in_pairs.rs
rename to src/solution/s0024_swap_nodes_in_pairs.rs
index 41e3c6c4..104d6b9e 100644
--- a/src/n0024_swap_nodes_in_pairs.rs
+++ b/src/solution/s0024_swap_nodes_in_pairs.rs
@@ -17,7 +17,7 @@
  *
  */
 pub struct Solution {}
-use super::util::linked_list::{to_list, ListNode};
+use crate::util::linked_list::{to_list, ListNode};
 
 // submission codes start here
 
diff --git a/src/n0025_reverse_nodes_in_k_group.rs b/src/solution/s0025_reverse_nodes_in_k_group.rs
similarity index 98%
rename from src/n0025_reverse_nodes_in_k_group.rs
rename to src/solution/s0025_reverse_nodes_in_k_group.rs
index aac987f7..3beb5528 100644
--- a/src/n0025_reverse_nodes_in_k_group.rs
+++ b/src/solution/s0025_reverse_nodes_in_k_group.rs
@@ -25,7 +25,7 @@
  *
  */
 pub struct Solution {}
-use super::util::linked_list::{to_list, ListNode};
+use crate::util::linked_list::{to_list, ListNode};
 
 // submission codes start here
 
diff --git a/src/n0026_remove_duplicates_from_sorted_array.rs b/src/solution/s0026_remove_duplicates_from_sorted_array.rs
similarity index 100%
rename from src/n0026_remove_duplicates_from_sorted_array.rs
rename to src/solution/s0026_remove_duplicates_from_sorted_array.rs
diff --git a/src/n0027_remove_element.rs b/src/solution/s0027_remove_element.rs
similarity index 100%
rename from src/n0027_remove_element.rs
rename to src/solution/s0027_remove_element.rs
diff --git a/src/n0028_implement_strstr.rs b/src/solution/s0028_implement_strstr.rs
similarity index 100%
rename from src/n0028_implement_strstr.rs
rename to src/solution/s0028_implement_strstr.rs
diff --git a/src/n0029_divide_two_integers.rs b/src/solution/s0029_divide_two_integers.rs
similarity index 100%
rename from src/n0029_divide_two_integers.rs
rename to src/solution/s0029_divide_two_integers.rs
diff --git a/src/n0030_substring_with_concatenation_of_all_words.rs b/src/solution/s0030_substring_with_concatenation_of_all_words.rs
similarity index 100%
rename from src/n0030_substring_with_concatenation_of_all_words.rs
rename to src/solution/s0030_substring_with_concatenation_of_all_words.rs
diff --git a/src/n0031_next_permutation.rs b/src/solution/s0031_next_permutation.rs
similarity index 100%
rename from src/n0031_next_permutation.rs
rename to src/solution/s0031_next_permutation.rs
diff --git a/src/n0032_longest_valid_parentheses.rs b/src/solution/s0032_longest_valid_parentheses.rs
similarity index 100%
rename from src/n0032_longest_valid_parentheses.rs
rename to src/solution/s0032_longest_valid_parentheses.rs
diff --git a/src/n0033_search_in_rotated_sorted_array.rs b/src/solution/s0033_search_in_rotated_sorted_array.rs
similarity index 100%
rename from src/n0033_search_in_rotated_sorted_array.rs
rename to src/solution/s0033_search_in_rotated_sorted_array.rs
diff --git a/src/n0034_find_first_and_last_position_of_element_in_sorted_array.rs b/src/solution/s0034_find_first_and_last_position_of_element_in_sorted_array.rs
similarity index 100%
rename from src/n0034_find_first_and_last_position_of_element_in_sorted_array.rs
rename to src/solution/s0034_find_first_and_last_position_of_element_in_sorted_array.rs
diff --git a/src/n0035_search_insert_position.rs b/src/solution/s0035_search_insert_position.rs
similarity index 100%
rename from src/n0035_search_insert_position.rs
rename to src/solution/s0035_search_insert_position.rs
diff --git a/src/n0036_valid_sudoku.rs b/src/solution/s0036_valid_sudoku.rs
similarity index 100%
rename from src/n0036_valid_sudoku.rs
rename to src/solution/s0036_valid_sudoku.rs
diff --git a/src/n0037_sudoku_solver.rs b/src/solution/s0037_sudoku_solver.rs
similarity index 100%
rename from src/n0037_sudoku_solver.rs
rename to src/solution/s0037_sudoku_solver.rs
diff --git a/src/n0038_count_and_say.rs b/src/solution/s0038_count_and_say.rs
similarity index 100%
rename from src/n0038_count_and_say.rs
rename to src/solution/s0038_count_and_say.rs
diff --git a/src/n0039_combination_sum.rs b/src/solution/s0039_combination_sum.rs
similarity index 100%
rename from src/n0039_combination_sum.rs
rename to src/solution/s0039_combination_sum.rs
diff --git a/src/n0040_combination_sum_ii.rs b/src/solution/s0040_combination_sum_ii.rs
similarity index 100%
rename from src/n0040_combination_sum_ii.rs
rename to src/solution/s0040_combination_sum_ii.rs
diff --git a/src/n0041_first_missing_positive.rs b/src/solution/s0041_first_missing_positive.rs
similarity index 100%
rename from src/n0041_first_missing_positive.rs
rename to src/solution/s0041_first_missing_positive.rs
diff --git a/src/n0042_trapping_rain_water.rs b/src/solution/s0042_trapping_rain_water.rs
similarity index 100%
rename from src/n0042_trapping_rain_water.rs
rename to src/solution/s0042_trapping_rain_water.rs
diff --git a/src/n0043_multiply_strings.rs b/src/solution/s0043_multiply_strings.rs
similarity index 100%
rename from src/n0043_multiply_strings.rs
rename to src/solution/s0043_multiply_strings.rs
diff --git a/src/n0044_wildcard_matching.rs b/src/solution/s0044_wildcard_matching.rs
similarity index 100%
rename from src/n0044_wildcard_matching.rs
rename to src/solution/s0044_wildcard_matching.rs
diff --git a/src/n0045_jump_game_ii.rs b/src/solution/s0045_jump_game_ii.rs
similarity index 100%
rename from src/n0045_jump_game_ii.rs
rename to src/solution/s0045_jump_game_ii.rs
diff --git a/src/n0046_permutations.rs b/src/solution/s0046_permutations.rs
similarity index 100%
rename from src/n0046_permutations.rs
rename to src/solution/s0046_permutations.rs
diff --git a/src/n0047_permutations_ii.rs b/src/solution/s0047_permutations_ii.rs
similarity index 100%
rename from src/n0047_permutations_ii.rs
rename to src/solution/s0047_permutations_ii.rs
diff --git a/src/n0048_rotate_image.rs b/src/solution/s0048_rotate_image.rs
similarity index 100%
rename from src/n0048_rotate_image.rs
rename to src/solution/s0048_rotate_image.rs
diff --git a/src/n0049_group_anagrams.rs b/src/solution/s0049_group_anagrams.rs
similarity index 100%
rename from src/n0049_group_anagrams.rs
rename to src/solution/s0049_group_anagrams.rs
diff --git a/src/n0050_powx_n.rs b/src/solution/s0050_powx_n.rs
similarity index 100%
rename from src/n0050_powx_n.rs
rename to src/solution/s0050_powx_n.rs
diff --git a/src/n0051_n_queens.rs b/src/solution/s0051_n_queens.rs
similarity index 100%
rename from src/n0051_n_queens.rs
rename to src/solution/s0051_n_queens.rs
diff --git a/src/n0052_n_queens_ii.rs b/src/solution/s0052_n_queens_ii.rs
similarity index 100%
rename from src/n0052_n_queens_ii.rs
rename to src/solution/s0052_n_queens_ii.rs
diff --git a/src/n0053_maximum_subarray.rs b/src/solution/s0053_maximum_subarray.rs
similarity index 100%
rename from src/n0053_maximum_subarray.rs
rename to src/solution/s0053_maximum_subarray.rs
diff --git a/src/n0054_spiral_matrix.rs b/src/solution/s0054_spiral_matrix.rs
similarity index 100%
rename from src/n0054_spiral_matrix.rs
rename to src/solution/s0054_spiral_matrix.rs
diff --git a/src/n0055_jump_game.rs b/src/solution/s0055_jump_game.rs
similarity index 100%
rename from src/n0055_jump_game.rs
rename to src/solution/s0055_jump_game.rs
diff --git a/src/n0056_merge_intervals.rs b/src/solution/s0056_merge_intervals.rs
similarity index 100%
rename from src/n0056_merge_intervals.rs
rename to src/solution/s0056_merge_intervals.rs
diff --git a/src/n0057_insert_interval.rs b/src/solution/s0057_insert_interval.rs
similarity index 100%
rename from src/n0057_insert_interval.rs
rename to src/solution/s0057_insert_interval.rs
diff --git a/src/n0058_length_of_last_word.rs b/src/solution/s0058_length_of_last_word.rs
similarity index 100%
rename from src/n0058_length_of_last_word.rs
rename to src/solution/s0058_length_of_last_word.rs
diff --git a/src/n0059_spiral_matrix_ii.rs b/src/solution/s0059_spiral_matrix_ii.rs
similarity index 100%
rename from src/n0059_spiral_matrix_ii.rs
rename to src/solution/s0059_spiral_matrix_ii.rs
diff --git a/src/n0060_permutation_sequence.rs b/src/solution/s0060_permutation_sequence.rs
similarity index 100%
rename from src/n0060_permutation_sequence.rs
rename to src/solution/s0060_permutation_sequence.rs
diff --git a/src/n0061_rotate_list.rs b/src/solution/s0061_rotate_list.rs
similarity index 94%
rename from src/n0061_rotate_list.rs
rename to src/solution/s0061_rotate_list.rs
index 08812115..b7723576 100644
--- a/src/n0061_rotate_list.rs
+++ b/src/solution/s0061_rotate_list.rs
@@ -26,7 +26,7 @@
  *
  */
 pub struct Solution {}
-use super::util::linked_list::{to_list, ListNode};
+use crate::util::linked_list::{to_list, ListNode};
 
 // submission codes start here
 
diff --git a/src/n0062_unique_paths.rs b/src/solution/s0062_unique_paths.rs
similarity index 100%
rename from src/n0062_unique_paths.rs
rename to src/solution/s0062_unique_paths.rs
diff --git a/src/n0063_unique_paths_ii.rs b/src/solution/s0063_unique_paths_ii.rs
similarity index 100%
rename from src/n0063_unique_paths_ii.rs
rename to src/solution/s0063_unique_paths_ii.rs
diff --git a/src/n0064_minimum_path_sum.rs b/src/solution/s0064_minimum_path_sum.rs
similarity index 100%
rename from src/n0064_minimum_path_sum.rs
rename to src/solution/s0064_minimum_path_sum.rs
diff --git a/src/n0065_valid_number.rs b/src/solution/s0065_valid_number.rs
similarity index 100%
rename from src/n0065_valid_number.rs
rename to src/solution/s0065_valid_number.rs
diff --git a/src/n0066_plus_one.rs b/src/solution/s0066_plus_one.rs
similarity index 100%
rename from src/n0066_plus_one.rs
rename to src/solution/s0066_plus_one.rs
diff --git a/src/n0067_add_binary.rs b/src/solution/s0067_add_binary.rs
similarity index 100%
rename from src/n0067_add_binary.rs
rename to src/solution/s0067_add_binary.rs
diff --git a/src/n0068_text_justification.rs b/src/solution/s0068_text_justification.rs
similarity index 100%
rename from src/n0068_text_justification.rs
rename to src/solution/s0068_text_justification.rs
diff --git a/src/n0069_sqrtx.rs b/src/solution/s0069_sqrtx.rs
similarity index 100%
rename from src/n0069_sqrtx.rs
rename to src/solution/s0069_sqrtx.rs
diff --git a/src/n0070_climbing_stairs.rs b/src/solution/s0070_climbing_stairs.rs
similarity index 100%
rename from src/n0070_climbing_stairs.rs
rename to src/solution/s0070_climbing_stairs.rs
diff --git a/src/n0071_simplify_path.rs b/src/solution/s0071_simplify_path.rs
similarity index 100%
rename from src/n0071_simplify_path.rs
rename to src/solution/s0071_simplify_path.rs
diff --git a/src/n0072_edit_distance.rs b/src/solution/s0072_edit_distance.rs
similarity index 100%
rename from src/n0072_edit_distance.rs
rename to src/solution/s0072_edit_distance.rs
diff --git a/src/n0073_set_matrix_zeroes.rs b/src/solution/s0073_set_matrix_zeroes.rs
similarity index 100%
rename from src/n0073_set_matrix_zeroes.rs
rename to src/solution/s0073_set_matrix_zeroes.rs
diff --git a/src/n0074_search_a_2d_matrix.rs b/src/solution/s0074_search_a_2d_matrix.rs
similarity index 100%
rename from src/n0074_search_a_2d_matrix.rs
rename to src/solution/s0074_search_a_2d_matrix.rs
diff --git a/src/n0075_sort_colors.rs b/src/solution/s0075_sort_colors.rs
similarity index 100%
rename from src/n0075_sort_colors.rs
rename to src/solution/s0075_sort_colors.rs
diff --git a/src/n0076_minimum_window_substring.rs b/src/solution/s0076_minimum_window_substring.rs
similarity index 100%
rename from src/n0076_minimum_window_substring.rs
rename to src/solution/s0076_minimum_window_substring.rs
diff --git a/src/n0077_combinations.rs b/src/solution/s0077_combinations.rs
similarity index 100%
rename from src/n0077_combinations.rs
rename to src/solution/s0077_combinations.rs
diff --git a/src/n0078_subsets.rs b/src/solution/s0078_subsets.rs
similarity index 100%
rename from src/n0078_subsets.rs
rename to src/solution/s0078_subsets.rs
diff --git a/src/n0079_word_search.rs b/src/solution/s0079_word_search.rs
similarity index 100%
rename from src/n0079_word_search.rs
rename to src/solution/s0079_word_search.rs
diff --git a/src/n0080_remove_duplicates_from_sorted_array_ii.rs b/src/solution/s0080_remove_duplicates_from_sorted_array_ii.rs
similarity index 100%
rename from src/n0080_remove_duplicates_from_sorted_array_ii.rs
rename to src/solution/s0080_remove_duplicates_from_sorted_array_ii.rs
diff --git a/src/n0081_search_in_rotated_sorted_array_ii.rs b/src/solution/s0081_search_in_rotated_sorted_array_ii.rs
similarity index 100%
rename from src/n0081_search_in_rotated_sorted_array_ii.rs
rename to src/solution/s0081_search_in_rotated_sorted_array_ii.rs
diff --git a/src/n0082_remove_duplicates_from_sorted_list_ii.rs b/src/solution/s0082_remove_duplicates_from_sorted_list_ii.rs
similarity index 94%
rename from src/n0082_remove_duplicates_from_sorted_list_ii.rs
rename to src/solution/s0082_remove_duplicates_from_sorted_list_ii.rs
index ff8c8b8b..d04b15f8 100644
--- a/src/n0082_remove_duplicates_from_sorted_list_ii.rs
+++ b/src/solution/s0082_remove_duplicates_from_sorted_list_ii.rs
@@ -19,7 +19,7 @@
  *
  */
 pub struct Solution {}
-use super::util::linked_list::{to_list, ListNode};
+use crate::util::linked_list::{to_list, ListNode};
 
 // submission codes start here
 
diff --git a/src/n0083_remove_duplicates_from_sorted_list.rs b/src/solution/s0083_remove_duplicates_from_sorted_list.rs
similarity index 94%
rename from src/n0083_remove_duplicates_from_sorted_list.rs
rename to src/solution/s0083_remove_duplicates_from_sorted_list.rs
index b8fa539f..785cc03f 100644
--- a/src/n0083_remove_duplicates_from_sorted_list.rs
+++ b/src/solution/s0083_remove_duplicates_from_sorted_list.rs
@@ -19,7 +19,7 @@
  *
  */
 pub struct Solution {}
-use super::util::linked_list::{to_list, ListNode};
+use crate::util::linked_list::{to_list, ListNode};
 
 // submission codes start here
 
diff --git a/src/n0084_largest_rectangle_in_histogram.rs b/src/solution/s0084_largest_rectangle_in_histogram.rs
similarity index 100%
rename from src/n0084_largest_rectangle_in_histogram.rs
rename to src/solution/s0084_largest_rectangle_in_histogram.rs
diff --git a/src/n0085_maximal_rectangle.rs b/src/solution/s0085_maximal_rectangle.rs
similarity index 100%
rename from src/n0085_maximal_rectangle.rs
rename to src/solution/s0085_maximal_rectangle.rs
diff --git a/src/n0086_partition_list.rs b/src/solution/s0086_partition_list.rs
similarity index 97%
rename from src/n0086_partition_list.rs
rename to src/solution/s0086_partition_list.rs
index ad03b081..4238586f 100644
--- a/src/n0086_partition_list.rs
+++ b/src/solution/s0086_partition_list.rs
@@ -14,7 +14,7 @@
  *
  */
 pub struct Solution {}
-use super::util::linked_list::{to_list, ListNode};
+use crate::util::linked_list::{to_list, ListNode};
 
 impl Solution {
     pub fn partition(head: Option<Box<ListNode>>, x: i32) -> Option<Box<ListNode>> {
diff --git a/src/n0087_scramble_string.rs b/src/solution/s0087_scramble_string.rs
similarity index 100%
rename from src/n0087_scramble_string.rs
rename to src/solution/s0087_scramble_string.rs
diff --git a/src/n0088_merge_sorted_array.rs b/src/solution/s0088_merge_sorted_array.rs
similarity index 100%
rename from src/n0088_merge_sorted_array.rs
rename to src/solution/s0088_merge_sorted_array.rs
diff --git a/src/n0089_gray_code.rs b/src/solution/s0089_gray_code.rs
similarity index 100%
rename from src/n0089_gray_code.rs
rename to src/solution/s0089_gray_code.rs
diff --git a/src/n0090_subsets_ii.rs b/src/solution/s0090_subsets_ii.rs
similarity index 100%
rename from src/n0090_subsets_ii.rs
rename to src/solution/s0090_subsets_ii.rs
diff --git a/src/n0091_decode_ways.rs b/src/solution/s0091_decode_ways.rs
similarity index 100%
rename from src/n0091_decode_ways.rs
rename to src/solution/s0091_decode_ways.rs
diff --git a/src/n0092_reverse_linked_list_ii.rs b/src/solution/s0092_reverse_linked_list_ii.rs
similarity index 94%
rename from src/n0092_reverse_linked_list_ii.rs
rename to src/solution/s0092_reverse_linked_list_ii.rs
index 705a7875..e84035da 100644
--- a/src/n0092_reverse_linked_list_ii.rs
+++ b/src/solution/s0092_reverse_linked_list_ii.rs
@@ -14,7 +14,7 @@
  *
  */
 pub struct Solution {}
-use super::util::linked_list::{to_list, ListNode};
+use crate::util::linked_list::{to_list, ListNode};
 
 // submission codes start here
 
diff --git a/src/n0093_restore_ip_addresses.rs b/src/solution/s0093_restore_ip_addresses.rs
similarity index 100%
rename from src/n0093_restore_ip_addresses.rs
rename to src/solution/s0093_restore_ip_addresses.rs
diff --git a/src/n0094_binary_tree_inorder_traversal.rs b/src/solution/s0094_binary_tree_inorder_traversal.rs
similarity index 96%
rename from src/n0094_binary_tree_inorder_traversal.rs
rename to src/solution/s0094_binary_tree_inorder_traversal.rs
index c40cd1c8..d4d2ea2a 100644
--- a/src/n0094_binary_tree_inorder_traversal.rs
+++ b/src/solution/s0094_binary_tree_inorder_traversal.rs
@@ -22,7 +22,7 @@ pub struct Solution {}
 
 // submission codes start here
 
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 use std::cell::RefCell;
 use std::rc::Rc;
 impl Solution {
diff --git a/src/n0095_unique_binary_search_trees_ii.rs b/src/solution/s0095_unique_binary_search_trees_ii.rs
similarity index 97%
rename from src/n0095_unique_binary_search_trees_ii.rs
rename to src/solution/s0095_unique_binary_search_trees_ii.rs
index 3ab366e4..ffdc763b 100644
--- a/src/n0095_unique_binary_search_trees_ii.rs
+++ b/src/solution/s0095_unique_binary_search_trees_ii.rs
@@ -48,7 +48,7 @@ pub struct Solution {}
       / \
      2   4
  */
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 use std::cell::RefCell;
 use std::rc::Rc;
 impl Solution {
diff --git a/src/n0096_unique_binary_search_trees.rs b/src/solution/s0096_unique_binary_search_trees.rs
similarity index 100%
rename from src/n0096_unique_binary_search_trees.rs
rename to src/solution/s0096_unique_binary_search_trees.rs
diff --git a/src/n0097_interleaving_string.rs b/src/solution/s0097_interleaving_string.rs
similarity index 100%
rename from src/n0097_interleaving_string.rs
rename to src/solution/s0097_interleaving_string.rs
diff --git a/src/n0098_validate_binary_search_tree.rs b/src/solution/s0098_validate_binary_search_tree.rs
similarity index 98%
rename from src/n0098_validate_binary_search_tree.rs
rename to src/solution/s0098_validate_binary_search_tree.rs
index fcb359ee..7f55a47e 100644
--- a/src/n0098_validate_binary_search_tree.rs
+++ b/src/solution/s0098_validate_binary_search_tree.rs
@@ -40,7 +40,7 @@ pub struct Solution {}
 // submission codes start here
 
 // Definition for a binary tree node.
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 use std::cell::RefCell;
 use std::rc::Rc;
diff --git a/src/n0099_recover_binary_search_tree.rs b/src/solution/s0099_recover_binary_search_tree.rs
similarity index 95%
rename from src/n0099_recover_binary_search_tree.rs
rename to src/solution/s0099_recover_binary_search_tree.rs
index 8bc39b3d..3b92da04 100644
--- a/src/n0099_recover_binary_search_tree.rs
+++ b/src/solution/s0099_recover_binary_search_tree.rs
@@ -55,7 +55,7 @@
  */
 pub struct Solution {}
 
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0100_same_tree.rs b/src/solution/s0100_same_tree.rs
similarity index 96%
rename from src/n0100_same_tree.rs
rename to src/solution/s0100_same_tree.rs
index 51b7ad79..f1ca1972 100644
--- a/src/n0100_same_tree.rs
+++ b/src/solution/s0100_same_tree.rs
@@ -44,7 +44,7 @@
  */
 pub struct Solution {}
 
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 // submission codes start here
 use std::cell::RefCell;
 use std::rc::Rc;
diff --git a/src/n0101_symmetric_tree.rs b/src/solution/s0101_symmetric_tree.rs
similarity index 97%
rename from src/n0101_symmetric_tree.rs
rename to src/solution/s0101_symmetric_tree.rs
index d341ff34..c62962d2 100644
--- a/src/n0101_symmetric_tree.rs
+++ b/src/solution/s0101_symmetric_tree.rs
@@ -30,7 +30,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0102_binary_tree_level_order_traversal.rs b/src/solution/s0102_binary_tree_level_order_traversal.rs
similarity index 97%
rename from src/n0102_binary_tree_level_order_traversal.rs
rename to src/solution/s0102_binary_tree_level_order_traversal.rs
index 6fdabf6e..42f782a5 100644
--- a/src/n0102_binary_tree_level_order_traversal.rs
+++ b/src/solution/s0102_binary_tree_level_order_traversal.rs
@@ -26,7 +26,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0103_binary_tree_zigzag_level_order_traversal.rs b/src/solution/s0103_binary_tree_zigzag_level_order_traversal.rs
similarity index 97%
rename from src/n0103_binary_tree_zigzag_level_order_traversal.rs
rename to src/solution/s0103_binary_tree_zigzag_level_order_traversal.rs
index ce31b6b8..96476fda 100644
--- a/src/n0103_binary_tree_zigzag_level_order_traversal.rs
+++ b/src/solution/s0103_binary_tree_zigzag_level_order_traversal.rs
@@ -26,7 +26,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0104_maximum_depth_of_binary_tree.rs b/src/solution/s0104_maximum_depth_of_binary_tree.rs
similarity index 96%
rename from src/n0104_maximum_depth_of_binary_tree.rs
rename to src/solution/s0104_maximum_depth_of_binary_tree.rs
index c5faf233..6d2f18e6 100644
--- a/src/n0104_maximum_depth_of_binary_tree.rs
+++ b/src/solution/s0104_maximum_depth_of_binary_tree.rs
@@ -22,7 +22,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0105_construct_binary_tree_from_preorder_and_inorder_traversal.rs b/src/solution/s0105_construct_binary_tree_from_preorder_and_inorder_traversal.rs
similarity index 97%
rename from src/n0105_construct_binary_tree_from_preorder_and_inorder_traversal.rs
rename to src/solution/s0105_construct_binary_tree_from_preorder_and_inorder_traversal.rs
index 611725de..e271faa5 100644
--- a/src/n0105_construct_binary_tree_from_preorder_and_inorder_traversal.rs
+++ b/src/solution/s0105_construct_binary_tree_from_preorder_and_inorder_traversal.rs
@@ -23,7 +23,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0106_construct_binary_tree_from_inorder_and_postorder_traversal.rs b/src/solution/s0106_construct_binary_tree_from_inorder_and_postorder_traversal.rs
similarity index 97%
rename from src/n0106_construct_binary_tree_from_inorder_and_postorder_traversal.rs
rename to src/solution/s0106_construct_binary_tree_from_inorder_and_postorder_traversal.rs
index 7d3e820c..63c469be 100644
--- a/src/n0106_construct_binary_tree_from_inorder_and_postorder_traversal.rs
+++ b/src/solution/s0106_construct_binary_tree_from_inorder_and_postorder_traversal.rs
@@ -24,7 +24,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0107_binary_tree_level_order_traversal_ii.rs b/src/solution/s0107_binary_tree_level_order_traversal_ii.rs
similarity index 97%
rename from src/n0107_binary_tree_level_order_traversal_ii.rs
rename to src/solution/s0107_binary_tree_level_order_traversal_ii.rs
index 42855964..f77229a6 100644
--- a/src/n0107_binary_tree_level_order_traversal_ii.rs
+++ b/src/solution/s0107_binary_tree_level_order_traversal_ii.rs
@@ -26,7 +26,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0108_convert_sorted_array_to_binary_search_tree.rs b/src/solution/s0108_convert_sorted_array_to_binary_search_tree.rs
similarity index 97%
rename from src/n0108_convert_sorted_array_to_binary_search_tree.rs
rename to src/solution/s0108_convert_sorted_array_to_binary_search_tree.rs
index 4da33781..67e4b2ac 100644
--- a/src/n0108_convert_sorted_array_to_binary_search_tree.rs
+++ b/src/solution/s0108_convert_sorted_array_to_binary_search_tree.rs
@@ -21,7 +21,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0109_convert_sorted_list_to_binary_search_tree.rs b/src/solution/s0109_convert_sorted_list_to_binary_search_tree.rs
similarity index 94%
rename from src/n0109_convert_sorted_list_to_binary_search_tree.rs
rename to src/solution/s0109_convert_sorted_list_to_binary_search_tree.rs
index 072c6eac..6bb37b0e 100644
--- a/src/n0109_convert_sorted_list_to_binary_search_tree.rs
+++ b/src/solution/s0109_convert_sorted_list_to_binary_search_tree.rs
@@ -21,8 +21,8 @@
  *
  */
 pub struct Solution {}
-use super::util::linked_list::{to_list, ListNode};
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::linked_list::{to_list, ListNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0110_balanced_binary_tree.rs b/src/solution/s0110_balanced_binary_tree.rs
similarity index 93%
rename from src/n0110_balanced_binary_tree.rs
rename to src/solution/s0110_balanced_binary_tree.rs
index 68e1b2ad..bb067d02 100644
--- a/src/n0110_balanced_binary_tree.rs
+++ b/src/solution/s0110_balanced_binary_tree.rs
@@ -40,7 +40,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0111_minimum_depth_of_binary_tree.rs b/src/solution/s0111_minimum_depth_of_binary_tree.rs
similarity index 96%
rename from src/n0111_minimum_depth_of_binary_tree.rs
rename to src/solution/s0111_minimum_depth_of_binary_tree.rs
index f537c316..1efb759d 100644
--- a/src/n0111_minimum_depth_of_binary_tree.rs
+++ b/src/solution/s0111_minimum_depth_of_binary_tree.rs
@@ -22,7 +22,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0112_path_sum.rs b/src/solution/s0112_path_sum.rs
similarity index 97%
rename from src/n0112_path_sum.rs
rename to src/solution/s0112_path_sum.rs
index 72e34da0..2f036b21 100644
--- a/src/n0112_path_sum.rs
+++ b/src/solution/s0112_path_sum.rs
@@ -23,7 +23,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0113_path_sum_ii.rs b/src/solution/s0113_path_sum_ii.rs
similarity index 97%
rename from src/n0113_path_sum_ii.rs
rename to src/solution/s0113_path_sum_ii.rs
index c9914e08..d567e693 100644
--- a/src/n0113_path_sum_ii.rs
+++ b/src/solution/s0113_path_sum_ii.rs
@@ -30,7 +30,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0114_flatten_binary_tree_to_linked_list.rs b/src/solution/s0114_flatten_binary_tree_to_linked_list.rs
similarity index 97%
rename from src/n0114_flatten_binary_tree_to_linked_list.rs
rename to src/solution/s0114_flatten_binary_tree_to_linked_list.rs
index 2b46cd42..9661e9e7 100644
--- a/src/n0114_flatten_binary_tree_to_linked_list.rs
+++ b/src/solution/s0114_flatten_binary_tree_to_linked_list.rs
@@ -31,7 +31,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0115_distinct_subsequences.rs b/src/solution/s0115_distinct_subsequences.rs
similarity index 100%
rename from src/n0115_distinct_subsequences.rs
rename to src/solution/s0115_distinct_subsequences.rs
diff --git a/src/n0118_pascals_triangle.rs b/src/solution/s0118_pascals_triangle.rs
similarity index 100%
rename from src/n0118_pascals_triangle.rs
rename to src/solution/s0118_pascals_triangle.rs
diff --git a/src/n0119_pascals_triangle_ii.rs b/src/solution/s0119_pascals_triangle_ii.rs
similarity index 100%
rename from src/n0119_pascals_triangle_ii.rs
rename to src/solution/s0119_pascals_triangle_ii.rs
diff --git a/src/n0120_triangle.rs b/src/solution/s0120_triangle.rs
similarity index 100%
rename from src/n0120_triangle.rs
rename to src/solution/s0120_triangle.rs
diff --git a/src/n0121_best_time_to_buy_and_sell_stock.rs b/src/solution/s0121_best_time_to_buy_and_sell_stock.rs
similarity index 100%
rename from src/n0121_best_time_to_buy_and_sell_stock.rs
rename to src/solution/s0121_best_time_to_buy_and_sell_stock.rs
diff --git a/src/n0122_best_time_to_buy_and_sell_stock_ii.rs b/src/solution/s0122_best_time_to_buy_and_sell_stock_ii.rs
similarity index 100%
rename from src/n0122_best_time_to_buy_and_sell_stock_ii.rs
rename to src/solution/s0122_best_time_to_buy_and_sell_stock_ii.rs
diff --git a/src/n0123_best_time_to_buy_and_sell_stock_iii.rs b/src/solution/s0123_best_time_to_buy_and_sell_stock_iii.rs
similarity index 100%
rename from src/n0123_best_time_to_buy_and_sell_stock_iii.rs
rename to src/solution/s0123_best_time_to_buy_and_sell_stock_iii.rs
diff --git a/src/n0124_binary_tree_maximum_path_sum.rs b/src/solution/s0124_binary_tree_maximum_path_sum.rs
similarity index 98%
rename from src/n0124_binary_tree_maximum_path_sum.rs
rename to src/solution/s0124_binary_tree_maximum_path_sum.rs
index 5517d18f..f76f3178 100644
--- a/src/n0124_binary_tree_maximum_path_sum.rs
+++ b/src/solution/s0124_binary_tree_maximum_path_sum.rs
@@ -33,7 +33,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0125_valid_palindrome.rs b/src/solution/s0125_valid_palindrome.rs
similarity index 100%
rename from src/n0125_valid_palindrome.rs
rename to src/solution/s0125_valid_palindrome.rs
diff --git a/src/n0126_word_ladder_ii.rs b/src/solution/s0126_word_ladder_ii.rs
similarity index 100%
rename from src/n0126_word_ladder_ii.rs
rename to src/solution/s0126_word_ladder_ii.rs
diff --git a/src/n0127_word_ladder.rs b/src/solution/s0127_word_ladder.rs
similarity index 100%
rename from src/n0127_word_ladder.rs
rename to src/solution/s0127_word_ladder.rs
diff --git a/src/n0128_longest_consecutive_sequence.rs b/src/solution/s0128_longest_consecutive_sequence.rs
similarity index 100%
rename from src/n0128_longest_consecutive_sequence.rs
rename to src/solution/s0128_longest_consecutive_sequence.rs
diff --git a/src/n0129_sum_root_to_leaf_numbers.rs b/src/solution/s0129_sum_root_to_leaf_numbers.rs
similarity index 97%
rename from src/n0129_sum_root_to_leaf_numbers.rs
rename to src/solution/s0129_sum_root_to_leaf_numbers.rs
index 5e423c34..c52dc94c 100644
--- a/src/n0129_sum_root_to_leaf_numbers.rs
+++ b/src/solution/s0129_sum_root_to_leaf_numbers.rs
@@ -40,7 +40,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0130_surrounded_regions.rs b/src/solution/s0130_surrounded_regions.rs
similarity index 100%
rename from src/n0130_surrounded_regions.rs
rename to src/solution/s0130_surrounded_regions.rs
diff --git a/src/n0131_palindrome_partitioning.rs b/src/solution/s0131_palindrome_partitioning.rs
similarity index 100%
rename from src/n0131_palindrome_partitioning.rs
rename to src/solution/s0131_palindrome_partitioning.rs
diff --git a/src/n0132_palindrome_partitioning_ii.rs b/src/solution/s0132_palindrome_partitioning_ii.rs
similarity index 100%
rename from src/n0132_palindrome_partitioning_ii.rs
rename to src/solution/s0132_palindrome_partitioning_ii.rs
diff --git a/src/n0134_gas_station.rs b/src/solution/s0134_gas_station.rs
similarity index 100%
rename from src/n0134_gas_station.rs
rename to src/solution/s0134_gas_station.rs
diff --git a/src/n0135_candy.rs b/src/solution/s0135_candy.rs
similarity index 100%
rename from src/n0135_candy.rs
rename to src/solution/s0135_candy.rs
diff --git a/src/n0136_single_number.rs b/src/solution/s0136_single_number.rs
similarity index 100%
rename from src/n0136_single_number.rs
rename to src/solution/s0136_single_number.rs
diff --git a/src/n0137_single_number_ii.rs b/src/solution/s0137_single_number_ii.rs
similarity index 100%
rename from src/n0137_single_number_ii.rs
rename to src/solution/s0137_single_number_ii.rs
diff --git a/src/n0139_word_break.rs b/src/solution/s0139_word_break.rs
similarity index 100%
rename from src/n0139_word_break.rs
rename to src/solution/s0139_word_break.rs
diff --git a/src/n0140_word_break_ii.rs b/src/solution/s0140_word_break_ii.rs
similarity index 100%
rename from src/n0140_word_break_ii.rs
rename to src/solution/s0140_word_break_ii.rs
diff --git a/src/n0143_reorder_list.rs b/src/solution/s0143_reorder_list.rs
similarity index 93%
rename from src/n0143_reorder_list.rs
rename to src/solution/s0143_reorder_list.rs
index 169c44d1..06ec32af 100644
--- a/src/n0143_reorder_list.rs
+++ b/src/solution/s0143_reorder_list.rs
@@ -19,7 +19,7 @@
  *
  */
 pub struct Solution {}
-use super::util::linked_list::{to_list, ListNode};
+use crate::util::linked_list::{to_list, ListNode};
 
 // submission codes start here
 
diff --git a/src/n0144_binary_tree_preorder_traversal.rs b/src/solution/s0144_binary_tree_preorder_traversal.rs
similarity index 96%
rename from src/n0144_binary_tree_preorder_traversal.rs
rename to src/solution/s0144_binary_tree_preorder_traversal.rs
index 951014c6..02ed1f7a 100644
--- a/src/n0144_binary_tree_preorder_traversal.rs
+++ b/src/solution/s0144_binary_tree_preorder_traversal.rs
@@ -20,7 +20,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0145_binary_tree_postorder_traversal.rs b/src/solution/s0145_binary_tree_postorder_traversal.rs
similarity index 96%
rename from src/n0145_binary_tree_postorder_traversal.rs
rename to src/solution/s0145_binary_tree_postorder_traversal.rs
index 66495658..2670b5bd 100644
--- a/src/n0145_binary_tree_postorder_traversal.rs
+++ b/src/solution/s0145_binary_tree_postorder_traversal.rs
@@ -20,7 +20,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0146_lru_cache.rs b/src/solution/s0146_lru_cache.rs
similarity index 100%
rename from src/n0146_lru_cache.rs
rename to src/solution/s0146_lru_cache.rs
diff --git a/src/n0147_insertion_sort_list.rs b/src/solution/s0147_insertion_sort_list.rs
similarity index 96%
rename from src/n0147_insertion_sort_list.rs
rename to src/solution/s0147_insertion_sort_list.rs
index edcd0787..cdcd2d69 100644
--- a/src/n0147_insertion_sort_list.rs
+++ b/src/solution/s0147_insertion_sort_list.rs
@@ -9,7 +9,7 @@
  * <img alt="" src="https://upload.wikimedia.org/wikipedia/commons/0/0f/Insertion-sort-example-300px.gif" style="height:180px; width:300px" /><br />
  * <small>A graphical example of insertion sort. The partial sorted list (black) initially contains only the first element in the list.<br />
  * With each iteration one element (red) is removed from the input data and inserted in-place into the sorted list</small><br />
- *  
+ *
  *
  * <ol>
  * </ol>
@@ -39,7 +39,7 @@
  *
  */
 pub struct Solution {}
-use super::util::linked_list::{to_list, ListNode};
+use crate::util::linked_list::{to_list, ListNode};
 
 // submission codes start here
 
diff --git a/src/n0148_sort_list.rs b/src/solution/s0148_sort_list.rs
similarity index 98%
rename from src/n0148_sort_list.rs
rename to src/solution/s0148_sort_list.rs
index 5fd6a8a2..4bc8ac17 100644
--- a/src/n0148_sort_list.rs
+++ b/src/solution/s0148_sort_list.rs
@@ -18,7 +18,7 @@
  *
  */
 pub struct Solution {}
-use super::util::linked_list::{to_list, ListNode};
+use crate::util::linked_list::{to_list, ListNode};
 
 // submission codes start here
 
diff --git a/src/n0149_max_points_on_a_line.rs b/src/solution/s0149_max_points_on_a_line.rs
similarity index 95%
rename from src/n0149_max_points_on_a_line.rs
rename to src/solution/s0149_max_points_on_a_line.rs
index dff94777..c2faf93b 100644
--- a/src/n0149_max_points_on_a_line.rs
+++ b/src/solution/s0149_max_points_on_a_line.rs
@@ -13,7 +13,7 @@
  * |
  * |        o
  * |     o
- * |  o  
+ * |  o
  * +------------->
  * 0  1  2  3  4
  *
@@ -36,7 +36,7 @@
  *
  */
 pub struct Solution {}
-use super::util::point::Point;
+use crate::util::point::Point;
 
 /*
 要回顾下高中数学：已知两点, 求解一般式:
diff --git a/src/n0150_evaluate_reverse_polish_notation.rs b/src/solution/s0150_evaluate_reverse_polish_notation.rs
similarity index 100%
rename from src/n0150_evaluate_reverse_polish_notation.rs
rename to src/solution/s0150_evaluate_reverse_polish_notation.rs
diff --git a/src/n0151_reverse_words_in_a_string.rs b/src/solution/s0151_reverse_words_in_a_string.rs
similarity index 100%
rename from src/n0151_reverse_words_in_a_string.rs
rename to src/solution/s0151_reverse_words_in_a_string.rs
diff --git a/src/n0152_maximum_product_subarray.rs b/src/solution/s0152_maximum_product_subarray.rs
similarity index 100%
rename from src/n0152_maximum_product_subarray.rs
rename to src/solution/s0152_maximum_product_subarray.rs
diff --git a/src/n0153_find_minimum_in_rotated_sorted_array.rs b/src/solution/s0153_find_minimum_in_rotated_sorted_array.rs
similarity index 100%
rename from src/n0153_find_minimum_in_rotated_sorted_array.rs
rename to src/solution/s0153_find_minimum_in_rotated_sorted_array.rs
diff --git a/src/n0154_find_minimum_in_rotated_sorted_array_ii.rs b/src/solution/s0154_find_minimum_in_rotated_sorted_array_ii.rs
similarity index 100%
rename from src/n0154_find_minimum_in_rotated_sorted_array_ii.rs
rename to src/solution/s0154_find_minimum_in_rotated_sorted_array_ii.rs
diff --git a/src/n0155_min_stack.rs b/src/solution/s0155_min_stack.rs
similarity index 100%
rename from src/n0155_min_stack.rs
rename to src/solution/s0155_min_stack.rs
diff --git a/src/n0162_find_peak_element.rs b/src/solution/s0162_find_peak_element.rs
similarity index 100%
rename from src/n0162_find_peak_element.rs
rename to src/solution/s0162_find_peak_element.rs
diff --git a/src/n0164_maximum_gap.rs b/src/solution/s0164_maximum_gap.rs
similarity index 100%
rename from src/n0164_maximum_gap.rs
rename to src/solution/s0164_maximum_gap.rs
diff --git a/src/n0165_compare_version_numbers.rs b/src/solution/s0165_compare_version_numbers.rs
similarity index 100%
rename from src/n0165_compare_version_numbers.rs
rename to src/solution/s0165_compare_version_numbers.rs
diff --git a/src/n0166_fraction_to_recurring_decimal.rs b/src/solution/s0166_fraction_to_recurring_decimal.rs
similarity index 100%
rename from src/n0166_fraction_to_recurring_decimal.rs
rename to src/solution/s0166_fraction_to_recurring_decimal.rs
diff --git a/src/n0167_two_sum_ii_input_array_is_sorted.rs b/src/solution/s0167_two_sum_ii_input_array_is_sorted.rs
similarity index 100%
rename from src/n0167_two_sum_ii_input_array_is_sorted.rs
rename to src/solution/s0167_two_sum_ii_input_array_is_sorted.rs
diff --git a/src/n0168_excel_sheet_column_title.rs b/src/solution/s0168_excel_sheet_column_title.rs
similarity index 100%
rename from src/n0168_excel_sheet_column_title.rs
rename to src/solution/s0168_excel_sheet_column_title.rs
diff --git a/src/n0169_majority_element.rs b/src/solution/s0169_majority_element.rs
similarity index 100%
rename from src/n0169_majority_element.rs
rename to src/solution/s0169_majority_element.rs
diff --git a/src/n0171_excel_sheet_column_number.rs b/src/solution/s0171_excel_sheet_column_number.rs
similarity index 100%
rename from src/n0171_excel_sheet_column_number.rs
rename to src/solution/s0171_excel_sheet_column_number.rs
diff --git a/src/n0172_factorial_trailing_zeroes.rs b/src/solution/s0172_factorial_trailing_zeroes.rs
similarity index 100%
rename from src/n0172_factorial_trailing_zeroes.rs
rename to src/solution/s0172_factorial_trailing_zeroes.rs
diff --git a/src/n0173_binary_search_tree_iterator.rs b/src/solution/s0173_binary_search_tree_iterator.rs
similarity index 94%
rename from src/n0173_binary_search_tree_iterator.rs
rename to src/solution/s0173_binary_search_tree_iterator.rs
index 582e922a..caef4724 100644
--- a/src/n0173_binary_search_tree_iterator.rs
+++ b/src/solution/s0173_binary_search_tree_iterator.rs
@@ -5,7 +5,7 @@
  *
  * Calling next() will return the next smallest number in the BST.
  *
- *  
+ *
  *
  *
  *
@@ -27,7 +27,7 @@
  * iterator.hasNext(); // return false
  *
  *
- *  
+ *
  *
  * Note:
  *
@@ -38,7 +38,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 use std::cell::RefCell;
 use std::rc::Rc;
 
diff --git a/src/n0174_dungeon_game.rs b/src/solution/s0174_dungeon_game.rs
similarity index 100%
rename from src/n0174_dungeon_game.rs
rename to src/solution/s0174_dungeon_game.rs
diff --git a/src/n0179_largest_number.rs b/src/solution/s0179_largest_number.rs
similarity index 100%
rename from src/n0179_largest_number.rs
rename to src/solution/s0179_largest_number.rs
diff --git a/src/n0187_repeated_dna_sequences.rs b/src/solution/s0187_repeated_dna_sequences.rs
similarity index 100%
rename from src/n0187_repeated_dna_sequences.rs
rename to src/solution/s0187_repeated_dna_sequences.rs
diff --git a/src/n0188_best_time_to_buy_and_sell_stock_iv.rs b/src/solution/s0188_best_time_to_buy_and_sell_stock_iv.rs
similarity index 100%
rename from src/n0188_best_time_to_buy_and_sell_stock_iv.rs
rename to src/solution/s0188_best_time_to_buy_and_sell_stock_iv.rs
diff --git a/src/n0189_rotate_array.rs b/src/solution/s0189_rotate_array.rs
similarity index 100%
rename from src/n0189_rotate_array.rs
rename to src/solution/s0189_rotate_array.rs
diff --git a/src/n0198_house_robber.rs b/src/solution/s0198_house_robber.rs
similarity index 100%
rename from src/n0198_house_robber.rs
rename to src/solution/s0198_house_robber.rs
diff --git a/src/n0199_binary_tree_right_side_view.rs b/src/solution/s0199_binary_tree_right_side_view.rs
similarity index 97%
rename from src/n0199_binary_tree_right_side_view.rs
rename to src/solution/s0199_binary_tree_right_side_view.rs
index 403a3404..c580970c 100644
--- a/src/n0199_binary_tree_right_side_view.rs
+++ b/src/solution/s0199_binary_tree_right_side_view.rs
@@ -18,7 +18,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0200_number_of_islands.rs b/src/solution/s0200_number_of_islands.rs
similarity index 100%
rename from src/n0200_number_of_islands.rs
rename to src/solution/s0200_number_of_islands.rs
diff --git a/src/n0201_bitwise_and_of_numbers_range.rs b/src/solution/s0201_bitwise_and_of_numbers_range.rs
similarity index 100%
rename from src/n0201_bitwise_and_of_numbers_range.rs
rename to src/solution/s0201_bitwise_and_of_numbers_range.rs
diff --git a/src/n0202_happy_number.rs b/src/solution/s0202_happy_number.rs
similarity index 100%
rename from src/n0202_happy_number.rs
rename to src/solution/s0202_happy_number.rs
diff --git a/src/n0203_remove_linked_list_elements.rs b/src/solution/s0203_remove_linked_list_elements.rs
similarity index 95%
rename from src/n0203_remove_linked_list_elements.rs
rename to src/solution/s0203_remove_linked_list_elements.rs
index 290923d6..f8d9bc43 100644
--- a/src/n0203_remove_linked_list_elements.rs
+++ b/src/solution/s0203_remove_linked_list_elements.rs
@@ -12,7 +12,7 @@
  *
  */
 pub struct Solution {}
-use super::util::linked_list::{to_list, ListNode};
+use crate::util::linked_list::{to_list, ListNode};
 
 // submission codes start here
 
diff --git a/src/n0204_count_primes.rs b/src/solution/s0204_count_primes.rs
similarity index 100%
rename from src/n0204_count_primes.rs
rename to src/solution/s0204_count_primes.rs
diff --git a/src/n0205_isomorphic_strings.rs b/src/solution/s0205_isomorphic_strings.rs
similarity index 100%
rename from src/n0205_isomorphic_strings.rs
rename to src/solution/s0205_isomorphic_strings.rs
diff --git a/src/n0206_reverse_linked_list.rs b/src/solution/s0206_reverse_linked_list.rs
similarity index 94%
rename from src/n0206_reverse_linked_list.rs
rename to src/solution/s0206_reverse_linked_list.rs
index bdbe34e4..4689f415 100644
--- a/src/n0206_reverse_linked_list.rs
+++ b/src/solution/s0206_reverse_linked_list.rs
@@ -16,7 +16,7 @@
  *
  */
 pub struct Solution {}
-use super::util::linked_list::{to_list, ListNode};
+use crate::util::linked_list::{to_list, ListNode};
 
 // submission codes start here
 
diff --git a/src/n0207_course_schedule.rs b/src/solution/s0207_course_schedule.rs
similarity index 100%
rename from src/n0207_course_schedule.rs
rename to src/solution/s0207_course_schedule.rs
diff --git a/src/n0208_implement_trie_prefix_tree.rs b/src/solution/s0208_implement_trie_prefix_tree.rs
similarity index 100%
rename from src/n0208_implement_trie_prefix_tree.rs
rename to src/solution/s0208_implement_trie_prefix_tree.rs
diff --git a/src/n0209_minimum_size_subarray_sum.rs b/src/solution/s0209_minimum_size_subarray_sum.rs
similarity index 100%
rename from src/n0209_minimum_size_subarray_sum.rs
rename to src/solution/s0209_minimum_size_subarray_sum.rs
diff --git a/src/n0210_course_schedule_ii.rs b/src/solution/s0210_course_schedule_ii.rs
similarity index 100%
rename from src/n0210_course_schedule_ii.rs
rename to src/solution/s0210_course_schedule_ii.rs
diff --git a/src/n0211_add_and_search_word_data_structure_design.rs b/src/solution/s0211_add_and_search_word_data_structure_design.rs
similarity index 100%
rename from src/n0211_add_and_search_word_data_structure_design.rs
rename to src/solution/s0211_add_and_search_word_data_structure_design.rs
diff --git a/src/n0212_word_search_ii.rs b/src/solution/s0212_word_search_ii.rs
similarity index 100%
rename from src/n0212_word_search_ii.rs
rename to src/solution/s0212_word_search_ii.rs
diff --git a/src/n0213_house_robber_ii.rs b/src/solution/s0213_house_robber_ii.rs
similarity index 100%
rename from src/n0213_house_robber_ii.rs
rename to src/solution/s0213_house_robber_ii.rs
diff --git a/src/n0214_shortest_palindrome.rs b/src/solution/s0214_shortest_palindrome.rs
similarity index 100%
rename from src/n0214_shortest_palindrome.rs
rename to src/solution/s0214_shortest_palindrome.rs
diff --git a/src/n0215_kth_largest_element_in_an_array.rs b/src/solution/s0215_kth_largest_element_in_an_array.rs
similarity index 100%
rename from src/n0215_kth_largest_element_in_an_array.rs
rename to src/solution/s0215_kth_largest_element_in_an_array.rs
diff --git a/src/n0216_combination_sum_iii.rs b/src/solution/s0216_combination_sum_iii.rs
similarity index 100%
rename from src/n0216_combination_sum_iii.rs
rename to src/solution/s0216_combination_sum_iii.rs
diff --git a/src/n0217_contains_duplicate.rs b/src/solution/s0217_contains_duplicate.rs
similarity index 100%
rename from src/n0217_contains_duplicate.rs
rename to src/solution/s0217_contains_duplicate.rs
diff --git a/src/n0218_the_skyline_problem.rs b/src/solution/s0218_the_skyline_problem.rs
similarity index 100%
rename from src/n0218_the_skyline_problem.rs
rename to src/solution/s0218_the_skyline_problem.rs
diff --git a/src/n0219_contains_duplicate_ii.rs b/src/solution/s0219_contains_duplicate_ii.rs
similarity index 100%
rename from src/n0219_contains_duplicate_ii.rs
rename to src/solution/s0219_contains_duplicate_ii.rs
diff --git a/src/n0220_contains_duplicate_iii.rs b/src/solution/s0220_contains_duplicate_iii.rs
similarity index 100%
rename from src/n0220_contains_duplicate_iii.rs
rename to src/solution/s0220_contains_duplicate_iii.rs
diff --git a/src/n0221_maximal_square.rs b/src/solution/s0221_maximal_square.rs
similarity index 100%
rename from src/n0221_maximal_square.rs
rename to src/solution/s0221_maximal_square.rs
diff --git a/src/n0222_count_complete_tree_nodes.rs b/src/solution/s0222_count_complete_tree_nodes.rs
similarity index 98%
rename from src/n0222_count_complete_tree_nodes.rs
rename to src/solution/s0222_count_complete_tree_nodes.rs
index c511399d..189fb3dd 100644
--- a/src/n0222_count_complete_tree_nodes.rs
+++ b/src/solution/s0222_count_complete_tree_nodes.rs
@@ -22,7 +22,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0223_rectangle_area.rs b/src/solution/s0223_rectangle_area.rs
similarity index 100%
rename from src/n0223_rectangle_area.rs
rename to src/solution/s0223_rectangle_area.rs
diff --git a/src/n0224_basic_calculator.rs b/src/solution/s0224_basic_calculator.rs
similarity index 100%
rename from src/n0224_basic_calculator.rs
rename to src/solution/s0224_basic_calculator.rs
diff --git a/src/n0225_implement_stack_using_queues.rs b/src/solution/s0225_implement_stack_using_queues.rs
similarity index 100%
rename from src/n0225_implement_stack_using_queues.rs
rename to src/solution/s0225_implement_stack_using_queues.rs
diff --git a/src/n0226_invert_binary_tree.rs b/src/solution/s0226_invert_binary_tree.rs
similarity index 97%
rename from src/n0226_invert_binary_tree.rs
rename to src/solution/s0226_invert_binary_tree.rs
index 29e2a953..30bd001a 100644
--- a/src/n0226_invert_binary_tree.rs
+++ b/src/solution/s0226_invert_binary_tree.rs
@@ -30,7 +30,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0227_basic_calculator_ii.rs b/src/solution/s0227_basic_calculator_ii.rs
similarity index 100%
rename from src/n0227_basic_calculator_ii.rs
rename to src/solution/s0227_basic_calculator_ii.rs
diff --git a/src/n0228_summary_ranges.rs b/src/solution/s0228_summary_ranges.rs
similarity index 100%
rename from src/n0228_summary_ranges.rs
rename to src/solution/s0228_summary_ranges.rs
diff --git a/src/n0229_majority_element_ii.rs b/src/solution/s0229_majority_element_ii.rs
similarity index 100%
rename from src/n0229_majority_element_ii.rs
rename to src/solution/s0229_majority_element_ii.rs
diff --git a/src/n0230_kth_smallest_element_in_a_bst.rs b/src/solution/s0230_kth_smallest_element_in_a_bst.rs
similarity index 97%
rename from src/n0230_kth_smallest_element_in_a_bst.rs
rename to src/solution/s0230_kth_smallest_element_in_a_bst.rs
index 65de4484..fe14721f 100644
--- a/src/n0230_kth_smallest_element_in_a_bst.rs
+++ b/src/solution/s0230_kth_smallest_element_in_a_bst.rs
@@ -36,7 +36,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0231_power_of_two.rs b/src/solution/s0231_power_of_two.rs
similarity index 100%
rename from src/n0231_power_of_two.rs
rename to src/solution/s0231_power_of_two.rs
diff --git a/src/n0232_implement_queue_using_stacks.rs b/src/solution/s0232_implement_queue_using_stacks.rs
similarity index 100%
rename from src/n0232_implement_queue_using_stacks.rs
rename to src/solution/s0232_implement_queue_using_stacks.rs
diff --git a/src/n0233_number_of_digit_one.rs b/src/solution/s0233_number_of_digit_one.rs
similarity index 100%
rename from src/n0233_number_of_digit_one.rs
rename to src/solution/s0233_number_of_digit_one.rs
diff --git a/src/n0238_product_of_array_except_self.rs b/src/solution/s0238_product_of_array_except_self.rs
similarity index 100%
rename from src/n0238_product_of_array_except_self.rs
rename to src/solution/s0238_product_of_array_except_self.rs
diff --git a/src/n0239_sliding_window_maximum.rs b/src/solution/s0239_sliding_window_maximum.rs
similarity index 100%
rename from src/n0239_sliding_window_maximum.rs
rename to src/solution/s0239_sliding_window_maximum.rs
diff --git a/src/n0241_different_ways_to_add_parentheses.rs b/src/solution/s0241_different_ways_to_add_parentheses.rs
similarity index 100%
rename from src/n0241_different_ways_to_add_parentheses.rs
rename to src/solution/s0241_different_ways_to_add_parentheses.rs
diff --git a/src/n0242_valid_anagram.rs b/src/solution/s0242_valid_anagram.rs
similarity index 100%
rename from src/n0242_valid_anagram.rs
rename to src/solution/s0242_valid_anagram.rs
diff --git a/src/n0257_binary_tree_paths.rs b/src/solution/s0257_binary_tree_paths.rs
similarity index 97%
rename from src/n0257_binary_tree_paths.rs
rename to src/solution/s0257_binary_tree_paths.rs
index ef5254c9..c5d6d336 100644
--- a/src/n0257_binary_tree_paths.rs
+++ b/src/solution/s0257_binary_tree_paths.rs
@@ -22,7 +22,7 @@
  *
  */
 pub struct Solution {}
-use super::util::tree::{to_tree, TreeNode};
+use crate::util::tree::{to_tree, TreeNode};
 
 // submission codes start here
 
diff --git a/src/n0258_add_digits.rs b/src/solution/s0258_add_digits.rs
similarity index 100%
rename from src/n0258_add_digits.rs
rename to src/solution/s0258_add_digits.rs
diff --git a/src/n0260_single_number_iii.rs b/src/solution/s0260_single_number_iii.rs
similarity index 100%
rename from src/n0260_single_number_iii.rs
rename to src/solution/s0260_single_number_iii.rs
diff --git a/src/n0263_ugly_number.rs b/src/solution/s0263_ugly_number.rs
similarity index 100%
rename from src/n0263_ugly_number.rs
rename to src/solution/s0263_ugly_number.rs
diff --git a/src/n0264_ugly_number_ii.rs b/src/solution/s0264_ugly_number_ii.rs
similarity index 100%
rename from src/n0264_ugly_number_ii.rs
rename to src/solution/s0264_ugly_number_ii.rs
diff --git a/src/n0268_missing_number.rs b/src/solution/s0268_missing_number.rs
similarity index 100%
rename from src/n0268_missing_number.rs
rename to src/solution/s0268_missing_number.rs
diff --git a/src/n0273_integer_to_english_words.rs b/src/solution/s0273_integer_to_english_words.rs
similarity index 100%
rename from src/n0273_integer_to_english_words.rs
rename to src/solution/s0273_integer_to_english_words.rs
diff --git a/src/n0274_h_index.rs b/src/solution/s0274_h_index.rs
similarity index 100%
rename from src/n0274_h_index.rs
rename to src/solution/s0274_h_index.rs
diff --git a/src/n0275_h_index_ii.rs b/src/solution/s0275_h_index_ii.rs
similarity index 100%
rename from src/n0275_h_index_ii.rs
rename to src/solution/s0275_h_index_ii.rs
diff --git a/src/n0279_perfect_squares.rs b/src/solution/s0279_perfect_squares.rs
similarity index 100%
rename from src/n0279_perfect_squares.rs
rename to src/solution/s0279_perfect_squares.rs
diff --git a/src/n0282_expression_add_operators.rs b/src/solution/s0282_expression_add_operators.rs
similarity index 100%
rename from src/n0282_expression_add_operators.rs
rename to src/solution/s0282_expression_add_operators.rs
diff --git a/src/n0283_move_zeroes.rs b/src/solution/s0283_move_zeroes.rs
similarity index 100%
rename from src/n0283_move_zeroes.rs
rename to src/solution/s0283_move_zeroes.rs
diff --git a/src/n0287_find_the_duplicate_number.rs b/src/solution/s0287_find_the_duplicate_number.rs
similarity index 100%
rename from src/n0287_find_the_duplicate_number.rs
rename to src/solution/s0287_find_the_duplicate_number.rs
diff --git a/src/n0289_game_of_life.rs b/src/solution/s0289_game_of_life.rs
similarity index 100%
rename from src/n0289_game_of_life.rs
rename to src/solution/s0289_game_of_life.rs
diff --git a/src/n0290_word_pattern.rs b/src/solution/s0290_word_pattern.rs
similarity index 100%
rename from src/n0290_word_pattern.rs
rename to src/solution/s0290_word_pattern.rs
diff --git a/src/n0292_nim_game.rs b/src/solution/s0292_nim_game.rs
similarity index 100%
rename from src/n0292_nim_game.rs
rename to src/solution/s0292_nim_game.rs
diff --git a/src/n0295_find_median_from_data_stream.rs b/src/solution/s0295_find_median_from_data_stream.rs
similarity index 100%
rename from src/n0295_find_median_from_data_stream.rs
rename to src/solution/s0295_find_median_from_data_stream.rs
diff --git a/src/n0299_bulls_and_cows.rs b/src/solution/s0299_bulls_and_cows.rs
similarity index 100%
rename from src/n0299_bulls_and_cows.rs
rename to src/solution/s0299_bulls_and_cows.rs
diff --git a/src/n0300_longest_increasing_subsequence.rs b/src/solution/s0300_longest_increasing_subsequence.rs
similarity index 100%
rename from src/n0300_longest_increasing_subsequence.rs
rename to src/solution/s0300_longest_increasing_subsequence.rs
diff --git a/src/n0301_remove_invalid_parentheses.rs b/src/solution/s0301_remove_invalid_parentheses.rs
similarity index 100%
rename from src/n0301_remove_invalid_parentheses.rs
rename to src/solution/s0301_remove_invalid_parentheses.rs
diff --git a/src/n0303_range_sum_query_immutable.rs b/src/solution/s0303_range_sum_query_immutable.rs
similarity index 100%
rename from src/n0303_range_sum_query_immutable.rs
rename to src/solution/s0303_range_sum_query_immutable.rs
diff --git a/src/n0304_range_sum_query_2d_immutable.rs b/src/solution/s0304_range_sum_query_2d_immutable.rs
similarity index 100%
rename from src/n0304_range_sum_query_2d_immutable.rs
rename to src/solution/s0304_range_sum_query_2d_immutable.rs
diff --git a/src/n0306_additive_number.rs b/src/solution/s0306_additive_number.rs
similarity index 100%
rename from src/n0306_additive_number.rs
rename to src/solution/s0306_additive_number.rs
diff --git a/src/n0307_range_sum_query_mutable.rs b/src/solution/s0307_range_sum_query_mutable.rs
similarity index 100%
rename from src/n0307_range_sum_query_mutable.rs
rename to src/solution/s0307_range_sum_query_mutable.rs
diff --git a/src/n0309_best_time_to_buy_and_sell_stock_with_cooldown.rs b/src/solution/s0309_best_time_to_buy_and_sell_stock_with_cooldown.rs
similarity index 100%
rename from src/n0309_best_time_to_buy_and_sell_stock_with_cooldown.rs
rename to src/solution/s0309_best_time_to_buy_and_sell_stock_with_cooldown.rs
diff --git a/src/n0310_minimum_height_trees.rs b/src/solution/s0310_minimum_height_trees.rs
similarity index 100%
rename from src/n0310_minimum_height_trees.rs
rename to src/solution/s0310_minimum_height_trees.rs
diff --git a/src/n0312_burst_balloons.rs b/src/solution/s0312_burst_balloons.rs
similarity index 100%
rename from src/n0312_burst_balloons.rs
rename to src/solution/s0312_burst_balloons.rs
diff --git a/src/n0313_super_ugly_number.rs b/src/solution/s0313_super_ugly_number.rs
similarity index 100%
rename from src/n0313_super_ugly_number.rs
rename to src/solution/s0313_super_ugly_number.rs
diff --git a/src/n0509_fibonacci_number.rs b/src/solution/s0509_fibonacci_number.rs
similarity index 100%
rename from src/n0509_fibonacci_number.rs
rename to src/solution/s0509_fibonacci_number.rs
diff --git a/src/n0704_binary_search.rs b/src/solution/s0704_binary_search.rs
similarity index 100%
rename from src/n0704_binary_search.rs
rename to src/solution/s0704_binary_search.rs
diff --git a/src/n0969_pancake_sorting.rs b/src/solution/s0969_pancake_sorting.rs
similarity index 100%
rename from src/n0969_pancake_sorting.rs
rename to src/solution/s0969_pancake_sorting.rs
diff --git a/src/n1018_binary_prefix_divisible_by_5.rs b/src/solution/s1018_binary_prefix_divisible_by_5.rs
similarity index 100%
rename from src/n1018_binary_prefix_divisible_by_5.rs
rename to src/solution/s1018_binary_prefix_divisible_by_5.rs
diff --git a/src/n1046_last_stone_weight.rs b/src/solution/s1046_last_stone_weight.rs
similarity index 100%
rename from src/n1046_last_stone_weight.rs
rename to src/solution/s1046_last_stone_weight.rs

From cbfeffbcd533a8a56e9d91a8a3ce45c112fc0da5 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Sun, 2 Feb 2020 13:51:19 +0800
Subject: [PATCH 04/47] =?UTF-8?q?Problem=E5=A2=9E=E5=8A=A0return=20type?=
 =?UTF-8?q?=E5=AD=97=E6=AE=B5?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/problem.rs | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/problem.rs b/src/problem.rs
index d4f7310f..47101b6d 100644
--- a/src/problem.rs
+++ b/src/problem.rs
@@ -43,6 +43,7 @@ pub fn get_problem(frontend_question_id: u32) -> Option<Problem> {
                 sample_test_case: resp.data.question.sample_test_case,
                 difficulty: problem.difficulty.to_string(),
                 question_id: problem.stat.frontend_question_id,
+                return_type: serde_json::from_str(&resp.data.question.meta_data.return_info.type_name).unwrap(),
             });
         }
     }
@@ -64,6 +65,7 @@ pub struct Problem {
     pub sample_test_case: String,
     pub difficulty: String,
     pub question_id: u32,
+    pub return_type: String,
 }
 
 #[derive(Serialize, Deserialize)]
@@ -111,7 +113,21 @@ struct Question {
     #[serde(rename = "sampleTestCase")]
     sample_test_case: String,
     #[serde(rename = "metaData")]
-    meta_data: String,
+    meta_data: MetaData,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+struct MetaData {
+    name:String,
+    params: String,
+    return_info: ReturnInfo,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+struct ReturnInfo {
+    #[serde(rename = "type")]
+    type_name: String,
+    params: String,
 }
 
 #[derive(Debug, Serialize, Deserialize)]

From 70467d4f02dd007725a968c64aee2315afccc862 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Sun, 2 Feb 2020 14:24:57 +0800
Subject: [PATCH 05/47] =?UTF-8?q?=E5=AF=B9=E4=BA=8E=E8=BF=94=E5=9B=9E?=
 =?UTF-8?q?=E7=B1=BB=E5=9E=8B=E4=B8=BAListNode=E7=9A=84=E9=97=AE=E9=A2=98,?=
 =?UTF-8?q?=20=E6=8F=92=E5=85=A5=E9=BB=98=E8=AE=A4=E7=AD=94=E6=A1=88?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 Cargo.lock  | 19 ++++++++++---------
 Cargo.toml  |  1 +
 src/main.rs | 13 ++++++++++++-
 3 files changed, 23 insertions(+), 10 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index d542a78d..69f4ab42 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -448,6 +448,7 @@ name = "leetcode-rust"
 version = "0.1.0"
 dependencies = [
  "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "reqwest 0.9.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -681,7 +682,7 @@ dependencies = [
  "error-chain 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "idna 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -849,18 +850,18 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "regex"
-version = "1.3.1"
+version = "1.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "aho-corasick 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex-syntax 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex-syntax 0.6.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "thread_local 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "regex-syntax"
-version = "0.6.12"
+version = "0.6.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -1071,7 +1072,7 @@ dependencies = [
 
 [[package]]
 name = "thread_local"
-version = "0.3.6"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1454,8 +1455,8 @@ dependencies = [
 "checksum rand_xorshift 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "cbf7e9e623549b0e21f6e97cf8ecf247c1a8fd2e8a992ae265314300b2455d5c"
 "checksum rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "678054eb77286b51581ba43620cc911abf02758c91f93f479767aed0f90458b2"
 "checksum redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)" = "2439c63f3f6139d1b57529d16bc3b8bb855230c8efcc5d3a896c8bea7c3b1e84"
-"checksum regex 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "dc220bd33bdce8f093101afe22a037b8eb0e5af33592e6a9caafff0d4cb81cbd"
-"checksum regex-syntax 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)" = "11a7e20d1cce64ef2fed88b66d347f88bd9babb82845b2b858f3edbf59a4f716"
+"checksum regex 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "322cf97724bea3ee221b78fe25ac9c46114ebb51747ad5babd51a2fc6a8235a8"
+"checksum regex-syntax 0.6.14 (registry+https://github.com/rust-lang/crates.io-index)" = "b28dfe3fe9badec5dbf0a79a9cccad2cfc2ab5484bdb3e44cbd1ae8b3ba2be06"
 "checksum remove_dir_all 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "4a83fa3702a688b9359eccba92d153ac33fd2e8462f9e0e3fdf155239ea7792e"
 "checksum reqwest 0.9.21 (registry+https://github.com/rust-lang/crates.io-index)" = "02b7e953e14c6f3102b7e8d1f1ee3abf5ecee80b427f5565c9389835cecae95c"
 "checksum rustc-demangle 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)" = "4c691c0e608126e00913e33f0ccf3727d5fc84573623b8d65b2df340b5201783"
@@ -1478,7 +1479,7 @@ dependencies = [
 "checksum syn 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "66850e97125af79138385e9b88339cbcd037e3f28ceab8c5ad98e64f0f1f80bf"
 "checksum synstructure 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)" = "02353edf96d6e4dc81aea2d8490a7e9db177bf8acb0e951c24940bf866cb313f"
 "checksum tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e24d9338a0a5be79593e2fa15a648add6138caa803e2d5bc782c371732ca9"
-"checksum thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c6b53e329000edc2b34dbe8545fd20e55a333362d0a321909685a19bd28c3f1b"
+"checksum thread_local 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d40c6d1b69745a6ec6fb1ca717914848da4b44ae29d9b3080cbee91d72a69b14"
 "checksum time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)" = "db8dcfca086c1143c9270ac42a2bbd8a7ee477b78ac8e45b19abfb0cbede4b6f"
 "checksum tokio 0.1.22 (registry+https://github.com/rust-lang/crates.io-index)" = "5a09c0b5bb588872ab2f09afa13ee6e9dac11e10a0ec9e8e3ba39a5a5d530af6"
 "checksum tokio-buf 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "8fb220f46c53859a4b7ec083e41dec9778ff0b1851c0942b211edb89e0ccdc46"
diff --git a/Cargo.toml b/Cargo.toml
index c414242f..f6b7c1c5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,6 +10,7 @@ serde = "1.0"
 serde_json = "1.0"
 serde_derive = "1.0"
 rand = "0.6.5"
+regex = "1.3.4"
 
 [lib]
 doctest = false
diff --git a/src/main.rs b/src/main.rs
index 967c5f85..46cc015c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -10,6 +10,7 @@ use std::fs;
 use std::io;
 use std::io::Write;
 use std::path::Path;
+use regex::Regex;
 
 /// main() helps to generate the submission template .rs
 fn main() {
@@ -74,7 +75,7 @@ fn main() {
         let source = template
             .replace("__PROBLEM_TITLE__", &problem.title)
             .replace("__PROBLEM_DESC__", &build_desc(&problem.content))
-            .replace("__PROBLEM_DEFAULT_CODE__", &code.default_code)
+            .replace("__PROBLEM_DEFAULT_CODE__", &insert_return_in_code(&problem.return_type, &code.default_code))
             .replace("__PROBLEM_ID__", &format!("{}", problem.question_id))
             .replace("__EXTRA_USE__", &parse_extra_use(&code.default_code));
 
@@ -147,6 +148,16 @@ fn parse_extra_use(code: &str) -> String {
     extra_use_line
 }
 
+fn insert_return_in_code(return_type: &str, code: &str) -> String {
+    match return_type {
+        "ListNode" => {
+            let re = Regex::new(r"\{\n +\n +}").unwrap();
+            re.replace(code, format!("{{\n{:8}Some(Box::new(ListNode::new(0)))\n{:4}}}")).to_string()
+        },
+        _ => code
+    }
+}
+
 fn build_desc(content: &str) -> String {
     // TODO: fix this shit
     content

From 23a0241186392082ef835ccc85779c7db5a5e3e6 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Sun, 2 Feb 2020 15:47:01 +0800
Subject: [PATCH 06/47] fix

---
 src/lib.rs                       |  2 +-
 src/main.rs                      |  8 +++---
 src/n0206_reverse_linked_list.rs | 49 --------------------------------
 src/problem.rs                   | 22 ++++----------
 4 files changed, 11 insertions(+), 70 deletions(-)
 delete mode 100644 src/n0206_reverse_linked_list.rs

diff --git a/src/lib.rs b/src/lib.rs
index 815c1ce0..0d8a7e64 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -231,10 +231,10 @@ mod n0199_binary_tree_right_side_view;
 mod n0282_expression_add_operators;
 mod n0021_merge_two_sorted_lists;
 mod n0129_sum_root_to_leaf_numbers;
-mod n0206_reverse_linked_list;
 mod n0131_palindrome_partitioning;
 mod n0307_range_sum_query_mutable;
 mod n0111_minimum_depth_of_binary_tree;
 mod n0092_reverse_linked_list_ii;
 mod n0303_range_sum_query_immutable;
 mod n0102_binary_tree_level_order_traversal;
+mod n0206_reverse_linked_list;
diff --git a/src/main.rs b/src/main.rs
index 46cc015c..1ac97b3b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -150,11 +150,11 @@ fn parse_extra_use(code: &str) -> String {
 
 fn insert_return_in_code(return_type: &str, code: &str) -> String {
     match return_type {
-        "ListNode" => {
-            let re = Regex::new(r"\{\n +\n +}").unwrap();
-            re.replace(code, format!("{{\n{:8}Some(Box::new(ListNode::new(0)))\n{:4}}}")).to_string()
+         "ListNode" => {
+            let re = Regex::new(r"\{[ \n]+}").unwrap();
+            re.replace(&code, "{\n        Some(Box::new(ListNode::new(0)))\n    }").to_string()
         },
-        _ => code
+        _ => code.to_string()
     }
 }
 
diff --git a/src/n0206_reverse_linked_list.rs b/src/n0206_reverse_linked_list.rs
deleted file mode 100644
index bdbe34e4..00000000
--- a/src/n0206_reverse_linked_list.rs
+++ /dev/null
@@ -1,49 +0,0 @@
-/**
- * [206] Reverse Linked List
- *
- * Reverse a singly linked list.
- *
- * Example:
- *
- *
- * Input: 1->2->3->4->5->NULL
- * Output: 5->4->3->2->1->NULL
- *
- *
- * Follow up:
- *
- * A linked list can be reversed either iteratively or recursively. Could you implement both?
- *
- */
-pub struct Solution {}
-use super::util::linked_list::{to_list, ListNode};
-
-// submission codes start here
-
-impl Solution {
-    pub fn reverse_list(head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
-        let mut curr = head;
-        let mut next = None;
-        while let Some(mut inner) = curr {
-            curr = inner.next.take();
-            inner.next = next;
-            next = Some(inner);
-        }
-        next
-    }
-}
-
-// submission codes end
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_206() {
-        assert_eq!(
-            Solution::reverse_list(linked![1, 2, 3, 4, 5]),
-            linked![5, 4, 3, 2, 1]
-        );
-    }
-}
diff --git a/src/problem.rs b/src/problem.rs
index 47101b6d..16209f96 100644
--- a/src/problem.rs
+++ b/src/problem.rs
@@ -2,6 +2,7 @@ extern crate reqwest;
 extern crate serde_json;
 
 use std::fmt::{Display, Error, Formatter};
+use serde_json::Value;
 
 const PROBLEMS_URL: &str = "https://leetcode.com/api/problems/algorithms/";
 const GRAPHQL_URL: &str = "https://leetcode.com/graphql";
@@ -43,7 +44,10 @@ pub fn get_problem(frontend_question_id: u32) -> Option<Problem> {
                 sample_test_case: resp.data.question.sample_test_case,
                 difficulty: problem.difficulty.to_string(),
                 question_id: problem.stat.frontend_question_id,
-                return_type: serde_json::from_str(&resp.data.question.meta_data.return_info.type_name).unwrap(),
+                return_type: {
+                    let v: Value = serde_json::from_str(&resp.data.question.meta_data).unwrap();
+                    v["return"]["type"].to_string().as_str().replace("\"", "").to_string()
+                },
             });
         }
     }
@@ -113,21 +117,7 @@ struct Question {
     #[serde(rename = "sampleTestCase")]
     sample_test_case: String,
     #[serde(rename = "metaData")]
-    meta_data: MetaData,
-}
-
-#[derive(Debug, Serialize, Deserialize)]
-struct MetaData {
-    name:String,
-    params: String,
-    return_info: ReturnInfo,
-}
-
-#[derive(Debug, Serialize, Deserialize)]
-struct ReturnInfo {
-    #[serde(rename = "type")]
-    type_name: String,
-    params: String,
+    meta_data: String,
 }
 
 #[derive(Debug, Serialize, Deserialize)]

From b8b0d94f9ac860d41903b804de70733e1ec9bf32 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Sun, 2 Feb 2020 15:48:42 +0800
Subject: [PATCH 07/47] fix

---
 src/lib.rs | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/lib.rs b/src/lib.rs
index 0d8a7e64..03f472c5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -237,4 +237,3 @@ mod n0111_minimum_depth_of_binary_tree;
 mod n0092_reverse_linked_list_ii;
 mod n0303_range_sum_query_immutable;
 mod n0102_binary_tree_level_order_traversal;
-mod n0206_reverse_linked_list;

From a1971ec56bda0d6bad6fd1e6c9b0fb4c22359320 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Sun, 2 Feb 2020 15:50:27 +0800
Subject: [PATCH 08/47] revert

---
 src/lib.rs                       |  1 +
 src/n0206_reverse_linked_list.rs | 50 ++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)
 create mode 100644 src/n0206_reverse_linked_list.rs

diff --git a/src/lib.rs b/src/lib.rs
index 03f472c5..815c1ce0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -231,6 +231,7 @@ mod n0199_binary_tree_right_side_view;
 mod n0282_expression_add_operators;
 mod n0021_merge_two_sorted_lists;
 mod n0129_sum_root_to_leaf_numbers;
+mod n0206_reverse_linked_list;
 mod n0131_palindrome_partitioning;
 mod n0307_range_sum_query_mutable;
 mod n0111_minimum_depth_of_binary_tree;
diff --git a/src/n0206_reverse_linked_list.rs b/src/n0206_reverse_linked_list.rs
new file mode 100644
index 00000000..90159afa
--- /dev/null
+++ b/src/n0206_reverse_linked_list.rs
@@ -0,0 +1,50 @@
+/**
+ * [206] Reverse Linked List
+ *
+ * Reverse a singly linked list.
+ *
+ * Example:
+ *
+ *
+ * Input: 1->2->3->4->5->NULL
+ * Output: 5->4->3->2->1->NULL
+ *
+ *
+ * Follow up:
+ *
+ * A linked list can be reversed either iteratively or recursively. Could you implement both?
+ *
+ */
+pub struct Solution {}
+
+use super::util::linked_list::{to_list, ListNode};
+
+// submission codes start here
+
+impl Solution {
+    pub fn reverse_list(head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
+        let mut curr = head;
+        let mut next = None;
+        while let Some(mut inner) = curr {
+            curr = inner.next.take();
+            inner.next = next;
+            next = Some(inner);
+        }
+        next
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_206() {
+        assert_eq!(
+            Solution::reverse_list(linked![1, 2, 3, 4, 5]),
+            linked![5, 4, 3, 2, 1]
+        );
+    }
+}

From e150ee18cbfe562dc7195ebe082b06d69ab9f3f2 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Sun, 2 Feb 2020 18:08:17 +0800
Subject: [PATCH 09/47] add default return value

---
 src/main.rs | 49 ++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 42 insertions(+), 7 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 1ac97b3b..12bbdb62 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,12 +5,12 @@ extern crate serde_json;
 
 mod problem;
 
+use regex::Regex;
 use std::env;
 use std::fs;
 use std::io;
 use std::io::Write;
 use std::path::Path;
-use regex::Regex;
 
 /// main() helps to generate the submission template .rs
 fn main() {
@@ -75,7 +75,10 @@ fn main() {
         let source = template
             .replace("__PROBLEM_TITLE__", &problem.title)
             .replace("__PROBLEM_DESC__", &build_desc(&problem.content))
-            .replace("__PROBLEM_DEFAULT_CODE__", &insert_return_in_code(&problem.return_type, &code.default_code))
+            .replace(
+                "__PROBLEM_DEFAULT_CODE__",
+                &insert_return_in_code(&problem.return_type, &code.default_code),
+            )
             .replace("__PROBLEM_ID__", &format!("{}", problem.question_id))
             .replace("__EXTRA_USE__", &parse_extra_use(&code.default_code));
 
@@ -149,12 +152,44 @@ fn parse_extra_use(code: &str) -> String {
 }
 
 fn insert_return_in_code(return_type: &str, code: &str) -> String {
+    let re = Regex::new(r"\{[ \n]+}").unwrap();
     match return_type {
-         "ListNode" => {
-            let re = Regex::new(r"\{[ \n]+}").unwrap();
-            re.replace(&code, "{\n        Some(Box::new(ListNode::new(0)))\n    }").to_string()
-        },
-        _ => code.to_string()
+        "ListNode" => re
+            .replace(&code, "{\n        Some(Box::new(ListNode::new(0)))\n    }")
+            .to_string(),
+        "ListNode[]" => re.replace(&code, "{\n        vec![]\n    }").to_string(),
+        "TreeNode" => re
+            .replace(
+                &code,
+                "{\n        Some(Rc::new(RefCell::new(TreeNode::new(0))))\n    }",
+            )
+            .to_string(),
+        "boolean" => re.replace(&code, "{\n        false\n    }").to_string(),
+        "character" => re.replace(&code, "{\n        '0'\n    }").to_string(),
+        "character[][]" => re.replace(&code, "{\n        vec![]\n    }").to_string(),
+        "double" => re.replace(&code, "{\n        0f64\n    }").to_string(),
+        "double[]" => re.replace(&code, "{\n        vec![]\n    }").to_string(),
+        "int[]" => re.replace(&code, "{\n        vec![]\n    }").to_string(),
+        "integer" => re.replace(&code, "{\n        0\n    }").to_string(),
+        "integer[]" => re.replace(&code, "{\n        vec![]\n    }").to_string(),
+        "integer[][]" => re.replace(&code, "{\n        vec![]\n    }").to_string(),
+        "list<String>" => re.replace(&code, "{\n        vec![]\n    }").to_string(),
+        "list<TreeNode>" => re.replace(&code, "{\n        vec![]\n    }").to_string(),
+        "list<boolean>" => re.replace(&code, "{\n        vec![]\n    }").to_string(),
+        "list<double>" => re.replace(&code, "{\n        vec![]\n    }").to_string(),
+        "list<integer>" => re.replace(&code, "{\n        vec![]\n    }").to_string(),
+        "list<list<integer>>" => re.replace(&code, "{\n        vec![]\n    }").to_string(),
+        "list<list<string>>" => re.replace(&code, "{\n        vec![]\n    }").to_string(),
+        "list<string>" => re.replace(&code, "{\n        vec![]\n    }").to_string(),
+        "null" => code.to_string(),
+        "string" => re
+            .replace(&code, "{\n        String::new()\n    }")
+            .to_string(),
+        "string[]" => re.replace(&code, "{\n        vec![]\n    }").to_string(),
+        "void" => code.to_string(),
+        "NestedInteger" => code.to_string(),
+        "Node" => code.to_string(),
+        _ => code.to_string(),
     }
 }
 

From d0d889afe69526ea108e3ffcb2e8d5cba02a1a96 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Sun, 2 Feb 2020 18:16:33 +0800
Subject: [PATCH 10/47] remove

---
 src/n0206_reverse_linked_list.rs | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/n0206_reverse_linked_list.rs b/src/n0206_reverse_linked_list.rs
index 90159afa..bdbe34e4 100644
--- a/src/n0206_reverse_linked_list.rs
+++ b/src/n0206_reverse_linked_list.rs
@@ -16,7 +16,6 @@
  *
  */
 pub struct Solution {}
-
 use super::util::linked_list::{to_list, ListNode};
 
 // submission codes start here

From 01ce862f8526b43ee73bd1c51df25bc4e4344947 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Sun, 2 Feb 2020 18:33:22 +0800
Subject: [PATCH 11/47] fix

---
 src/main.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index e25be217..ccd0c491 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -116,7 +116,7 @@ fn generate_random_id(except_ids: &[u32]) -> u32 {
 }
 
 fn get_solved_ids() -> Vec<u32> {
-    let paths = fs::read_dir("./src").unwrap();
+    let paths = fs::read_dir("./src/problem").unwrap();
     let mut solved_ids = Vec::new();
 
     for path in paths {

From 360a3f47895a049679128b4c0b2c96e31e444f8c Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Sun, 2 Feb 2020 18:35:23 +0800
Subject: [PATCH 12/47] fix

---
 src/main.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index ccd0c491..3533f9d5 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -37,7 +37,7 @@ fn main() {
                     .unwrap_or_else(|_| panic!("not a number: {}", id_arg));
                 if solved_ids.contains(&id) {
                     println!(
-                        "The problem you chose is invalid (the problem may have been solved \
+                        "The problem you chose is invalid (the problem may have been downloaded \
                          or may have no rust version)."
                     );
                     continue;

From f90c44eef14a18986851d26af39ceccaad17718b Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Sun, 2 Feb 2020 18:36:04 +0800
Subject: [PATCH 13/47] fix

---
 src/main.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index 3533f9d5..3501fe34 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -37,7 +37,7 @@ fn main() {
                     .unwrap_or_else(|_| panic!("not a number: {}", id_arg));
                 if solved_ids.contains(&id) {
                     println!(
-                        "The problem you chose is invalid (the problem may have been downloaded \
+                        "The problem you chose is invalid (the problem may have been initialized \
                          or may have no rust version)."
                     );
                     continue;

From 9f05e1fb83c1ba3f6976f587ce617c225bf2eb5b Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Sun, 2 Feb 2020 20:37:35 +0800
Subject: [PATCH 14/47] add option to solve problem

---
 Cargo.lock  | 19 ++++++------
 Cargo.toml  |  1 +
 src/main.rs | 88 +++++++++++++++++++++++++++++++++++++++++------------
 3 files changed, 80 insertions(+), 28 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index d542a78d..69f4ab42 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -448,6 +448,7 @@ name = "leetcode-rust"
 version = "0.1.0"
 dependencies = [
  "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "reqwest 0.9.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -681,7 +682,7 @@ dependencies = [
  "error-chain 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "idna 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -849,18 +850,18 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "regex"
-version = "1.3.1"
+version = "1.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "aho-corasick 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex-syntax 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex-syntax 0.6.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "thread_local 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "regex-syntax"
-version = "0.6.12"
+version = "0.6.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -1071,7 +1072,7 @@ dependencies = [
 
 [[package]]
 name = "thread_local"
-version = "0.3.6"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1454,8 +1455,8 @@ dependencies = [
 "checksum rand_xorshift 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "cbf7e9e623549b0e21f6e97cf8ecf247c1a8fd2e8a992ae265314300b2455d5c"
 "checksum rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "678054eb77286b51581ba43620cc911abf02758c91f93f479767aed0f90458b2"
 "checksum redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)" = "2439c63f3f6139d1b57529d16bc3b8bb855230c8efcc5d3a896c8bea7c3b1e84"
-"checksum regex 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "dc220bd33bdce8f093101afe22a037b8eb0e5af33592e6a9caafff0d4cb81cbd"
-"checksum regex-syntax 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)" = "11a7e20d1cce64ef2fed88b66d347f88bd9babb82845b2b858f3edbf59a4f716"
+"checksum regex 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "322cf97724bea3ee221b78fe25ac9c46114ebb51747ad5babd51a2fc6a8235a8"
+"checksum regex-syntax 0.6.14 (registry+https://github.com/rust-lang/crates.io-index)" = "b28dfe3fe9badec5dbf0a79a9cccad2cfc2ab5484bdb3e44cbd1ae8b3ba2be06"
 "checksum remove_dir_all 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "4a83fa3702a688b9359eccba92d153ac33fd2e8462f9e0e3fdf155239ea7792e"
 "checksum reqwest 0.9.21 (registry+https://github.com/rust-lang/crates.io-index)" = "02b7e953e14c6f3102b7e8d1f1ee3abf5ecee80b427f5565c9389835cecae95c"
 "checksum rustc-demangle 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)" = "4c691c0e608126e00913e33f0ccf3727d5fc84573623b8d65b2df340b5201783"
@@ -1478,7 +1479,7 @@ dependencies = [
 "checksum syn 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "66850e97125af79138385e9b88339cbcd037e3f28ceab8c5ad98e64f0f1f80bf"
 "checksum synstructure 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)" = "02353edf96d6e4dc81aea2d8490a7e9db177bf8acb0e951c24940bf866cb313f"
 "checksum tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e24d9338a0a5be79593e2fa15a648add6138caa803e2d5bc782c371732ca9"
-"checksum thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c6b53e329000edc2b34dbe8545fd20e55a333362d0a321909685a19bd28c3f1b"
+"checksum thread_local 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d40c6d1b69745a6ec6fb1ca717914848da4b44ae29d9b3080cbee91d72a69b14"
 "checksum time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)" = "db8dcfca086c1143c9270ac42a2bbd8a7ee477b78ac8e45b19abfb0cbede4b6f"
 "checksum tokio 0.1.22 (registry+https://github.com/rust-lang/crates.io-index)" = "5a09c0b5bb588872ab2f09afa13ee6e9dac11e10a0ec9e8e3ba39a5a5d530af6"
 "checksum tokio-buf 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "8fb220f46c53859a4b7ec083e41dec9778ff0b1851c0942b211edb89e0ccdc46"
diff --git a/Cargo.toml b/Cargo.toml
index c414242f..f6b7c1c5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,6 +10,7 @@ serde = "1.0"
 serde_json = "1.0"
 serde_derive = "1.0"
 rand = "0.6.5"
+regex = "1.3.4"
 
 [lib]
 doctest = false
diff --git a/src/main.rs b/src/main.rs
index 3501fe34..9c3fd6d7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,10 +5,12 @@ extern crate serde_json;
 
 mod fetcher;
 
+use regex::Regex;
 use std::env;
 use std::fs;
+use std::fs::File;
 use std::io;
-use std::io::Write;
+use std::io::{BufRead, Write};
 use std::path::Path;
 
 /// main() helps to generate the submission template .rs
@@ -18,30 +20,44 @@ fn main() {
     loop {
         println!("Please enter a frontend problem id, or \"random\" to generate a random one.");
         let mut is_random = false;
+        let mut is_solving = false;
         let mut id: u32 = 0;
         let mut id_arg = String::new();
         io::stdin()
             .read_line(&mut id_arg)
             .expect("Failed to read line");
         let id_arg = id_arg.trim();
-        match id_arg {
-            "random" => {
-                println!("You select random mode.");
-                id = generate_random_id(&solved_ids);
-                is_random = true;
-                println!("Generate random problem: {}", &id);
-            }
-            _ => {
-                id = id_arg
-                    .parse::<u32>()
-                    .unwrap_or_else(|_| panic!("not a number: {}", id_arg));
-                if solved_ids.contains(&id) {
-                    println!(
-                        "The problem you chose is invalid (the problem may have been initialized \
-                         or may have no rust version)."
-                    );
-                    continue;
-                }
+
+        let random_pattern = Regex::new(r"^random$").unwrap();
+        let solving_pattern = Regex::new(r"^solve (\d+)$").unwrap();
+
+        if random_pattern.is_match(id_arg) {
+            println!("You select random mode.");
+            id = generate_random_id(&solved_ids);
+            is_random = true;
+            println!("Generate random problem: {}", &id);
+        } else if solving_pattern.is_match(id_arg) {
+            // solve a problem
+            // move it from problem/ to solution/
+            is_solving = true;
+            id = solving_pattern
+                .captures(id_arg)
+                .unwrap()
+                .get(1)
+                .unwrap()
+                .as_str()
+                .parse()
+                .unwrap();
+        } else {
+            id = id_arg
+                .parse::<u32>()
+                .unwrap_or_else(|_| panic!("not a number: {}", id_arg));
+            if solved_ids.contains(&id) {
+                println!(
+                    "The problem you chose is invalid (the problem may have been initialized \
+                     or may have no rust version)."
+                );
+                continue;
             }
         }
 
@@ -66,6 +82,40 @@ fn main() {
             problem.title_slug.replace("-", "_")
         );
         let file_path = Path::new("./src/problem").join(format!("{}.rs", file_name));
+        if is_solving {
+            // check problem/ existence
+            if !file_path.exists() {
+                panic!("problem does not exist");
+            }
+            // check solution/ no existence
+            let solution_name = format!(
+                "s{:04}_{}",
+                problem.question_id,
+                problem.title_slug.replace("-", "_")
+            );
+            let solution_path = Path::new("./src/solution").join(format!("{}.rs", solution_name));
+            if solution_path.exists() {
+                panic!("solution exists");
+            }
+            // rename/move file
+            fs::rename(file_path, solution_path).unwrap();
+            // remove from problem/mod.rs
+            let mod_file = "./src/problem/mod.rs";
+            let target_line = format!("mod {};", file_name);
+            let lines: Vec<String> = io::BufReader::new(File::open(mod_file).unwrap())
+                .lines()
+                .map(|x| x.unwrap())
+                .filter(|x| *x != target_line)
+                .collect();
+            fs::write(mod_file, lines.join("\n"));
+            // insert into solution/mod.rs
+            let mut lib_file = fs::OpenOptions::new()
+                .append(true)
+                .open("./src/solution/mod.rs")
+                .unwrap();
+            writeln!(lib_file, "mod {};", solution_name);
+            break;
+        }
         if file_path.exists() {
             panic!("problem already initialized");
         }

From 8a06a5938f7dbf69226ab8a0ee0308f0da43ff28 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Sun, 2 Feb 2020 21:16:15 +0800
Subject: [PATCH 15/47] fix

---
 src/problem.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/problem.rs b/src/problem.rs
index 16209f96..a60fb39e 100644
--- a/src/problem.rs
+++ b/src/problem.rs
@@ -1,8 +1,8 @@
 extern crate reqwest;
 extern crate serde_json;
 
-use std::fmt::{Display, Error, Formatter};
 use serde_json::Value;
+use std::fmt::{Display, Error, Formatter};
 
 const PROBLEMS_URL: &str = "https://leetcode.com/api/problems/algorithms/";
 const GRAPHQL_URL: &str = "https://leetcode.com/graphql";
@@ -46,7 +46,7 @@ pub fn get_problem(frontend_question_id: u32) -> Option<Problem> {
                 question_id: problem.stat.frontend_question_id,
                 return_type: {
                     let v: Value = serde_json::from_str(&resp.data.question.meta_data).unwrap();
-                    v["return"]["type"].to_string().as_str().replace("\"", "").to_string()
+                    v["return"]["type"].to_string().replace("\"", "")
                 },
             });
         }

From 0d72e628b6c6b11cc5edca9725e3d505fcc7c355 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Tue, 4 Feb 2020 10:57:03 +0800
Subject: [PATCH 16/47] add a message to explain the solve $i command

---
 src/main.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index 9c3fd6d7..f58192c0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -18,7 +18,7 @@ fn main() {
     println!("Welcome to leetcode-rust system.");
     let mut solved_ids = get_solved_ids();
     loop {
-        println!("Please enter a frontend problem id, or \"random\" to generate a random one.");
+        println!("Please enter a frontend problem id, or \"random\" to generate a random one, or \"solve $i\" to move problem to solution/");
         let mut is_random = false;
         let mut is_solving = false;
         let mut id: u32 = 0;

From 125c64c39b035d4cab2687d9bc2977749c8b0a59 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Tue, 4 Feb 2020 11:06:16 +0800
Subject: [PATCH 17/47] clarify error message

---
 src/main.rs | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index f58192c0..87c333fc 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -53,10 +53,7 @@ fn main() {
                 .parse::<u32>()
                 .unwrap_or_else(|_| panic!("not a number: {}", id_arg));
             if solved_ids.contains(&id) {
-                println!(
-                    "The problem you chose is invalid (the problem may have been initialized \
-                     or may have no rust version)."
-                );
+                println!("The problem you chose has been initialized in problem/");
                 continue;
             }
         }

From 76edb8c5fb172de61a1e308d279e9b877ad32c5f Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Tue, 4 Feb 2020 11:24:08 +0800
Subject: [PATCH 18/47] refactor get_solved_ids() according to current logic

---
 src/main.rs | 20 ++++++--------------
 1 file changed, 6 insertions(+), 14 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 87c333fc..545c2d22 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -163,20 +163,12 @@ fn generate_random_id(except_ids: &[u32]) -> u32 {
 }
 
 fn get_solved_ids() -> Vec<u32> {
-    let paths = fs::read_dir("./src/problem").unwrap();
-    let mut solved_ids = Vec::new();
-
-    for path in paths {
-        let path = path.unwrap().path();
-        let s = path.to_str().unwrap();
-        if !s.starts_with('n') {
-            continue;
-        }
-        let id = &s[7..11];
-        let id = id.parse::<u32>().unwrap();
-        solved_ids.push(id);
-    }
-    solved_ids
+    let content = fs::read_to_string("./src/problem/mod.rs").unwrap();
+    let id_pattern = Regex::new(r"p(\d{4})_").unwrap();
+    id_pattern
+        .captures_iter(&content)
+        .map(|x| x.get(1).unwrap().as_str().parse().unwrap())
+        .collect()
 }
 
 fn parse_extra_use(code: &str) -> String {

From 695f53a684264b19f0d2e94541fdb18cc1f37628 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Tue, 4 Feb 2020 11:28:00 +0800
Subject: [PATCH 19/47] clarify var and fn name

---
 src/main.rs | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 545c2d22..cf5d251b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -16,7 +16,7 @@ use std::path::Path;
 /// main() helps to generate the submission template .rs
 fn main() {
     println!("Welcome to leetcode-rust system.");
-    let mut solved_ids = get_solved_ids();
+    let mut initialized_ids = get_initialized_ids();
     loop {
         println!("Please enter a frontend problem id, or \"random\" to generate a random one, or \"solve $i\" to move problem to solution/");
         let mut is_random = false;
@@ -33,7 +33,7 @@ fn main() {
 
         if random_pattern.is_match(id_arg) {
             println!("You select random mode.");
-            id = generate_random_id(&solved_ids);
+            id = generate_random_id(&initialized_ids);
             is_random = true;
             println!("Generate random problem: {}", &id);
         } else if solving_pattern.is_match(id_arg) {
@@ -52,7 +52,7 @@ fn main() {
             id = id_arg
                 .parse::<u32>()
                 .unwrap_or_else(|_| panic!("not a number: {}", id_arg));
-            if solved_ids.contains(&id) {
+            if initialized_ids.contains(&id) {
                 println!("The problem you chose has been initialized in problem/");
                 continue;
             }
@@ -68,7 +68,7 @@ fn main() {
         let code = problem.code_definition.iter().find(|&d| d.value == "rust");
         if code.is_none() {
             println!("Problem {} has no rust version.", &id);
-            solved_ids.push(problem.question_id);
+            initialized_ids.push(problem.question_id);
             continue;
         }
         let code = code.unwrap();
@@ -162,7 +162,7 @@ fn generate_random_id(except_ids: &[u32]) -> u32 {
     }
 }
 
-fn get_solved_ids() -> Vec<u32> {
+fn get_initialized_ids() -> Vec<u32> {
     let content = fs::read_to_string("./src/problem/mod.rs").unwrap();
     let id_pattern = Regex::new(r"p(\d{4})_").unwrap();
     id_pattern

From bc6fb496f8cd0caacf806c80b599b72ff4137a79 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Fri, 7 Feb 2020 14:10:59 +0800
Subject: [PATCH 20/47] extract solving logic

---
 src/main.rs | 76 +++++++++++++++++++++++++++++------------------------
 1 file changed, 42 insertions(+), 34 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 35bb8363..68776113 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -48,6 +48,7 @@ fn main() {
                 .as_str()
                 .parse()
                 .unwrap();
+            deal_solving(&id);
         } else {
             id = id_arg
                 .parse::<u32>()
@@ -79,40 +80,6 @@ fn main() {
             problem.title_slug.replace("-", "_")
         );
         let file_path = Path::new("./src/problem").join(format!("{}.rs", file_name));
-        if is_solving {
-            // check problem/ existence
-            if !file_path.exists() {
-                panic!("problem does not exist");
-            }
-            // check solution/ no existence
-            let solution_name = format!(
-                "s{:04}_{}",
-                problem.question_id,
-                problem.title_slug.replace("-", "_")
-            );
-            let solution_path = Path::new("./src/solution").join(format!("{}.rs", solution_name));
-            if solution_path.exists() {
-                panic!("solution exists");
-            }
-            // rename/move file
-            fs::rename(file_path, solution_path).unwrap();
-            // remove from problem/mod.rs
-            let mod_file = "./src/problem/mod.rs";
-            let target_line = format!("mod {};", file_name);
-            let lines: Vec<String> = io::BufReader::new(File::open(mod_file).unwrap())
-                .lines()
-                .map(|x| x.unwrap())
-                .filter(|x| *x != target_line)
-                .collect();
-            fs::write(mod_file, lines.join("\n"));
-            // insert into solution/mod.rs
-            let mut lib_file = fs::OpenOptions::new()
-                .append(true)
-                .open("./src/solution/mod.rs")
-                .unwrap();
-            writeln!(lib_file, "mod {};", solution_name);
-            break;
-        }
         if file_path.exists() {
             panic!("problem already initialized");
         }
@@ -265,3 +232,44 @@ fn build_desc(content: &str) -> String {
         .replace("\n\n", "\n")
         .replace("\n", "\n * ")
 }
+
+fn deal_solving(id: &u32) {
+    let problem = fetcher::get_problem(*id).unwrap();
+    let file_name = format!(
+        "p{:04}_{}",
+        problem.question_id,
+        problem.title_slug.replace("-", "_")
+    );
+    let file_path = Path::new("./src/problem").join(format!("{}.rs", file_name));
+    // check problem/ existence
+    if !file_path.exists() {
+        panic!("problem does not exist");
+    }
+    // check solution/ no existence
+    let solution_name = format!(
+        "s{:04}_{}",
+        problem.question_id,
+        problem.title_slug.replace("-", "_")
+    );
+    let solution_path = Path::new("./src/solution").join(format!("{}.rs", solution_name));
+    if solution_path.exists() {
+        panic!("solution exists");
+    }
+    // rename/move file
+    fs::rename(file_path, solution_path).unwrap();
+    // remove from problem/mod.rs
+    let mod_file = "./src/problem/mod.rs";
+    let target_line = format!("mod {};", file_name);
+    let lines: Vec<String> = io::BufReader::new(File::open(mod_file).unwrap())
+        .lines()
+        .map(|x| x.unwrap())
+        .filter(|x| *x != target_line)
+        .collect();
+    fs::write(mod_file, lines.join("\n"));
+    // insert into solution/mod.rs
+    let mut lib_file = fs::OpenOptions::new()
+        .append(true)
+        .open("./src/solution/mod.rs")
+        .unwrap();
+    writeln!(lib_file, "mod {};", solution_name);
+}

From b3d28ecd485350fe584308ca1a1584663bf94ed3 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Fri, 7 Feb 2020 14:16:02 +0800
Subject: [PATCH 21/47] fix

---
 src/main.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/main.rs b/src/main.rs
index 68776113..de4129e7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -49,6 +49,7 @@ fn main() {
                 .parse()
                 .unwrap();
             deal_solving(&id);
+            break;
         } else {
             id = id_arg
                 .parse::<u32>()

From 77a6accae94c94f37ec2d7b95bcc21e46d7b34c5 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Fri, 7 Feb 2020 14:20:38 +0800
Subject: [PATCH 22/47] extract problem dealing logic

---
 src/main.rs | 80 ++++++++++++++++++++++++++++-------------------------
 1 file changed, 42 insertions(+), 38 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index de4129e7..677fb3d6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,6 +5,7 @@ extern crate serde_json;
 
 mod fetcher;
 
+use crate::fetcher::{CodeDefinition, Problem};
 use regex::Regex;
 use std::env;
 use std::fs;
@@ -74,44 +75,7 @@ fn main() {
             continue;
         }
         let code = code.unwrap();
-
-        let file_name = format!(
-            "p{:04}_{}",
-            problem.question_id,
-            problem.title_slug.replace("-", "_")
-        );
-        let file_path = Path::new("./src/problem").join(format!("{}.rs", file_name));
-        if file_path.exists() {
-            panic!("problem already initialized");
-        }
-
-        let template = fs::read_to_string("./template.rs").unwrap();
-        let source = template
-            .replace("__PROBLEM_TITLE__", &problem.title)
-            .replace("__PROBLEM_DESC__", &build_desc(&problem.content))
-            .replace(
-                "__PROBLEM_DEFAULT_CODE__",
-                &insert_return_in_code(&problem.return_type, &code.default_code),
-            )
-            .replace("__PROBLEM_ID__", &format!("{}", problem.question_id))
-            .replace("__EXTRA_USE__", &parse_extra_use(&code.default_code));
-
-        let mut file = fs::OpenOptions::new()
-            .write(true)
-            .create(true)
-            .truncate(true)
-            .open(&file_path)
-            .unwrap();
-
-        file.write_all(source.as_bytes()).unwrap();
-        drop(file);
-
-        let mut lib_file = fs::OpenOptions::new()
-            .write(true)
-            .append(true)
-            .open("./src/problem/mod.rs")
-            .unwrap();
-        writeln!(lib_file, "mod {};", file_name);
+        deal_problem(&problem, &code);
         break;
     }
 }
@@ -274,3 +238,43 @@ fn deal_solving(id: &u32) {
         .unwrap();
     writeln!(lib_file, "mod {};", solution_name);
 }
+
+fn deal_problem(problem: &Problem, code: &CodeDefinition) {
+    let file_name = format!(
+        "p{:04}_{}",
+        problem.question_id,
+        problem.title_slug.replace("-", "_")
+    );
+    let file_path = Path::new("./src/problem").join(format!("{}.rs", file_name));
+    if file_path.exists() {
+        panic!("problem already initialized");
+    }
+
+    let template = fs::read_to_string("./template.rs").unwrap();
+    let source = template
+        .replace("__PROBLEM_TITLE__", &problem.title)
+        .replace("__PROBLEM_DESC__", &build_desc(&problem.content))
+        .replace(
+            "__PROBLEM_DEFAULT_CODE__",
+            &insert_return_in_code(&problem.return_type, &code.default_code),
+        )
+        .replace("__PROBLEM_ID__", &format!("{}", problem.question_id))
+        .replace("__EXTRA_USE__", &parse_extra_use(&code.default_code));
+
+    let mut file = fs::OpenOptions::new()
+        .write(true)
+        .create(true)
+        .truncate(true)
+        .open(&file_path)
+        .unwrap();
+
+    file.write_all(source.as_bytes()).unwrap();
+    drop(file);
+
+    let mut lib_file = fs::OpenOptions::new()
+        .write(true)
+        .append(true)
+        .open("./src/problem/mod.rs")
+        .unwrap();
+    writeln!(lib_file, "mod {};", file_name);
+}

From 0d9c9f98bdf6b78cd83b995ba430e44b20cbdb11 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Fri, 7 Feb 2020 14:51:13 +0800
Subject: [PATCH 23/47] make code work

---
 Cargo.lock     | 486 +++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml     |   2 +
 src/fetcher.rs |  50 ++++-
 src/main.rs    |  41 ++++-
 4 files changed, 574 insertions(+), 5 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 69f4ab42..a282f353 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -13,6 +13,11 @@ dependencies = [
  "memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "anyhow"
+version = "1.0.26"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "arrayvec"
 version = "0.4.11"
@@ -59,6 +64,11 @@ name = "bitflags"
 version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "bumpalo"
+version = "3.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "byteorder"
 version = "1.3.2"
@@ -149,6 +159,14 @@ dependencies = [
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "crossbeam-channel"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-utils 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "crossbeam-deque"
 version = "0.7.1"
@@ -188,6 +206,35 @@ dependencies = [
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "curl"
+version = "0.4.25"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "curl-sys 0.4.25 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.62 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl-probe 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl-sys 0.9.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "schannel 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "socket2 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "curl-sys"
+version = "0.4.25"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cc 1.0.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.62 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libnghttp2-sys 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libz-sys 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl-sys 0.9.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "vcpkg 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "dtoa"
 version = "0.4.4"
@@ -288,6 +335,48 @@ name = "futures"
 version = "0.1.29"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "futures"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures-channel 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-executor 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-io 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-sink 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-task 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-util 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "futures-channel"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-sink 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "futures-channel-preview"
+version = "0.3.0-alpha.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures-core-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-sink-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "futures-core"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "futures-core-preview"
+version = "0.3.0-alpha.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "futures-cpupool"
 version = "0.1.8"
@@ -297,6 +386,110 @@ dependencies = [
  "num_cpus 1.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "futures-executor"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-task 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-util 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num_cpus 1.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "futures-executor-preview"
+version = "0.3.0-alpha.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures-core-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-util-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num_cpus 1.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "futures-io"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "futures-io-preview"
+version = "0.3.0-alpha.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "futures-macro"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro-hack 0.5.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "futures-preview"
+version = "0.3.0-alpha.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures-channel-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-executor-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-io-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-sink-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-util-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "futures-sink"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "futures-sink-preview"
+version = "0.3.0-alpha.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "futures-task"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "futures-util"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures-channel 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-io 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-macro 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-sink 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-task 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pin-utils 0.1.0-alpha.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro-hack 0.5.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro-nested 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "futures-util-preview"
+version = "0.3.0-alpha.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-channel-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-io-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-sink-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pin-utils 0.1.0-alpha.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "getrandom"
 version = "0.1.12"
@@ -324,6 +517,14 @@ dependencies = [
  "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "heck"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "unicode-segmentation 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "http"
 version = "0.1.18"
@@ -424,11 +625,38 @@ dependencies = [
  "libc 0.2.62 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "isahc"
+version = "0.7.6"
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+ "crossbeam-channel 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "curl 0.4.25 (registry+https://github.com/rust-lang/crates.io-index)",
+ "curl-sys 0.4.25 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-io-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-util-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sluice 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
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+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "wasm-bindgen 0.2.58 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "kernel32-sys"
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@@ -447,12 +675,14 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "leetcode-rust"
 version = "0.1.0"
 dependencies = [
+ "futures 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
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  "serde_json 1.0.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "surf 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -460,6 +690,26 @@ name = "libc"
 version = "0.2.62"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "libnghttp2-sys"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cc 1.0.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.62 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
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+ "cc 1.0.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.62 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "vcpkg 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
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@@ -576,6 +826,15 @@ name = "nodrop"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
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@@ -648,6 +907,11 @@ name = "percent-encoding"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "pin-utils"
+version = "0.1.0-alpha.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
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@@ -658,6 +922,21 @@ name = "ppv-lite86"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "proc-macro-hack"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
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@@ -1008,16 +1287,53 @@ dependencies = [
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 ]
 
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "serde 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
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+[[package]]
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+ "futures-core-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-io-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
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+
 [[package]]
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+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
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+ "libc 0.2.62 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+
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@@ -1026,6 +1342,27 @@ dependencies = [
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 ]
 
+[[package]]
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+ "url 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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+ "web-sys 0.3.35 (registry+https://github.com/rust-lang/crates.io-index)",
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+
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@@ -1248,6 +1585,11 @@ dependencies = [
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+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+
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@@ -1311,6 +1653,105 @@ name = "wasi"
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+"checksum futures-executor 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "f674f3e1bcb15b37284a90cedf55afdba482ab061c407a9c0ebbd0f3109741ba"
+"checksum futures-executor-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)" = "75236e88bd9fe88e5e8bfcd175b665d0528fe03ca4c5207fabc028c8f9d93e98"
+"checksum futures-io 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "a638959aa96152c7a4cddf50fcb1e3fede0583b27157c26e67d6f99904090dc6"
+"checksum futures-io-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)" = "f4914ae450db1921a56c91bde97a27846287d062087d4a652efc09bb3a01ebda"
+"checksum futures-macro 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "9a5081aa3de1f7542a794a397cde100ed903b0630152d0973479018fd85423a7"
+"checksum futures-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)" = "3b1dce2a0267ada5c6ff75a8ba864b4e679a9e2aa44262af7a3b5516d530d76e"
+"checksum futures-sink 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "3466821b4bc114d95b087b850a724c6f83115e929bc88f1fa98a3304a944c8a6"
+"checksum futures-sink-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)" = "86f148ef6b69f75bb610d4f9a2336d4fc88c4b5b67129d1a340dd0fd362efeec"
+"checksum futures-task 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "7b0a34e53cf6cdcd0178aa573aed466b646eb3db769570841fda0c7ede375a27"
+"checksum futures-util 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "22766cf25d64306bedf0384da004d05c9974ab104fcc4528f1236181c18004c5"
+"checksum futures-util-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)" = "5ce968633c17e5f97936bd2797b6e38fb56cf16a7422319f7ec2e30d3c470e8d"
 "checksum getrandom 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)" = "473a1265acc8ff1e808cd0a1af8cee3c2ee5200916058a2ca113c29f2d903571"
 "checksum h2 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)" = "a5b34c246847f938a410a03c5458c7fee2274436675e76d8b903c08efc29c462"
+"checksum heck 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "20564e78d53d2bb135c343b3f47714a56af2061f1c928fdb541dc7b9fdd94205"
 "checksum http 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)" = "372bcb56f939e449117fb0869c2e8fd8753a8223d92a172c6e808cf123a5b6e4"
 "checksum http-body 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "6741c859c1b2463a423a1dbce98d418e6c3c3fc720fb0d45528657320920292d"
 "checksum httparse 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "cd179ae861f0c2e53da70d892f5f3029f9594be0c41dc5269cd371691b1dc2f9"
@@ -1407,10 +1870,14 @@ dependencies = [
 "checksum idna 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "02e2673c30ee86b5b96a9cb52ad15718aa1f966f5ab9ad54a8b95d5ca33120a9"
 "checksum indexmap 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a61202fbe46c4a951e9404a720a0180bcf3212c750d735cb5c4ba4dc551299f3"
 "checksum iovec 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "c9636900aa73ffed13cdbb199f17cd955670bb300927c8d25b517dfa136b6567"
+"checksum isahc 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)" = "17b77027f12e53ae59a379f7074259d32eb10867e6183388020e922832d9c3fb"
 "checksum itoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)" = "501266b7edd0174f8530248f87f99c88fbe60ca4ef3dd486835b8d8d53136f7f"
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 "checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
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 "checksum libc 0.2.62 (registry+https://github.com/rust-lang/crates.io-index)" = "34fcd2c08d2f832f376f4173a231990fa5aef4e99fb569867318a227ef4c06ba"
+"checksum libnghttp2-sys 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "02254d44f4435dd79e695f2c2b83cd06a47919adea30216ceaf0c57ca0a72463"
+"checksum libz-sys 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)" = "2eb5e43362e38e2bca2fd5f5134c4d4564a23a5c28e9b95411652021a8675ebe"
 "checksum lock_api 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "f8912e782533a93a167888781b836336a6ca5da6175c05944c86cf28c31104dc"
 "checksum log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)" = "14b6052be84e6b71ab17edffc2eeabf5c2c3ae1fdb464aae35ac50c67a44e1f7"
 "checksum matches 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "7ffc5c5338469d4d3ea17d269fa8ea3512ad247247c30bd2df69e68309ed0a08"
@@ -1424,6 +1891,7 @@ dependencies = [
 "checksum native-tls 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "4b2df1a4c22fd44a62147fd8f13dd0f95c9d8ca7b2610299b2a2f9cf8964274e"
 "checksum net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)" = "42550d9fb7b6684a6d404d9fa7250c2eb2646df731d1c06afc06dcee9e1bcf88"
 "checksum nodrop 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)" = "2f9667ddcc6cc8a43afc9b7917599d7216aa09c463919ea32c59ed6cac8bc945"
+"checksum nom 4.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "2ad2a91a8e869eeb30b9cb3119ae87773a8f4ae617f41b1eb9c154b2905f7bd6"
 "checksum num_cpus 1.10.1 (registry+https://github.com/rust-lang/crates.io-index)" = "bcef43580c035376c0705c42792c294b66974abbfd2789b511784023f71f3273"
 "checksum openssl 0.10.25 (registry+https://github.com/rust-lang/crates.io-index)" = "2f372b2b53ce10fb823a337aaa674e3a7d072b957c6264d0f4ff0bd86e657449"
 "checksum openssl-probe 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "77af24da69f9d9341038eba93a073b1fdaaa1b788221b00a69bce9e762cb32de"
@@ -1432,8 +1900,11 @@ dependencies = [
 "checksum parking_lot_core 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "b876b1b9e7ac6e1a74a6da34d25c42e17e8862aa409cbbbdcfc8d86c6f3bc62b"
 "checksum percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "31010dd2e1ac33d5b46a5b413495239882813e0369f8ed8a5e266f173602f831"
 "checksum percent-encoding 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d4fd5641d01c8f18a23da7b6fe29298ff4b55afcccdf78973b24cf3175fee32e"
+"checksum pin-utils 0.1.0-alpha.4 (registry+https://github.com/rust-lang/crates.io-index)" = "5894c618ce612a3fa23881b152b608bafb8c56cfc22f434a3ba3120b40f7b587"
 "checksum pkg-config 0.3.16 (registry+https://github.com/rust-lang/crates.io-index)" = "72d5370d90f49f70bd033c3d75e87fc529fbfff9d6f7cccef07d6170079d91ea"
 "checksum ppv-lite86 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)" = "e3cbf9f658cdb5000fcf6f362b8ea2ba154b9f146a61c7a20d647034c6b6561b"
+"checksum proc-macro-hack 0.5.11 (registry+https://github.com/rust-lang/crates.io-index)" = "ecd45702f76d6d3c75a80564378ae228a85f0b59d2f3ed43c91b4a69eb2ebfc5"
+"checksum proc-macro-nested 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "369a6ed065f249a159e06c45752c780bda2fb53c995718f9e484d08daa9eb42e"
 "checksum proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)" = "cf3d2011ab5c909338f7887f4fc896d35932e29146c12c8d01da6b22a80ba759"
 "checksum proc-macro2 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "90cf5f418035b98e655e9cdb225047638296b862b42411c4e45bb88d700f7fc0"
 "checksum publicsuffix 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "9bf259a81de2b2eb9850ec990ec78e6a25319715584fd7652b9b26f96fcb1510"
@@ -1472,9 +1943,14 @@ dependencies = [
 "checksum serde_derive 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)" = "4b133a43a1ecd55d4086bd5b4dc6c1751c68b1bfbeba7a5040442022c7e7c02e"
 "checksum serde_json 1.0.41 (registry+https://github.com/rust-lang/crates.io-index)" = "2f72eb2a68a7dc3f9a691bfda9305a1c017a6215e5a4545c258500d2099a37c2"
 "checksum serde_urlencoded 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)" = "642dd69105886af2efd227f75a520ec9b44a820d65bc133a9131f7d229fd165a"
+"checksum serde_urlencoded 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9ec5d77e2d4c73717816afac02670d5c4f534ea95ed430442cad02e7a6e32c97"
 "checksum slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c111b5bd5695e56cffe5129854aa230b39c93a305372fdbb2668ca2394eea9f8"
+"checksum sluice 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "0a7d06dfb3e8743bc19e6de8a302277471d08077d68946b307280496dc5a3531"
 "checksum smallvec 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)" = "ab606a9c5e214920bb66c458cd7be8ef094f813f20fe77a54cc7dbfff220d4b7"
+"checksum socket2 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)" = "e8b74de517221a2cb01a53349cf54182acdc31a074727d3079068448c0676d85"
+"checksum sourcefile 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "4bf77cb82ba8453b42b6ae1d692e4cdc92f9a47beaf89a847c8be83f4e328ad3"
 "checksum string 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d24114bfcceb867ca7f71a0d3fe45d45619ec47a6fbfa98cb14e14250bfa5d6d"
+"checksum surf 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "741a8008f8a833ef16f47df94a30754478fb2c2bf822b9c2e6f7f09203b97ace"
 "checksum syn 0.15.44 (registry+https://github.com/rust-lang/crates.io-index)" = "9ca4b3b69a77cbe1ffc9e198781b7acb0c7365a883670e8f1c1bc66fba79a5c5"
 "checksum syn 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "66850e97125af79138385e9b88339cbcd037e3f28ceab8c5ad98e64f0f1f80bf"
 "checksum synstructure 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)" = "02353edf96d6e4dc81aea2d8490a7e9db177bf8acb0e951c24940bf866cb313f"
@@ -1496,6 +1972,7 @@ dependencies = [
 "checksum unicase 2.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2e2e6bd1e59e56598518beb94fd6db628ded570326f0a98c679a304bd9f00150"
 "checksum unicode-bidi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "49f2bd0c6468a8230e1db229cff8029217cf623c767ea5d60bfbd42729ea54d5"
 "checksum unicode-normalization 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "141339a08b982d942be2ca06ff8b076563cbe223d1befd5450716790d44e2426"
+"checksum unicode-segmentation 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e83e153d1053cbb5a118eeff7fd5be06ed99153f00dbcd8ae310c5fb2b22edc0"
 "checksum unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fc72304796d0818e357ead4e000d19c9c174ab23dc11093ac919054d20a6a7fc"
 "checksum unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "826e7639553986605ec5979c7dd957c7895e93eabed50ab2ffa7f6128a75097c"
 "checksum url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)" = "dd4e7c0d531266369519a4aa4f399d748bd37043b00bde1e4ff1f60a120b355a"
@@ -1505,6 +1982,15 @@ dependencies = [
 "checksum version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "914b1a6776c4c929a602fafd8bc742e06365d4bcbe48c30f9cca5824f70dc9dd"
 "checksum want 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b6395efa4784b027708f7451087e647ec73cc74f5d9bc2e418404248d679a230"
 "checksum wasi 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b89c3ce4ce14bdc6fb6beaf9ec7928ca331de5df7e5ea278375642a2f478570d"
+"checksum wasm-bindgen 0.2.58 (registry+https://github.com/rust-lang/crates.io-index)" = "5205e9afdf42282b192e2310a5b463a6d1c1d774e30dc3c791ac37ab42d2616c"
+"checksum wasm-bindgen-backend 0.2.58 (registry+https://github.com/rust-lang/crates.io-index)" = "11cdb95816290b525b32587d76419facd99662a07e59d3cdb560488a819d9a45"
+"checksum wasm-bindgen-futures 0.3.27 (registry+https://github.com/rust-lang/crates.io-index)" = "83420b37346c311b9ed822af41ec2e82839bfe99867ec6c54e2da43b7538771c"
+"checksum wasm-bindgen-macro 0.2.58 (registry+https://github.com/rust-lang/crates.io-index)" = "574094772ce6921576fb6f2e3f7497b8a76273b6db092be18fc48a082de09dc3"
+"checksum wasm-bindgen-macro-support 0.2.58 (registry+https://github.com/rust-lang/crates.io-index)" = "e85031354f25eaebe78bb7db1c3d86140312a911a106b2e29f9cc440ce3e7668"
+"checksum wasm-bindgen-shared 0.2.58 (registry+https://github.com/rust-lang/crates.io-index)" = "f5e7e61fc929f4c0dddb748b102ebf9f632e2b8d739f2016542b4de2965a9601"
+"checksum wasm-bindgen-webidl 0.2.58 (registry+https://github.com/rust-lang/crates.io-index)" = "ef012a0d93fc0432df126a8eaf547b2dce25a8ce9212e1d3cbeef5c11157975d"
+"checksum web-sys 0.3.35 (registry+https://github.com/rust-lang/crates.io-index)" = "aaf97caf6aa8c2b1dac90faf0db529d9d63c93846cca4911856f78a83cebf53b"
+"checksum weedle 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3bb43f70885151e629e2a19ce9e50bd730fd436cfd4b666894c9ce4de9141164"
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 "checksum winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)" = "8093091eeb260906a183e6ae1abdba2ef5ef2257a21801128899c3fc699229c6"
 "checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
diff --git a/Cargo.toml b/Cargo.toml
index f6b7c1c5..9fdbe995 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,6 +11,8 @@ serde_json = "1.0"
 serde_derive = "1.0"
 rand = "0.6.5"
 regex = "1.3.4"
+futures = { version = "0.3.3", features = ["thread-pool"] }
+surf = "1.0.3"
 
 [lib]
 doctest = false
diff --git a/src/fetcher.rs b/src/fetcher.rs
index a60fb39e..85db1424 100644
--- a/src/fetcher.rs
+++ b/src/fetcher.rs
@@ -54,7 +54,49 @@ pub fn get_problem(frontend_question_id: u32) -> Option<Problem> {
     None
 }
 
-fn get_problems() -> Option<Problems> {
+pub async fn get_problem_async(problem_stat: StatWithStatus) -> Option<Problem> {
+    if problem_stat.paid_only {
+        println!(
+            "Problem {} is paid-only",
+            &problem_stat.stat.frontend_question_id
+        );
+        return None;
+    }
+    let resp = surf::post(GRAPHQL_URL).body_json(&Query::question_query(
+        problem_stat.stat.question_title_slug.as_ref().unwrap(),
+    ));
+    if resp.is_err() {
+        println!(
+            "Problem {} not initialized due to some error",
+            &problem_stat.stat.frontend_question_id
+        );
+        return None;
+    }
+    let resp = resp.unwrap().recv_json().await;
+    if resp.is_err() {
+        println!(
+            "Problem {} not initialized due to some error",
+            &problem_stat.stat.frontend_question_id
+        );
+        return None;
+    }
+    let resp: RawProblem = resp.unwrap();
+    return Some(Problem {
+        title: problem_stat.stat.question_title.clone().unwrap(),
+        title_slug: problem_stat.stat.question_title_slug.clone().unwrap(),
+        code_definition: serde_json::from_str(&resp.data.question.code_definition).unwrap(),
+        content: resp.data.question.content,
+        sample_test_case: resp.data.question.sample_test_case,
+        difficulty: problem_stat.difficulty.to_string(),
+        question_id: problem_stat.stat.frontend_question_id,
+        return_type: {
+            let v: Value = serde_json::from_str(&resp.data.question.meta_data).unwrap();
+            v["return"]["type"].to_string().replace("\"", "")
+        },
+    });
+}
+
+pub fn get_problems() -> Option<Problems> {
     reqwest::get(PROBLEMS_URL).unwrap().json().unwrap()
 }
 
@@ -121,18 +163,18 @@ struct Question {
 }
 
 #[derive(Debug, Serialize, Deserialize)]
-struct Problems {
+pub struct Problems {
     user_name: String,
     num_solved: u32,
     num_total: u32,
     ac_easy: u32,
     ac_medium: u32,
     ac_hard: u32,
-    stat_status_pairs: Vec<StatWithStatus>,
+    pub stat_status_pairs: Vec<StatWithStatus>,
 }
 
 #[derive(Debug, Serialize, Deserialize)]
-struct StatWithStatus {
+pub struct StatWithStatus {
     stat: Stat,
     difficulty: Difficulty,
     paid_only: bool,
diff --git a/src/main.rs b/src/main.rs
index 677fb3d6..1e78c3a0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -14,6 +14,12 @@ use std::io;
 use std::io::{BufRead, Write};
 use std::path::Path;
 
+use futures::executor::block_on;
+use futures::executor::ThreadPool;
+use futures::future::join_all;
+use futures::stream::StreamExt;
+use futures::task::SpawnExt;
+
 /// main() helps to generate the submission template .rs
 fn main() {
     println!("Welcome to leetcode-rust system.");
@@ -31,6 +37,7 @@ fn main() {
 
         let random_pattern = Regex::new(r"^random$").unwrap();
         let solving_pattern = Regex::new(r"^solve (\d+)$").unwrap();
+        let all_pattern = Regex::new(r"^all$").unwrap();
 
         if random_pattern.is_match(id_arg) {
             println!("You select random mode.");
@@ -51,6 +58,35 @@ fn main() {
                 .unwrap();
             deal_solving(&id);
             break;
+        } else if all_pattern.is_match(id_arg) {
+            // deal all problems
+            let pool = ThreadPool::new().unwrap();
+            let mut tasks = vec![];
+            let problems = fetcher::get_problems().unwrap();
+            for stat in problems.stat_status_pairs {
+                tasks.push(
+                    pool.spawn_with_handle(async move {
+                        let problem = fetcher::get_problem_async(stat).await;
+                        if problem.is_none() {
+                            return;
+                        }
+                        let problem = problem.unwrap();
+                        let code = problem
+                            .code_definition
+                            .iter()
+                            .find(|&d| d.value == "rust".to_string());
+                        if code.is_none() {
+                            println!("Problem {} has no rust version.", id);
+                            return;
+                        }
+                        let code = code.unwrap();
+                        async { deal_problem(&problem, &code) }.await
+                    })
+                    .unwrap(),
+                );
+            }
+            block_on(join_all(tasks));
+            break;
         } else {
             id = id_arg
                 .parse::<u32>()
@@ -68,7 +104,10 @@ fn main() {
                 id
             )
         });
-        let code = problem.code_definition.iter().find(|&d| d.value == "rust");
+        let code = problem
+            .code_definition
+            .iter()
+            .find(|&d| d.value == "rust".to_string());
         if code.is_none() {
             println!("Problem {} has no rust version.", &id);
             initialized_ids.push(problem.question_id);

From ccd52d0c14329dc20bffef71a3736fd479e78d7f Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Fri, 7 Feb 2020 15:31:36 +0800
Subject: [PATCH 24/47] write mod file separately

---
 src/fetcher.rs |  8 ++++----
 src/main.rs    | 41 ++++++++++++++++++++++++++++++-----------
 2 files changed, 34 insertions(+), 15 deletions(-)

diff --git a/src/fetcher.rs b/src/fetcher.rs
index 85db1424..a15dd6b2 100644
--- a/src/fetcher.rs
+++ b/src/fetcher.rs
@@ -175,7 +175,7 @@ pub struct Problems {
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct StatWithStatus {
-    stat: Stat,
+    pub stat: Stat,
     difficulty: Difficulty,
     paid_only: bool,
     is_favor: bool,
@@ -184,19 +184,19 @@ pub struct StatWithStatus {
 }
 
 #[derive(Debug, Serialize, Deserialize)]
-struct Stat {
+pub struct Stat {
     question_id: u32,
     #[serde(rename = "question__article__slug")]
     question_article_slug: Option<String>,
     #[serde(rename = "question__title")]
     question_title: Option<String>,
     #[serde(rename = "question__title_slug")]
-    question_title_slug: Option<String>,
+    pub question_title_slug: Option<String>,
     #[serde(rename = "question__hide")]
     question_hide: bool,
     total_acs: u32,
     total_submitted: u32,
-    frontend_question_id: u32,
+    pub frontend_question_id: u32,
     is_new_question: bool,
 }
 
diff --git a/src/main.rs b/src/main.rs
index 1e78c3a0..9b10a7a9 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -63,10 +63,21 @@ fn main() {
             let pool = ThreadPool::new().unwrap();
             let mut tasks = vec![];
             let problems = fetcher::get_problems().unwrap();
-            for stat in problems.stat_status_pairs {
+            let mut mod_file_addon = vec![];
+            for problem_stat in problems.stat_status_pairs {
+                mod_file_addon.push(format!(
+                    "mod p{:04}_{};",
+                    problem_stat.stat.frontend_question_id,
+                    problem_stat
+                        .stat
+                        .question_title_slug
+                        .clone()
+                        .unwrap()
+                        .replace("-", "_")
+                ));
                 tasks.push(
                     pool.spawn_with_handle(async move {
-                        let problem = fetcher::get_problem_async(stat).await;
+                        let problem = fetcher::get_problem_async(problem_stat).await;
                         if problem.is_none() {
                             return;
                         }
@@ -80,12 +91,18 @@ fn main() {
                             return;
                         }
                         let code = code.unwrap();
-                        async { deal_problem(&problem, &code) }.await
+                        async { deal_problem(&problem, &code, false) }.await
                     })
                     .unwrap(),
                 );
             }
             block_on(join_all(tasks));
+            let mut lib_file = fs::OpenOptions::new()
+                .write(true)
+                .append(true)
+                .open("./src/problem/mod.rs")
+                .unwrap();
+            writeln!(lib_file, "{}", mod_file_addon.join("\n"));
             break;
         } else {
             id = id_arg
@@ -114,7 +131,7 @@ fn main() {
             continue;
         }
         let code = code.unwrap();
-        deal_problem(&problem, &code);
+        deal_problem(&problem, &code, true);
         break;
     }
 }
@@ -278,7 +295,7 @@ fn deal_solving(id: &u32) {
     writeln!(lib_file, "mod {};", solution_name);
 }
 
-fn deal_problem(problem: &Problem, code: &CodeDefinition) {
+fn deal_problem(problem: &Problem, code: &CodeDefinition, write_mod_file: bool) {
     let file_name = format!(
         "p{:04}_{}",
         problem.question_id,
@@ -310,10 +327,12 @@ fn deal_problem(problem: &Problem, code: &CodeDefinition) {
     file.write_all(source.as_bytes()).unwrap();
     drop(file);
 
-    let mut lib_file = fs::OpenOptions::new()
-        .write(true)
-        .append(true)
-        .open("./src/problem/mod.rs")
-        .unwrap();
-    writeln!(lib_file, "mod {};", file_name);
+    if write_mod_file {
+        let mut lib_file = fs::OpenOptions::new()
+            .write(true)
+            .append(true)
+            .open("./src/problem/mod.rs")
+            .unwrap();
+        writeln!(lib_file, "mod {};", file_name);
+    }
 }

From 6bfeb47d69f4327107f93c27acc8b13e67c49fb6 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Fri, 7 Feb 2020 15:35:44 +0800
Subject: [PATCH 25/47] fix

---
 src/main.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index 9b10a7a9..755bcbd7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -87,7 +87,7 @@ fn main() {
                             .iter()
                             .find(|&d| d.value == "rust".to_string());
                         if code.is_none() {
-                            println!("Problem {} has no rust version.", id);
+                            println!("Problem {} has no rust version.", problem.question_id);
                             return;
                         }
                         let code = code.unwrap();

From 88741beff4fb5e168fe856ca8212971b5f70f4a1 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Fri, 7 Feb 2020 15:44:38 +0800
Subject: [PATCH 26/47] use arc mutex

---
 src/fetcher.rs |  8 ++++----
 src/main.rs    | 24 ++++++++++++------------
 2 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/src/fetcher.rs b/src/fetcher.rs
index a15dd6b2..85db1424 100644
--- a/src/fetcher.rs
+++ b/src/fetcher.rs
@@ -175,7 +175,7 @@ pub struct Problems {
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct StatWithStatus {
-    pub stat: Stat,
+    stat: Stat,
     difficulty: Difficulty,
     paid_only: bool,
     is_favor: bool,
@@ -184,19 +184,19 @@ pub struct StatWithStatus {
 }
 
 #[derive(Debug, Serialize, Deserialize)]
-pub struct Stat {
+struct Stat {
     question_id: u32,
     #[serde(rename = "question__article__slug")]
     question_article_slug: Option<String>,
     #[serde(rename = "question__title")]
     question_title: Option<String>,
     #[serde(rename = "question__title_slug")]
-    pub question_title_slug: Option<String>,
+    question_title_slug: Option<String>,
     #[serde(rename = "question__hide")]
     question_hide: bool,
     total_acs: u32,
     total_submitted: u32,
-    pub frontend_question_id: u32,
+    frontend_question_id: u32,
     is_new_question: bool,
 }
 
diff --git a/src/main.rs b/src/main.rs
index 755bcbd7..fd9f434f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -19,6 +19,7 @@ use futures::executor::ThreadPool;
 use futures::future::join_all;
 use futures::stream::StreamExt;
 use futures::task::SpawnExt;
+use std::sync::{Arc, Mutex};
 
 /// main() helps to generate the submission template .rs
 fn main() {
@@ -63,18 +64,9 @@ fn main() {
             let pool = ThreadPool::new().unwrap();
             let mut tasks = vec![];
             let problems = fetcher::get_problems().unwrap();
-            let mut mod_file_addon = vec![];
+            let mut mod_file_addon = Arc::new(Mutex::new(vec![]));
             for problem_stat in problems.stat_status_pairs {
-                mod_file_addon.push(format!(
-                    "mod p{:04}_{};",
-                    problem_stat.stat.frontend_question_id,
-                    problem_stat
-                        .stat
-                        .question_title_slug
-                        .clone()
-                        .unwrap()
-                        .replace("-", "_")
-                ));
+                let mod_file_addon = mod_file_addon.clone();
                 tasks.push(
                     pool.spawn_with_handle(async move {
                         let problem = fetcher::get_problem_async(problem_stat).await;
@@ -90,6 +82,14 @@ fn main() {
                             println!("Problem {} has no rust version.", problem.question_id);
                             return;
                         }
+                        async {
+                            mod_file_addon.lock().unwrap().push(format!(
+                                "mod p{:04}_{};",
+                                problem.question_id,
+                                problem.title_slug.replace("-", "_")
+                            ));
+                        }
+                        .await;
                         let code = code.unwrap();
                         async { deal_problem(&problem, &code, false) }.await
                     })
@@ -102,7 +102,7 @@ fn main() {
                 .append(true)
                 .open("./src/problem/mod.rs")
                 .unwrap();
-            writeln!(lib_file, "{}", mod_file_addon.join("\n"));
+            writeln!(lib_file, "{}", mod_file_addon.lock().unwrap().join("\n"));
             break;
         } else {
             id = id_arg

From 29e4dd6adaac5ae9eef00839f6768d8f73bc0a84 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Fri, 7 Feb 2020 15:50:32 +0800
Subject: [PATCH 27/47] fix

---
 src/main.rs | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index fd9f434f..60683184 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -23,10 +23,15 @@ use std::sync::{Arc, Mutex};
 
 /// main() helps to generate the submission template .rs
 fn main() {
-    println!("Welcome to leetcode-rust system.");
+    println!("Welcome to leetcode-rust system.\n");
     let mut initialized_ids = get_initialized_ids();
     loop {
-        println!("Please enter a frontend problem id, or \"random\" to generate a random one, or \"solve $i\" to move problem to solution/");
+        println!(
+            "Please enter a frontend problem id, \n\
+            or \"random\" to generate a random one, \n\
+            or \"solve $i\" to move problem to solution/, \n\
+            or \"all\" to initialize all problems"
+        );
         let mut is_random = false;
         let mut is_solving = false;
         let mut id: u32 = 0;

From 4aa113b7db747d58cd85e40b3d9cfba6024d934d Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Fri, 7 Feb 2020 16:12:07 +0800
Subject: [PATCH 28/47] fix

---
 src/fetcher.rs | 6 +++---
 src/main.rs    | 5 ++++-
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/fetcher.rs b/src/fetcher.rs
index 85db1424..c356dee8 100644
--- a/src/fetcher.rs
+++ b/src/fetcher.rs
@@ -175,7 +175,7 @@ pub struct Problems {
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct StatWithStatus {
-    stat: Stat,
+    pub stat: Stat,
     difficulty: Difficulty,
     paid_only: bool,
     is_favor: bool,
@@ -184,7 +184,7 @@ pub struct StatWithStatus {
 }
 
 #[derive(Debug, Serialize, Deserialize)]
-struct Stat {
+pub struct Stat {
     question_id: u32,
     #[serde(rename = "question__article__slug")]
     question_article_slug: Option<String>,
@@ -196,7 +196,7 @@ struct Stat {
     question_hide: bool,
     total_acs: u32,
     total_submitted: u32,
-    frontend_question_id: u32,
+    pub frontend_question_id: u32,
     is_new_question: bool,
 }
 
diff --git a/src/main.rs b/src/main.rs
index 60683184..5f763bdf 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -30,7 +30,7 @@ fn main() {
             "Please enter a frontend problem id, \n\
             or \"random\" to generate a random one, \n\
             or \"solve $i\" to move problem to solution/, \n\
-            or \"all\" to initialize all problems"
+            or \"all\" to initialize all problems \n"
         );
         let mut is_random = false;
         let mut is_solving = false;
@@ -71,6 +71,9 @@ fn main() {
             let problems = fetcher::get_problems().unwrap();
             let mut mod_file_addon = Arc::new(Mutex::new(vec![]));
             for problem_stat in problems.stat_status_pairs {
+                if initialized_ids.contains(&problem_stat.stat.frontend_question_id) {
+                    continue;
+                }
                 let mod_file_addon = mod_file_addon.clone();
                 tasks.push(
                     pool.spawn_with_handle(async move {

From 34c2b0d77abcc433e044451b257e6b9e0f24bc92 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Fri, 7 Feb 2020 16:39:58 +0800
Subject: [PATCH 29/47] add comment

---
 src/main.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/main.rs b/src/main.rs
index 5f763bdf..ae16b34d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -90,6 +90,7 @@ fn main() {
                             println!("Problem {} has no rust version.", problem.question_id);
                             return;
                         }
+                        // not sure this can be async
                         async {
                             mod_file_addon.lock().unwrap().push(format!(
                                 "mod p{:04}_{};",
@@ -99,6 +100,8 @@ fn main() {
                         }
                         .await;
                         let code = code.unwrap();
+                        // not sure this can be async
+                        // maybe should use async-std io
                         async { deal_problem(&problem, &code, false) }.await
                     })
                     .unwrap(),

From d01f4f4e39d2296669b2997990b25d2f592fd6bd Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Thu, 13 Feb 2020 20:39:40 +0800
Subject: [PATCH 30/47] add problem link and discuss link

---
 src/main.rs | 15 ++++++++++++++-
 template.rs |  3 +++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index ae16b34d..6fecf106 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -188,6 +188,17 @@ fn parse_extra_use(code: &str) -> String {
     extra_use_line
 }
 
+fn parse_problem_link(problem: &Problem) -> String {
+    format!("https://leetcode.com/problems/{}/", problem.title_slug)
+}
+
+fn parse_discuss_link(problem: &Problem) -> String {
+    format!(
+        "https://leetcode.com/problems/{}/discuss/?currentPage=1&orderBy=most_votes&query=",
+        problem.title_slug
+    )
+}
+
 fn insert_return_in_code(return_type: &str, code: &str) -> String {
     let re = Regex::new(r"\{[ \n]+}").unwrap();
     match return_type {
@@ -326,7 +337,9 @@ fn deal_problem(problem: &Problem, code: &CodeDefinition, write_mod_file: bool)
             &insert_return_in_code(&problem.return_type, &code.default_code),
         )
         .replace("__PROBLEM_ID__", &format!("{}", problem.question_id))
-        .replace("__EXTRA_USE__", &parse_extra_use(&code.default_code));
+        .replace("__EXTRA_USE__", &parse_extra_use(&code.default_code))
+        .replace("__PROBLEM_LINK__", &parse_problem_link(problem))
+        .replace("__DISCUSS_LINK__", &parse_discuss_link(problem));
 
     let mut file = fs::OpenOptions::new()
         .write(true)
diff --git a/template.rs b/template.rs
index 06c5c06d..11411f01 100644
--- a/template.rs
+++ b/template.rs
@@ -5,6 +5,9 @@
  */
 pub struct Solution {}__EXTRA_USE__
 
+// problem: __PROBLEM_LINK__
+// discuss: __DISCUSS_LINK__
+
 // submission codes start here
 
 __PROBLEM_DEFAULT_CODE__

From 089fb47748c12e8264e503b8d590fbd1ac6dc571 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Thu, 13 Feb 2020 20:42:50 +0800
Subject: [PATCH 31/47] fix

---
 template.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/template.rs b/template.rs
index 11411f01..9a860fe3 100644
--- a/template.rs
+++ b/template.rs
@@ -5,15 +5,15 @@
  */
 pub struct Solution {}__EXTRA_USE__
 
-// problem: __PROBLEM_LINK__
-// discuss: __DISCUSS_LINK__
-
 // submission codes start here
 
 __PROBLEM_DEFAULT_CODE__
 
 // submission codes end
 
+// problem: __PROBLEM_LINK__
+// discuss: __DISCUSS_LINK__
+
 #[cfg(test)]
 mod tests {
     use super::*;

From e62f13afe8c69b69ca8b2949179c02ff706a7d58 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Fri, 14 Feb 2020 11:10:29 +0800
Subject: [PATCH 32/47] fix

---
 template.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/template.rs b/template.rs
index 9a860fe3..11411f01 100644
--- a/template.rs
+++ b/template.rs
@@ -5,15 +5,15 @@
  */
 pub struct Solution {}__EXTRA_USE__
 
+// problem: __PROBLEM_LINK__
+// discuss: __DISCUSS_LINK__
+
 // submission codes start here
 
 __PROBLEM_DEFAULT_CODE__
 
 // submission codes end
 
-// problem: __PROBLEM_LINK__
-// discuss: __DISCUSS_LINK__
-
 #[cfg(test)]
 mod tests {
     use super::*;

From 0e99959a973590429c77aaa25bfbaa3b1be3d422 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Wed, 19 Feb 2020 22:36:33 +0800
Subject: [PATCH 33/47] rename

---
 src/solution/mod.rs                           | 416 +++++++++---------
 ...substring_without_repeating_characters.rs} |   0
 2 files changed, 208 insertions(+), 208 deletions(-)
 rename src/solution/{s0003_longest_substring.rs => s0003_longest_substring_without_repeating_characters.rs} (100%)

diff --git a/src/solution/mod.rs b/src/solution/mod.rs
index 3b079b74..bc982de9 100644
--- a/src/solution/mod.rs
+++ b/src/solution/mod.rs
@@ -1,237 +1,237 @@
+mod s0001_two_sum;
+mod s0002_add_two_numbers;
+mod s0003_longest_substring_without_repeating_characters;
+mod s0004_median_of_two_sorted_arrays;
+mod s0005_longest_palindromic_substring;
 mod s0006_zigzag_conversion;
-mod s0238_product_of_array_except_self;
-mod s0115_distinct_subsequences;
-mod s0099_recover_binary_search_tree;
-mod s0310_minimum_height_trees;
-mod s0128_longest_consecutive_sequence;
-mod s0274_h_index;
-mod s0241_different_ways_to_add_parentheses;
+mod s0007_reverse_integer;
+mod s0008_string_to_integer_atoi;
+mod s0009_palindrome_number;
+mod s0010_regular_expression_matching;
+mod s0011_container_with_most_water;
+mod s0012_integer_to_roman;
+mod s0013_roman_to_integer;
+mod s0014_longest_common_prefix;
+mod s0015_3sum;
+mod s0016_3sum_closest;
+mod s0017_letter_combinations_of_a_phone_number;
+mod s0018_4sum;
+mod s0019_remove_nth_node_from_end_of_list;
+mod s0020_valid_parentheses;
+mod s0021_merge_two_sorted_lists;
+mod s0022_generate_parentheses;
+mod s0023_merge_k_sorted_lists;
 mod s0024_swap_nodes_in_pairs;
-mod s0110_balanced_binary_tree;
-mod s0093_restore_ip_addresses;
-mod s0076_minimum_window_substring;
-mod s0124_binary_tree_maximum_path_sum;
-mod s0122_best_time_to_buy_and_sell_stock_ii;
-mod s0169_majority_element;
-mod s0162_find_peak_element;
-mod s0095_unique_binary_search_trees_ii;
-mod s0155_min_stack;
-mod s0040_combination_sum_ii;
-mod s0217_contains_duplicate;
-mod s0055_jump_game;
-mod s0106_construct_binary_tree_from_inorder_and_postorder_traversal;
-mod s0145_binary_tree_postorder_traversal;
-mod s0079_word_search;
-mod s0969_pancake_sorting;
-mod s0042_trapping_rain_water;
-mod s0108_convert_sorted_array_to_binary_search_tree;
-mod s0083_remove_duplicates_from_sorted_list;
-mod s0130_surrounded_regions;
-mod s0226_invert_binary_tree;
+mod s0025_reverse_nodes_in_k_group;
+mod s0026_remove_duplicates_from_sorted_array;
 mod s0027_remove_element;
-mod s0188_best_time_to_buy_and_sell_stock_iv;
-mod s0204_count_primes;
-mod s0268_missing_number;
-mod s0214_shortest_palindrome;
-mod s0231_power_of_two;
-mod s0202_happy_number;
-mod s0075_sort_colors;
-mod s0066_plus_one;
 mod s0028_implement_strstr;
-mod s0290_word_pattern;
-mod s0048_rotate_image;
-mod s0089_gray_code;
-mod s0147_insertion_sort_list;
-mod s0084_largest_rectangle_in_histogram;
-mod s0011_container_with_most_water;
-mod s0009_palindrome_number;
-mod s0058_length_of_last_word;
-mod s0080_remove_duplicates_from_sorted_array_ii;
+mod s0029_divide_two_integers;
 mod s0030_substring_with_concatenation_of_all_words;
-mod s0060_permutation_sequence;
-mod s0071_simplify_path;
-mod s0038_count_and_say;
-mod s0144_binary_tree_preorder_traversal;
-mod s0279_perfect_squares;
-mod s0304_range_sum_query_2d_immutable;
-mod s0292_nim_game;
-mod s0264_ugly_number_ii;
-mod s0132_palindrome_partitioning_ii;
-mod s0019_remove_nth_node_from_end_of_list;
-mod s0136_single_number;
-mod s0018_4sum;
-mod s0220_contains_duplicate_iii;
-mod s0299_bulls_and_cows;
-mod s0232_implement_queue_using_stacks;
-mod s0100_same_tree;
-mod s0171_excel_sheet_column_number;
-mod s0087_scramble_string;
-mod s0704_binary_search;
-mod s0219_contains_duplicate_ii;
-mod s0086_partition_list;
-mod s0082_remove_duplicates_from_sorted_list_ii;
-mod s0228_summary_ranges;
-mod s0020_valid_parentheses;
-mod s0017_letter_combinations_of_a_phone_number;
-mod s0312_burst_balloons;
-mod s0306_additive_number;
-mod s0283_move_zeroes;
-mod s1018_binary_prefix_divisible_by_5;
-mod s0201_bitwise_and_of_numbers_range;
-mod s0109_convert_sorted_list_to_binary_search_tree;
-mod s0101_symmetric_tree;
-mod s0098_validate_binary_search_tree;
+mod s0031_next_permutation;
+mod s0032_longest_valid_parentheses;
+mod s0033_search_in_rotated_sorted_array;
+mod s0034_find_first_and_last_position_of_element_in_sorted_array;
 mod s0035_search_insert_position;
-mod s0050_powx_n;
-mod s0198_house_robber;
-mod s0004_median_of_two_sorted_arrays;
-mod s0221_maximal_square;
+mod s0036_valid_sudoku;
+mod s0037_sudoku_solver;
+mod s0038_count_and_say;
+mod s0039_combination_sum;
+mod s0040_combination_sum_ii;
+mod s0041_first_missing_positive;
+mod s0042_trapping_rain_water;
+mod s0043_multiply_strings;
+mod s0044_wildcard_matching;
+mod s0045_jump_game_ii;
+mod s0046_permutations;
 mod s0047_permutations_ii;
-mod s0172_factorial_trailing_zeroes;
-mod s0054_spiral_matrix;
+mod s0048_rotate_image;
+mod s0049_group_anagrams;
+mod s0050_powx_n;
+mod s0051_n_queens;
+mod s0052_n_queens_ii;
 mod s0053_maximum_subarray;
-mod s1046_last_stone_weight;
-mod s0146_lru_cache;
-mod s0126_word_ladder_ii;
-mod s0242_valid_anagram;
-mod s0112_path_sum;
-mod s0023_merge_k_sorted_lists;
-mod s0230_kth_smallest_element_in_a_bst;
-mod s0104_maximum_depth_of_binary_tree;
-mod s0258_add_digits;
-mod s0187_repeated_dna_sequences;
-mod s0025_reverse_nodes_in_k_group;
-mod s0039_combination_sum;
-mod s0107_binary_tree_level_order_traversal_ii;
-mod s0091_decode_ways;
+mod s0054_spiral_matrix;
+mod s0055_jump_game;
 mod s0056_merge_intervals;
+mod s0057_insert_interval;
+mod s0058_length_of_last_word;
+mod s0059_spiral_matrix_ii;
+mod s0060_permutation_sequence;
+mod s0061_rotate_list;
+mod s0062_unique_paths;
+mod s0063_unique_paths_ii;
+mod s0064_minimum_path_sum;
 mod s0065_valid_number;
-mod s0016_3sum_closest;
-mod s0096_unique_binary_search_trees;
+mod s0066_plus_one;
+mod s0067_add_binary;
+mod s0068_text_justification;
+mod s0069_sqrtx;
+mod s0070_climbing_stairs;
+mod s0071_simplify_path;
 mod s0072_edit_distance;
-mod s0044_wildcard_matching;
-mod s0239_sliding_window_maximum;
-mod s0174_dungeon_game;
 mod s0073_set_matrix_zeroes;
+mod s0074_search_a_2d_matrix;
+mod s0075_sort_colors;
+mod s0076_minimum_window_substring;
+mod s0077_combinations;
 mod s0078_subsets;
-mod s0037_sudoku_solver;
-mod s0033_search_in_rotated_sorted_array;
-mod s0002_add_two_numbers;
-mod s0313_super_ugly_number;
-mod s0068_text_justification;
-mod s0064_minimum_path_sum;
-mod s0218_the_skyline_problem;
-mod s0125_valid_palindrome;
-mod s0210_course_schedule_ii;
-mod s0143_reorder_list;
-mod s0164_maximum_gap;
+mod s0079_word_search;
+mod s0080_remove_duplicates_from_sorted_array_ii;
+mod s0081_search_in_rotated_sorted_array_ii;
+mod s0082_remove_duplicates_from_sorted_list_ii;
+mod s0083_remove_duplicates_from_sorted_list;
+mod s0084_largest_rectangle_in_histogram;
+mod s0085_maximal_rectangle;
+mod s0086_partition_list;
+mod s0087_scramble_string;
+mod s0088_merge_sorted_array;
+mod s0089_gray_code;
+mod s0090_subsets_ii;
+mod s0091_decode_ways;
+mod s0092_reverse_linked_list_ii;
+mod s0093_restore_ip_addresses;
+mod s0094_binary_tree_inorder_traversal;
+mod s0095_unique_binary_search_trees_ii;
+mod s0096_unique_binary_search_trees;
 mod s0097_interleaving_string;
+mod s0098_validate_binary_search_tree;
+mod s0099_recover_binary_search_tree;
+mod s0100_same_tree;
+mod s0101_symmetric_tree;
+mod s0102_binary_tree_level_order_traversal;
+mod s0103_binary_tree_zigzag_level_order_traversal;
+mod s0104_maximum_depth_of_binary_tree;
 mod s0105_construct_binary_tree_from_preorder_and_inorder_traversal;
-mod s0167_two_sum_ii_input_array_is_sorted;
-mod s0034_find_first_and_last_position_of_element_in_sorted_array;
-mod s0094_binary_tree_inorder_traversal;
-mod s0052_n_queens_ii;
+mod s0106_construct_binary_tree_from_inorder_and_postorder_traversal;
+mod s0107_binary_tree_level_order_traversal_ii;
+mod s0108_convert_sorted_array_to_binary_search_tree;
+mod s0109_convert_sorted_list_to_binary_search_tree;
+mod s0110_balanced_binary_tree;
+mod s0111_minimum_depth_of_binary_tree;
+mod s0112_path_sum;
+mod s0113_path_sum_ii;
+mod s0114_flatten_binary_tree_to_linked_list;
+mod s0115_distinct_subsequences;
+mod s0118_pascals_triangle;
+mod s0119_pascals_triangle_ii;
+mod s0120_triangle;
 mod s0121_best_time_to_buy_and_sell_stock;
-mod s0273_integer_to_english_words;
-mod s0225_implement_stack_using_queues;
-mod s0046_permutations;
-mod s0085_maximal_rectangle;
+mod s0122_best_time_to_buy_and_sell_stock_ii;
+mod s0123_best_time_to_buy_and_sell_stock_iii;
+mod s0124_binary_tree_maximum_path_sum;
+mod s0125_valid_palindrome;
+mod s0126_word_ladder_ii;
+mod s0127_word_ladder;
+mod s0128_longest_consecutive_sequence;
+mod s0129_sum_root_to_leaf_numbers;
+mod s0130_surrounded_regions;
+mod s0131_palindrome_partitioning;
+mod s0132_palindrome_partitioning_ii;
+mod s0134_gas_station;
 mod s0135_candy;
-mod s0113_path_sum_ii;
-mod s0029_divide_two_integers;
-mod s0260_single_number_iii;
+mod s0136_single_number;
+mod s0137_single_number_ii;
+mod s0139_word_break;
 mod s0140_word_break_ii;
+mod s0143_reorder_list;
+mod s0144_binary_tree_preorder_traversal;
+mod s0145_binary_tree_postorder_traversal;
+mod s0146_lru_cache;
+mod s0147_insertion_sort_list;
+mod s0148_sort_list;
 mod s0149_max_points_on_a_line;
-mod s0213_house_robber_ii;
-mod s0222_count_complete_tree_nodes;
-mod s0134_gas_station;
-mod s0057_insert_interval;
-mod s0173_binary_search_tree_iterator;
-mod s0077_combinations;
-mod s0005_longest_palindromic_substring;
-mod s0041_first_missing_positive;
-mod s0026_remove_duplicates_from_sorted_array;
+mod s0150_evaluate_reverse_polish_notation;
+mod s0151_reverse_words_in_a_string;
+mod s0152_maximum_product_subarray;
+mod s0153_find_minimum_in_rotated_sorted_array;
+mod s0154_find_minimum_in_rotated_sorted_array_ii;
+mod s0155_min_stack;
+mod s0162_find_peak_element;
+mod s0164_maximum_gap;
+mod s0165_compare_version_numbers;
 mod s0166_fraction_to_recurring_decimal;
-mod s0119_pascals_triangle_ii;
-mod s0012_integer_to_roman;
-mod s0223_rectangle_area;
-mod s0229_majority_element_ii;
-mod s0061_rotate_list;
-mod s0123_best_time_to_buy_and_sell_stock_iii;
-mod s0301_remove_invalid_parentheses;
-mod s0067_add_binary;
-mod s0049_group_anagrams;
+mod s0167_two_sum_ii_input_array_is_sorted;
+mod s0168_excel_sheet_column_title;
+mod s0169_majority_element;
+mod s0171_excel_sheet_column_number;
+mod s0172_factorial_trailing_zeroes;
+mod s0173_binary_search_tree_iterator;
+mod s0174_dungeon_game;
+mod s0179_largest_number;
+mod s0187_repeated_dna_sequences;
+mod s0188_best_time_to_buy_and_sell_stock_iv;
 mod s0189_rotate_array;
-mod s0001_two_sum;
-mod s0275_h_index_ii;
-mod s0103_binary_tree_zigzag_level_order_traversal;
-mod s0137_single_number_ii;
+mod s0198_house_robber;
+mod s0199_binary_tree_right_side_view;
+mod s0200_number_of_islands;
+mod s0201_bitwise_and_of_numbers_range;
+mod s0202_happy_number;
+mod s0203_remove_linked_list_elements;
+mod s0204_count_primes;
+mod s0205_isomorphic_strings;
+mod s0206_reverse_linked_list;
+mod s0207_course_schedule;
 mod s0208_implement_trie_prefix_tree;
-mod s0300_longest_increasing_subsequence;
-mod s0118_pascals_triangle;
-mod s0010_regular_expression_matching;
-mod s0013_roman_to_integer;
 mod s0209_minimum_size_subarray_sum;
+mod s0210_course_schedule_ii;
+mod s0211_add_and_search_word_data_structure_design;
+mod s0212_word_search_ii;
+mod s0213_house_robber_ii;
+mod s0214_shortest_palindrome;
+mod s0215_kth_largest_element_in_an_array;
+mod s0216_combination_sum_iii;
+mod s0217_contains_duplicate;
+mod s0218_the_skyline_problem;
+mod s0219_contains_duplicate_ii;
+mod s0220_contains_duplicate_iii;
+mod s0221_maximal_square;
+mod s0222_count_complete_tree_nodes;
+mod s0223_rectangle_area;
+mod s0224_basic_calculator;
+mod s0225_implement_stack_using_queues;
+mod s0226_invert_binary_tree;
 mod s0227_basic_calculator_ii;
-mod s0022_generate_parentheses;
-mod s0008_string_to_integer_atoi;
-mod s0152_maximum_product_subarray;
-mod s0014_longest_common_prefix;
-mod s0070_climbing_stairs;
+mod s0228_summary_ranges;
+mod s0229_majority_element_ii;
+mod s0230_kth_smallest_element_in_a_bst;
+mod s0231_power_of_two;
+mod s0232_implement_queue_using_stacks;
 mod s0233_number_of_digit_one;
-mod s0154_find_minimum_in_rotated_sorted_array_ii;
-mod s0127_word_ladder;
-mod s0207_course_schedule;
-mod s0263_ugly_number;
-mod s0295_find_median_from_data_stream;
-mod s0148_sort_list;
+mod s0238_product_of_array_except_self;
+mod s0239_sliding_window_maximum;
+mod s0241_different_ways_to_add_parentheses;
+mod s0242_valid_anagram;
 mod s0257_binary_tree_paths;
-mod s0120_triangle;
-mod s0309_best_time_to_buy_and_sell_stock_with_cooldown;
-mod s0074_search_a_2d_matrix;
-mod s0215_kth_largest_element_in_an_array;
-mod s0203_remove_linked_list_elements;
-mod s0081_search_in_rotated_sorted_array_ii;
-mod s0059_spiral_matrix_ii;
-mod s0151_reverse_words_in_a_string;
-mod s0205_isomorphic_strings;
-mod s0179_largest_number;
-mod s0168_excel_sheet_column_title;
-mod s0007_reverse_integer;
-mod s0032_longest_valid_parentheses;
-mod s0165_compare_version_numbers;
-mod s0031_next_permutation;
-mod s0088_merge_sorted_array;
-mod s0509_fibonacci_number;
-mod s0036_valid_sudoku;
-mod s0069_sqrtx;
-mod s0211_add_and_search_word_data_structure_design;
-mod s0114_flatten_binary_tree_to_linked_list;
-mod s0224_basic_calculator;
-mod s0045_jump_game_ii;
-mod s0051_n_queens;
-mod s0212_word_search_ii;
+mod s0258_add_digits;
+mod s0260_single_number_iii;
+mod s0263_ugly_number;
+mod s0264_ugly_number_ii;
+mod s0268_missing_number;
+mod s0273_integer_to_english_words;
+mod s0274_h_index;
+mod s0275_h_index_ii;
+mod s0279_perfect_squares;
+mod s0282_expression_add_operators;
+mod s0283_move_zeroes;
 mod s0287_find_the_duplicate_number;
-mod s0153_find_minimum_in_rotated_sorted_array;
 mod s0289_game_of_life;
-mod s0200_number_of_islands;
-mod s0015_3sum;
-mod s0216_combination_sum_iii;
-mod s0043_multiply_strings;
-mod s0090_subsets_ii;
-mod s0003_longest_substring;
-mod s0139_word_break;
-mod s0150_evaluate_reverse_polish_notation;
-mod s0063_unique_paths_ii;
-mod s0062_unique_paths;
-mod s0199_binary_tree_right_side_view;
-mod s0282_expression_add_operators;
-mod s0021_merge_two_sorted_lists;
-mod s0129_sum_root_to_leaf_numbers;
-mod s0206_reverse_linked_list;
-mod s0131_palindrome_partitioning;
-mod s0307_range_sum_query_mutable;
-mod s0111_minimum_depth_of_binary_tree;
-mod s0092_reverse_linked_list_ii;
+mod s0290_word_pattern;
+mod s0292_nim_game;
+mod s0295_find_median_from_data_stream;
+mod s0299_bulls_and_cows;
+mod s0300_longest_increasing_subsequence;
+mod s0301_remove_invalid_parentheses;
 mod s0303_range_sum_query_immutable;
-mod s0102_binary_tree_level_order_traversal;
+mod s0304_range_sum_query_2d_immutable;
+mod s0306_additive_number;
+mod s0307_range_sum_query_mutable;
+mod s0309_best_time_to_buy_and_sell_stock_with_cooldown;
+mod s0310_minimum_height_trees;
+mod s0312_burst_balloons;
+mod s0313_super_ugly_number;
+mod s0509_fibonacci_number;
+mod s0704_binary_search;
+mod s0969_pancake_sorting;
+mod s1018_binary_prefix_divisible_by_5;
+mod s1046_last_stone_weight;
diff --git a/src/solution/s0003_longest_substring.rs b/src/solution/s0003_longest_substring_without_repeating_characters.rs
similarity index 100%
rename from src/solution/s0003_longest_substring.rs
rename to src/solution/s0003_longest_substring_without_repeating_characters.rs

From 5baae866fab47cc0fcef837ac965d64f12fde080 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Wed, 19 Feb 2020 22:38:06 +0800
Subject: [PATCH 34/47] add start line

---
 src/solution/s0074_search_a_2d_matrix.rs   | 2 ++
 src/solution/s0086_partition_list.rs       | 2 ++
 src/solution/s0149_max_points_on_a_line.rs | 2 ++
 3 files changed, 6 insertions(+)

diff --git a/src/solution/s0074_search_a_2d_matrix.rs b/src/solution/s0074_search_a_2d_matrix.rs
index e95f02a3..d535f16e 100644
--- a/src/solution/s0074_search_a_2d_matrix.rs
+++ b/src/solution/s0074_search_a_2d_matrix.rs
@@ -36,6 +36,8 @@
  */
 pub struct Solution {}
 
+// submission codes start here
+
 impl Solution {
     pub fn search_matrix(matrix: Vec<Vec<i32>>, target: i32) -> bool {
         if matrix.is_empty() {
diff --git a/src/solution/s0086_partition_list.rs b/src/solution/s0086_partition_list.rs
index 4238586f..d30a9053 100644
--- a/src/solution/s0086_partition_list.rs
+++ b/src/solution/s0086_partition_list.rs
@@ -16,6 +16,8 @@
 pub struct Solution {}
 use crate::util::linked_list::{to_list, ListNode};
 
+// submission codes start here
+
 impl Solution {
     pub fn partition(head: Option<Box<ListNode>>, x: i32) -> Option<Box<ListNode>> {
         let mut lower = Some(Box::new(ListNode::new(0)));
diff --git a/src/solution/s0149_max_points_on_a_line.rs b/src/solution/s0149_max_points_on_a_line.rs
index c2faf93b..1b0bf16c 100644
--- a/src/solution/s0149_max_points_on_a_line.rs
+++ b/src/solution/s0149_max_points_on_a_line.rs
@@ -38,6 +38,8 @@
 pub struct Solution {}
 use crate::util::point::Point;
 
+// submission codes start here
+
 /*
 要回顾下高中数学：已知两点, 求解一般式:
 

From 5552d15974f5b03ed14991568e30a4fbda53ecd3 Mon Sep 17 00:00:00 2001
From: songyzh <mailsyzh@gmail.com>
Date: Wed, 19 Feb 2020 22:41:34 +0800
Subject: [PATCH 35/47] add problem and discuss link to existing solutions

---
 src/solution/s0001_two_sum.rs                                  | 3 +++
 src/solution/s0002_add_two_numbers.rs                          | 3 +++
 .../s0003_longest_substring_without_repeating_characters.rs    | 3 +++
 src/solution/s0004_median_of_two_sorted_arrays.rs              | 3 +++
 src/solution/s0005_longest_palindromic_substring.rs            | 3 +++
 src/solution/s0006_zigzag_conversion.rs                        | 3 +++
 src/solution/s0007_reverse_integer.rs                          | 3 +++
 src/solution/s0008_string_to_integer_atoi.rs                   | 3 +++
 src/solution/s0009_palindrome_number.rs                        | 3 +++
 src/solution/s0010_regular_expression_matching.rs              | 3 +++
 src/solution/s0011_container_with_most_water.rs                | 3 +++
 src/solution/s0012_integer_to_roman.rs                         | 3 +++
 src/solution/s0013_roman_to_integer.rs                         | 3 +++
 src/solution/s0014_longest_common_prefix.rs                    | 3 +++
 src/solution/s0015_3sum.rs                                     | 3 +++
 src/solution/s0016_3sum_closest.rs                             | 3 +++
 src/solution/s0017_letter_combinations_of_a_phone_number.rs    | 3 +++
 src/solution/s0018_4sum.rs                                     | 3 +++
 src/solution/s0019_remove_nth_node_from_end_of_list.rs         | 3 +++
 src/solution/s0020_valid_parentheses.rs                        | 3 +++
 src/solution/s0021_merge_two_sorted_lists.rs                   | 3 +++
 src/solution/s0022_generate_parentheses.rs                     | 3 +++
 src/solution/s0023_merge_k_sorted_lists.rs                     | 3 +++
 src/solution/s0024_swap_nodes_in_pairs.rs                      | 3 +++
 src/solution/s0025_reverse_nodes_in_k_group.rs                 | 3 +++
 src/solution/s0026_remove_duplicates_from_sorted_array.rs      | 3 +++
 src/solution/s0027_remove_element.rs                           | 3 +++
 src/solution/s0028_implement_strstr.rs                         | 3 +++
 src/solution/s0029_divide_two_integers.rs                      | 3 +++
 .../s0030_substring_with_concatenation_of_all_words.rs         | 3 +++
 src/solution/s0031_next_permutation.rs                         | 3 +++
 src/solution/s0032_longest_valid_parentheses.rs                | 3 +++
 src/solution/s0033_search_in_rotated_sorted_array.rs           | 3 +++
 ..._find_first_and_last_position_of_element_in_sorted_array.rs | 3 +++
 src/solution/s0035_search_insert_position.rs                   | 3 +++
 src/solution/s0036_valid_sudoku.rs                             | 3 +++
 src/solution/s0037_sudoku_solver.rs                            | 3 +++
 src/solution/s0038_count_and_say.rs                            | 3 +++
 src/solution/s0039_combination_sum.rs                          | 3 +++
 src/solution/s0040_combination_sum_ii.rs                       | 3 +++
 src/solution/s0041_first_missing_positive.rs                   | 3 +++
 src/solution/s0042_trapping_rain_water.rs                      | 3 +++
 src/solution/s0043_multiply_strings.rs                         | 3 +++
 src/solution/s0044_wildcard_matching.rs                        | 3 +++
 src/solution/s0045_jump_game_ii.rs                             | 3 +++
 src/solution/s0046_permutations.rs                             | 3 +++
 src/solution/s0047_permutations_ii.rs                          | 3 +++
 src/solution/s0048_rotate_image.rs                             | 3 +++
 src/solution/s0049_group_anagrams.rs                           | 3 +++
 src/solution/s0050_powx_n.rs                                   | 3 +++
 src/solution/s0051_n_queens.rs                                 | 3 +++
 src/solution/s0052_n_queens_ii.rs                              | 3 +++
 src/solution/s0053_maximum_subarray.rs                         | 3 +++
 src/solution/s0054_spiral_matrix.rs                            | 3 +++
 src/solution/s0055_jump_game.rs                                | 3 +++
 src/solution/s0056_merge_intervals.rs                          | 3 +++
 src/solution/s0057_insert_interval.rs                          | 3 +++
 src/solution/s0058_length_of_last_word.rs                      | 3 +++
 src/solution/s0059_spiral_matrix_ii.rs                         | 3 +++
 src/solution/s0060_permutation_sequence.rs                     | 3 +++
 src/solution/s0061_rotate_list.rs                              | 3 +++
 src/solution/s0062_unique_paths.rs                             | 3 +++
 src/solution/s0063_unique_paths_ii.rs                          | 3 +++
 src/solution/s0064_minimum_path_sum.rs                         | 3 +++
 src/solution/s0065_valid_number.rs                             | 3 +++
 src/solution/s0066_plus_one.rs                                 | 3 +++
 src/solution/s0067_add_binary.rs                               | 3 +++
 src/solution/s0068_text_justification.rs                       | 3 +++
 src/solution/s0069_sqrtx.rs                                    | 3 +++
 src/solution/s0070_climbing_stairs.rs                          | 3 +++
 src/solution/s0071_simplify_path.rs                            | 3 +++
 src/solution/s0072_edit_distance.rs                            | 3 +++
 src/solution/s0073_set_matrix_zeroes.rs                        | 3 +++
 src/solution/s0074_search_a_2d_matrix.rs                       | 3 +++
 src/solution/s0075_sort_colors.rs                              | 3 +++
 src/solution/s0076_minimum_window_substring.rs                 | 3 +++
 src/solution/s0077_combinations.rs                             | 3 +++
 src/solution/s0078_subsets.rs                                  | 3 +++
 src/solution/s0079_word_search.rs                              | 3 +++
 src/solution/s0080_remove_duplicates_from_sorted_array_ii.rs   | 3 +++
 src/solution/s0081_search_in_rotated_sorted_array_ii.rs        | 3 +++
 src/solution/s0082_remove_duplicates_from_sorted_list_ii.rs    | 3 +++
 src/solution/s0083_remove_duplicates_from_sorted_list.rs       | 3 +++
 src/solution/s0084_largest_rectangle_in_histogram.rs           | 3 +++
 src/solution/s0085_maximal_rectangle.rs                        | 3 +++
 src/solution/s0086_partition_list.rs                           | 3 +++
 src/solution/s0087_scramble_string.rs                          | 3 +++
 src/solution/s0088_merge_sorted_array.rs                       | 3 +++
 src/solution/s0089_gray_code.rs                                | 3 +++
 src/solution/s0090_subsets_ii.rs                               | 3 +++
 src/solution/s0091_decode_ways.rs                              | 3 +++
 src/solution/s0092_reverse_linked_list_ii.rs                   | 3 +++
 src/solution/s0093_restore_ip_addresses.rs                     | 3 +++
 src/solution/s0094_binary_tree_inorder_traversal.rs            | 3 +++
 src/solution/s0095_unique_binary_search_trees_ii.rs            | 3 +++
 src/solution/s0096_unique_binary_search_trees.rs               | 3 +++
 src/solution/s0097_interleaving_string.rs                      | 3 +++
 src/solution/s0098_validate_binary_search_tree.rs              | 3 +++
 src/solution/s0099_recover_binary_search_tree.rs               | 3 +++
 src/solution/s0100_same_tree.rs                                | 3 +++
 src/solution/s0101_symmetric_tree.rs                           | 3 +++
 src/solution/s0102_binary_tree_level_order_traversal.rs        | 3 +++
 src/solution/s0103_binary_tree_zigzag_level_order_traversal.rs | 3 +++
 src/solution/s0104_maximum_depth_of_binary_tree.rs             | 3 +++
 ...onstruct_binary_tree_from_preorder_and_inorder_traversal.rs | 3 +++
 ...nstruct_binary_tree_from_inorder_and_postorder_traversal.rs | 3 +++
 src/solution/s0107_binary_tree_level_order_traversal_ii.rs     | 3 +++
 .../s0108_convert_sorted_array_to_binary_search_tree.rs        | 3 +++
 .../s0109_convert_sorted_list_to_binary_search_tree.rs         | 3 +++
 src/solution/s0110_balanced_binary_tree.rs                     | 3 +++
 src/solution/s0111_minimum_depth_of_binary_tree.rs             | 3 +++
 src/solution/s0112_path_sum.rs                                 | 3 +++
 src/solution/s0113_path_sum_ii.rs                              | 3 +++
 src/solution/s0114_flatten_binary_tree_to_linked_list.rs       | 3 +++
 src/solution/s0115_distinct_subsequences.rs                    | 3 +++
 src/solution/s0118_pascals_triangle.rs                         | 3 +++
 src/solution/s0119_pascals_triangle_ii.rs                      | 3 +++
 src/solution/s0120_triangle.rs                                 | 3 +++
 src/solution/s0121_best_time_to_buy_and_sell_stock.rs          | 3 +++
 src/solution/s0122_best_time_to_buy_and_sell_stock_ii.rs       | 3 +++
 src/solution/s0123_best_time_to_buy_and_sell_stock_iii.rs      | 3 +++
 src/solution/s0124_binary_tree_maximum_path_sum.rs             | 3 +++
 src/solution/s0125_valid_palindrome.rs                         | 3 +++
 src/solution/s0126_word_ladder_ii.rs                           | 3 +++
 src/solution/s0127_word_ladder.rs                              | 3 +++
 src/solution/s0128_longest_consecutive_sequence.rs             | 3 +++
 src/solution/s0129_sum_root_to_leaf_numbers.rs                 | 3 +++
 src/solution/s0130_surrounded_regions.rs                       | 3 +++
 src/solution/s0131_palindrome_partitioning.rs                  | 3 +++
 src/solution/s0132_palindrome_partitioning_ii.rs               | 3 +++
 src/solution/s0134_gas_station.rs                              | 3 +++
 src/solution/s0135_candy.rs                                    | 3 +++
 src/solution/s0136_single_number.rs                            | 3 +++
 src/solution/s0137_single_number_ii.rs                         | 3 +++
 src/solution/s0139_word_break.rs                               | 3 +++
 src/solution/s0140_word_break_ii.rs                            | 3 +++
 src/solution/s0143_reorder_list.rs                             | 3 +++
 src/solution/s0144_binary_tree_preorder_traversal.rs           | 3 +++
 src/solution/s0145_binary_tree_postorder_traversal.rs          | 3 +++
 src/solution/s0146_lru_cache.rs                                | 3 +++
 src/solution/s0147_insertion_sort_list.rs                      | 3 +++
 src/solution/s0148_sort_list.rs                                | 3 +++
 src/solution/s0149_max_points_on_a_line.rs                     | 3 +++
 src/solution/s0150_evaluate_reverse_polish_notation.rs         | 3 +++
 src/solution/s0151_reverse_words_in_a_string.rs                | 3 +++
 src/solution/s0152_maximum_product_subarray.rs                 | 3 +++
 src/solution/s0153_find_minimum_in_rotated_sorted_array.rs     | 3 +++
 src/solution/s0154_find_minimum_in_rotated_sorted_array_ii.rs  | 3 +++
 src/solution/s0155_min_stack.rs                                | 3 +++
 src/solution/s0162_find_peak_element.rs                        | 3 +++
 src/solution/s0164_maximum_gap.rs                              | 3 +++
 src/solution/s0165_compare_version_numbers.rs                  | 3 +++
 src/solution/s0166_fraction_to_recurring_decimal.rs            | 3 +++
 src/solution/s0167_two_sum_ii_input_array_is_sorted.rs         | 3 +++
 src/solution/s0168_excel_sheet_column_title.rs                 | 3 +++
 src/solution/s0169_majority_element.rs                         | 3 +++
 src/solution/s0171_excel_sheet_column_number.rs                | 3 +++
 src/solution/s0172_factorial_trailing_zeroes.rs                | 3 +++
 src/solution/s0173_binary_search_tree_iterator.rs              | 3 +++
 src/solution/s0174_dungeon_game.rs                             | 3 +++
 src/solution/s0179_largest_number.rs                           | 3 +++
 src/solution/s0187_repeated_dna_sequences.rs                   | 3 +++
 src/solution/s0188_best_time_to_buy_and_sell_stock_iv.rs       | 3 +++
 src/solution/s0189_rotate_array.rs                             | 3 +++
 src/solution/s0198_house_robber.rs                             | 3 +++
 src/solution/s0199_binary_tree_right_side_view.rs              | 3 +++
 src/solution/s0200_number_of_islands.rs                        | 3 +++
 src/solution/s0201_bitwise_and_of_numbers_range.rs             | 3 +++
 src/solution/s0202_happy_number.rs                             | 3 +++
 src/solution/s0203_remove_linked_list_elements.rs              | 3 +++
 src/solution/s0204_count_primes.rs                             | 3 +++
 src/solution/s0205_isomorphic_strings.rs                       | 3 +++
 src/solution/s0206_reverse_linked_list.rs                      | 3 +++
 src/solution/s0207_course_schedule.rs                          | 3 +++
 src/solution/s0208_implement_trie_prefix_tree.rs               | 3 +++
 src/solution/s0209_minimum_size_subarray_sum.rs                | 3 +++
 src/solution/s0210_course_schedule_ii.rs                       | 3 +++
 .../s0211_add_and_search_word_data_structure_design.rs         | 3 +++
 src/solution/s0212_word_search_ii.rs                           | 3 +++
 src/solution/s0213_house_robber_ii.rs                          | 3 +++
 src/solution/s0214_shortest_palindrome.rs                      | 3 +++
 src/solution/s0215_kth_largest_element_in_an_array.rs          | 3 +++
 src/solution/s0216_combination_sum_iii.rs                      | 3 +++
 src/solution/s0217_contains_duplicate.rs                       | 3 +++
 src/solution/s0218_the_skyline_problem.rs                      | 3 +++
 src/solution/s0219_contains_duplicate_ii.rs                    | 3 +++
 src/solution/s0220_contains_duplicate_iii.rs                   | 3 +++
 src/solution/s0221_maximal_square.rs                           | 3 +++
 src/solution/s0222_count_complete_tree_nodes.rs                | 3 +++
 src/solution/s0223_rectangle_area.rs                           | 3 +++
 src/solution/s0224_basic_calculator.rs                         | 3 +++
 src/solution/s0225_implement_stack_using_queues.rs             | 3 +++
 src/solution/s0226_invert_binary_tree.rs                       | 3 +++
 src/solution/s0227_basic_calculator_ii.rs                      | 3 +++
 src/solution/s0228_summary_ranges.rs                           | 3 +++
 src/solution/s0229_majority_element_ii.rs                      | 3 +++
 src/solution/s0230_kth_smallest_element_in_a_bst.rs            | 3 +++
 src/solution/s0231_power_of_two.rs                             | 3 +++
 src/solution/s0232_implement_queue_using_stacks.rs             | 3 +++
 src/solution/s0233_number_of_digit_one.rs                      | 3 +++
 src/solution/s0238_product_of_array_except_self.rs             | 3 +++
 src/solution/s0239_sliding_window_maximum.rs                   | 3 +++
 src/solution/s0241_different_ways_to_add_parentheses.rs        | 3 +++
 src/solution/s0242_valid_anagram.rs                            | 3 +++
 src/solution/s0257_binary_tree_paths.rs                        | 3 +++
 src/solution/s0258_add_digits.rs                               | 3 +++
 src/solution/s0260_single_number_iii.rs                        | 3 +++
 src/solution/s0263_ugly_number.rs                              | 3 +++
 src/solution/s0264_ugly_number_ii.rs                           | 3 +++
 src/solution/s0268_missing_number.rs                           | 3 +++
 src/solution/s0273_integer_to_english_words.rs                 | 3 +++
 src/solution/s0274_h_index.rs                                  | 3 +++
 src/solution/s0275_h_index_ii.rs                               | 3 +++
 src/solution/s0279_perfect_squares.rs                          | 3 +++
 src/solution/s0282_expression_add_operators.rs                 | 3 +++
 src/solution/s0283_move_zeroes.rs                              | 3 +++
 src/solution/s0287_find_the_duplicate_number.rs                | 3 +++
 src/solution/s0289_game_of_life.rs                             | 3 +++
 src/solution/s0290_word_pattern.rs                             | 3 +++
 src/solution/s0292_nim_game.rs                                 | 3 +++
 src/solution/s0295_find_median_from_data_stream.rs             | 3 +++
 src/solution/s0299_bulls_and_cows.rs                           | 3 +++
 src/solution/s0300_longest_increasing_subsequence.rs           | 3 +++
 src/solution/s0301_remove_invalid_parentheses.rs               | 3 +++
 src/solution/s0303_range_sum_query_immutable.rs                | 3 +++
 src/solution/s0304_range_sum_query_2d_immutable.rs             | 3 +++
 src/solution/s0306_additive_number.rs                          | 3 +++
 src/solution/s0307_range_sum_query_mutable.rs                  | 3 +++
 .../s0309_best_time_to_buy_and_sell_stock_with_cooldown.rs     | 3 +++
 src/solution/s0310_minimum_height_trees.rs                     | 3 +++
 src/solution/s0312_burst_balloons.rs                           | 3 +++
 src/solution/s0313_super_ugly_number.rs                        | 3 +++
 src/solution/s0509_fibonacci_number.rs                         | 3 +++
 src/solution/s0704_binary_search.rs                            | 3 +++
 src/solution/s0969_pancake_sorting.rs                          | 3 +++
 src/solution/s1018_binary_prefix_divisible_by_5.rs             | 3 +++
 src/solution/s1046_last_stone_weight.rs                        | 3 +++
 237 files changed, 711 insertions(+)

diff --git a/src/solution/s0001_two_sum.rs b/src/solution/s0001_two_sum.rs
index 1d04a13e..4a44a732 100644
--- a/src/solution/s0001_two_sum.rs
+++ b/src/solution/s0001_two_sum.rs
@@ -18,6 +18,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/two-sum/
+// discuss: https://leetcode.com/problems/two-sum/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::collections::HashMap;
diff --git a/src/solution/s0002_add_two_numbers.rs b/src/solution/s0002_add_two_numbers.rs
index 5612c3d4..d8bfc2d8 100644
--- a/src/solution/s0002_add_two_numbers.rs
+++ b/src/solution/s0002_add_two_numbers.rs
@@ -19,6 +19,9 @@
 pub struct Solution {}
 use crate::util::linked_list::{to_list, ListNode};
 
+// problem: https://leetcode.com/problems/add-two-numbers/
+// discuss: https://leetcode.com/problems/add-two-numbers/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0003_longest_substring_without_repeating_characters.rs b/src/solution/s0003_longest_substring_without_repeating_characters.rs
index dca33069..0ad6903d 100644
--- a/src/solution/s0003_longest_substring_without_repeating_characters.rs
+++ b/src/solution/s0003_longest_substring_without_repeating_characters.rs
@@ -12,6 +12,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/longest-substring-without-repeating-characters/
+// discuss: https://leetcode.com/problems/longest-substring-without-repeating-characters/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0004_median_of_two_sorted_arrays.rs b/src/solution/s0004_median_of_two_sorted_arrays.rs
index b0775e14..e3c2d014 100644
--- a/src/solution/s0004_median_of_two_sorted_arrays.rs
+++ b/src/solution/s0004_median_of_two_sorted_arrays.rs
@@ -28,6 +28,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/median-of-two-sorted-arrays/
+// discuss: https://leetcode.com/problems/median-of-two-sorted-arrays/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // TODO: nth slice
diff --git a/src/solution/s0005_longest_palindromic_substring.rs b/src/solution/s0005_longest_palindromic_substring.rs
index 26a622ca..675e1951 100644
--- a/src/solution/s0005_longest_palindromic_substring.rs
+++ b/src/solution/s0005_longest_palindromic_substring.rs
@@ -21,6 +21,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/longest-palindromic-substring/
+// discuss: https://leetcode.com/problems/longest-palindromic-substring/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0006_zigzag_conversion.rs b/src/solution/s0006_zigzag_conversion.rs
index 43bf5fdc..51ed13a7 100644
--- a/src/solution/s0006_zigzag_conversion.rs
+++ b/src/solution/s0006_zigzag_conversion.rs
@@ -38,6 +38,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/zigzag-conversion/
+// discuss: https://leetcode.com/problems/zigzag-conversion/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0007_reverse_integer.rs b/src/solution/s0007_reverse_integer.rs
index d258809f..ad89eebd 100644
--- a/src/solution/s0007_reverse_integer.rs
+++ b/src/solution/s0007_reverse_integer.rs
@@ -30,6 +30,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/reverse-integer/
+// discuss: https://leetcode.com/problems/reverse-integer/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 impl Solution {
     pub fn reverse(x: i32) -> i32 {
diff --git a/src/solution/s0008_string_to_integer_atoi.rs b/src/solution/s0008_string_to_integer_atoi.rs
index 15a1eae1..9c86e17b 100644
--- a/src/solution/s0008_string_to_integer_atoi.rs
+++ b/src/solution/s0008_string_to_integer_atoi.rs
@@ -61,6 +61,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/string-to-integer-atoi/
+// discuss: https://leetcode.com/problems/string-to-integer-atoi/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0009_palindrome_number.rs b/src/solution/s0009_palindrome_number.rs
index 070077a3..255eeed1 100644
--- a/src/solution/s0009_palindrome_number.rs
+++ b/src/solution/s0009_palindrome_number.rs
@@ -33,6 +33,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/palindrome-number/
+// discuss: https://leetcode.com/problems/palindrome-number/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // TODO: not optimal, we only have to revert half of the string
diff --git a/src/solution/s0010_regular_expression_matching.rs b/src/solution/s0010_regular_expression_matching.rs
index d600e619..13e15cb7 100644
--- a/src/solution/s0010_regular_expression_matching.rs
+++ b/src/solution/s0010_regular_expression_matching.rs
@@ -69,6 +69,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/regular-expression-matching/
+// discuss: https://leetcode.com/problems/regular-expression-matching/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // TODO: NFA
diff --git a/src/solution/s0011_container_with_most_water.rs b/src/solution/s0011_container_with_most_water.rs
index a26dcfb7..ae818bac 100644
--- a/src/solution/s0011_container_with_most_water.rs
+++ b/src/solution/s0011_container_with_most_water.rs
@@ -22,6 +22,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/container-with-most-water/
+// discuss: https://leetcode.com/problems/container-with-most-water/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // Brute force: O(N^2)
diff --git a/src/solution/s0012_integer_to_roman.rs b/src/solution/s0012_integer_to_roman.rs
index 2698956e..b32592c7 100644
--- a/src/solution/s0012_integer_to_roman.rs
+++ b/src/solution/s0012_integer_to_roman.rs
@@ -61,6 +61,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/integer-to-roman/
+// discuss: https://leetcode.com/problems/integer-to-roman/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0013_roman_to_integer.rs b/src/solution/s0013_roman_to_integer.rs
index fcc2c1ad..4f3f0ae4 100644
--- a/src/solution/s0013_roman_to_integer.rs
+++ b/src/solution/s0013_roman_to_integer.rs
@@ -61,6 +61,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/roman-to-integer/
+// discuss: https://leetcode.com/problems/roman-to-integer/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0014_longest_common_prefix.rs b/src/solution/s0014_longest_common_prefix.rs
index 3d3affec..1c5fd985 100644
--- a/src/solution/s0014_longest_common_prefix.rs
+++ b/src/solution/s0014_longest_common_prefix.rs
@@ -27,6 +27,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/longest-common-prefix/
+// discuss: https://leetcode.com/problems/longest-common-prefix/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::str::Chars;
diff --git a/src/solution/s0015_3sum.rs b/src/solution/s0015_3sum.rs
index 2d4c9cca..9feb3cd0 100644
--- a/src/solution/s0015_3sum.rs
+++ b/src/solution/s0015_3sum.rs
@@ -22,6 +22,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/3sum/
+// discuss: https://leetcode.com/problems/3sum/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0016_3sum_closest.rs b/src/solution/s0016_3sum_closest.rs
index eee265b5..01cf442d 100644
--- a/src/solution/s0016_3sum_closest.rs
+++ b/src/solution/s0016_3sum_closest.rs
@@ -14,6 +14,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/3sum-closest/
+// discuss: https://leetcode.com/problems/3sum-closest/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0017_letter_combinations_of_a_phone_number.rs b/src/solution/s0017_letter_combinations_of_a_phone_number.rs
index ccd30a82..7d3245f4 100644
--- a/src/solution/s0017_letter_combinations_of_a_phone_number.rs
+++ b/src/solution/s0017_letter_combinations_of_a_phone_number.rs
@@ -21,6 +21,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/letter-combinations-of-a-phone-number/
+// discuss: https://leetcode.com/problems/letter-combinations-of-a-phone-number/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0018_4sum.rs b/src/solution/s0018_4sum.rs
index f74fa5ed..d832aef1 100644
--- a/src/solution/s0018_4sum.rs
+++ b/src/solution/s0018_4sum.rs
@@ -23,6 +23,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/4sum/
+// discuss: https://leetcode.com/problems/4sum/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // TODO: change to faster N^3 solution... maybe
diff --git a/src/solution/s0019_remove_nth_node_from_end_of_list.rs b/src/solution/s0019_remove_nth_node_from_end_of_list.rs
index b3dac826..c3f53a32 100644
--- a/src/solution/s0019_remove_nth_node_from_end_of_list.rs
+++ b/src/solution/s0019_remove_nth_node_from_end_of_list.rs
@@ -23,6 +23,9 @@
 pub struct Solution {}
 use crate::util::linked_list::{to_list, ListNode};
 
+// problem: https://leetcode.com/problems/remove-nth-node-from-end-of-list/
+// discuss: https://leetcode.com/problems/remove-nth-node-from-end-of-list/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // one pass (two pointer runner pattern) cannot make borrow checker happy
diff --git a/src/solution/s0020_valid_parentheses.rs b/src/solution/s0020_valid_parentheses.rs
index 2af69c67..3c0940b9 100644
--- a/src/solution/s0020_valid_parentheses.rs
+++ b/src/solution/s0020_valid_parentheses.rs
@@ -50,6 +50,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/valid-parentheses/
+// discuss: https://leetcode.com/problems/valid-parentheses/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0021_merge_two_sorted_lists.rs b/src/solution/s0021_merge_two_sorted_lists.rs
index c496d8e0..54d7f256 100644
--- a/src/solution/s0021_merge_two_sorted_lists.rs
+++ b/src/solution/s0021_merge_two_sorted_lists.rs
@@ -13,6 +13,9 @@
 pub struct Solution {}
 use crate::util::linked_list::{to_list, ListNode};
 
+// problem: https://leetcode.com/problems/merge-two-sorted-lists/
+// discuss: https://leetcode.com/problems/merge-two-sorted-lists/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // recursive will be much easier to understand
diff --git a/src/solution/s0022_generate_parentheses.rs b/src/solution/s0022_generate_parentheses.rs
index 887aa213..9e0e33df 100644
--- a/src/solution/s0022_generate_parentheses.rs
+++ b/src/solution/s0022_generate_parentheses.rs
@@ -20,6 +20,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/generate-parentheses/
+// discuss: https://leetcode.com/problems/generate-parentheses/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // DFS
diff --git a/src/solution/s0023_merge_k_sorted_lists.rs b/src/solution/s0023_merge_k_sorted_lists.rs
index c213eb7d..eeaf3695 100644
--- a/src/solution/s0023_merge_k_sorted_lists.rs
+++ b/src/solution/s0023_merge_k_sorted_lists.rs
@@ -19,6 +19,9 @@
 pub struct Solution {}
 use crate::util::linked_list::{to_list, ListNode};
 
+// problem: https://leetcode.com/problems/merge-k-sorted-lists/
+// discuss: https://leetcode.com/problems/merge-k-sorted-lists/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 use std::cmp::Ordering;
 use std::collections::BinaryHeap;
diff --git a/src/solution/s0024_swap_nodes_in_pairs.rs b/src/solution/s0024_swap_nodes_in_pairs.rs
index 104d6b9e..4a6deb3e 100644
--- a/src/solution/s0024_swap_nodes_in_pairs.rs
+++ b/src/solution/s0024_swap_nodes_in_pairs.rs
@@ -19,6 +19,9 @@
 pub struct Solution {}
 use crate::util::linked_list::{to_list, ListNode};
 
+// problem: https://leetcode.com/problems/swap-nodes-in-pairs/
+// discuss: https://leetcode.com/problems/swap-nodes-in-pairs/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0025_reverse_nodes_in_k_group.rs b/src/solution/s0025_reverse_nodes_in_k_group.rs
index 3beb5528..5d39cd1e 100644
--- a/src/solution/s0025_reverse_nodes_in_k_group.rs
+++ b/src/solution/s0025_reverse_nodes_in_k_group.rs
@@ -27,6 +27,9 @@
 pub struct Solution {}
 use crate::util::linked_list::{to_list, ListNode};
 
+// problem: https://leetcode.com/problems/reverse-nodes-in-k-group/
+// discuss: https://leetcode.com/problems/reverse-nodes-in-k-group/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0026_remove_duplicates_from_sorted_array.rs b/src/solution/s0026_remove_duplicates_from_sorted_array.rs
index c4b07180..29ae1485 100644
--- a/src/solution/s0026_remove_duplicates_from_sorted_array.rs
+++ b/src/solution/s0026_remove_duplicates_from_sorted_array.rs
@@ -45,6 +45,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/remove-duplicates-from-sorted-array/
+// discuss: https://leetcode.com/problems/remove-duplicates-from-sorted-array/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0027_remove_element.rs b/src/solution/s0027_remove_element.rs
index 5c11843b..7144d3e9 100644
--- a/src/solution/s0027_remove_element.rs
+++ b/src/solution/s0027_remove_element.rs
@@ -49,6 +49,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/remove-element/
+// discuss: https://leetcode.com/problems/remove-element/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0028_implement_strstr.rs b/src/solution/s0028_implement_strstr.rs
index b4bbee26..e0d944ee 100644
--- a/src/solution/s0028_implement_strstr.rs
+++ b/src/solution/s0028_implement_strstr.rs
@@ -28,6 +28,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/implement-strstr/
+// discuss: https://leetcode.com/problems/implement-strstr/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0029_divide_two_integers.rs b/src/solution/s0029_divide_two_integers.rs
index edff4f40..e8f13435 100644
--- a/src/solution/s0029_divide_two_integers.rs
+++ b/src/solution/s0029_divide_two_integers.rs
@@ -30,6 +30,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/divide-two-integers/
+// discuss: https://leetcode.com/problems/divide-two-integers/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0030_substring_with_concatenation_of_all_words.rs b/src/solution/s0030_substring_with_concatenation_of_all_words.rs
index 1c797090..002ae9a3 100644
--- a/src/solution/s0030_substring_with_concatenation_of_all_words.rs
+++ b/src/solution/s0030_substring_with_concatenation_of_all_words.rs
@@ -26,6 +26,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/substring-with-concatenation-of-all-words/
+// discuss: https://leetcode.com/problems/substring-with-concatenation-of-all-words/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 struct Term {
     expect: i32,
diff --git a/src/solution/s0031_next_permutation.rs b/src/solution/s0031_next_permutation.rs
index 459693ec..b448dfa1 100644
--- a/src/solution/s0031_next_permutation.rs
+++ b/src/solution/s0031_next_permutation.rs
@@ -16,6 +16,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/next-permutation/
+// discuss: https://leetcode.com/problems/next-permutation/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0032_longest_valid_parentheses.rs b/src/solution/s0032_longest_valid_parentheses.rs
index c6949519..d970de2b 100644
--- a/src/solution/s0032_longest_valid_parentheses.rs
+++ b/src/solution/s0032_longest_valid_parentheses.rs
@@ -22,6 +22,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/longest-valid-parentheses/
+// discuss: https://leetcode.com/problems/longest-valid-parentheses/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // time: O(N) space: O(1)
diff --git a/src/solution/s0033_search_in_rotated_sorted_array.rs b/src/solution/s0033_search_in_rotated_sorted_array.rs
index 968199f5..ab5c13d3 100644
--- a/src/solution/s0033_search_in_rotated_sorted_array.rs
+++ b/src/solution/s0033_search_in_rotated_sorted_array.rs
@@ -37,6 +37,9 @@ pub struct Solution {}
 Consider the given array as ring, each time we split the ring and judge which part is the target belong to, then it's ordinary binary search.
 */
 
+// problem: https://leetcode.com/problems/search-in-rotated-sorted-array/
+// discuss: https://leetcode.com/problems/search-in-rotated-sorted-array/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0034_find_first_and_last_position_of_element_in_sorted_array.rs b/src/solution/s0034_find_first_and_last_position_of_element_in_sorted_array.rs
index d13bfb86..eba1c01c 100644
--- a/src/solution/s0034_find_first_and_last_position_of_element_in_sorted_array.rs
+++ b/src/solution/s0034_find_first_and_last_position_of_element_in_sorted_array.rs
@@ -22,6 +22,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/find-first-and-last-position-of-element-in-sorted-array/
+// discuss: https://leetcode.com/problems/find-first-and-last-position-of-element-in-sorted-array/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // TODO
diff --git a/src/solution/s0035_search_insert_position.rs b/src/solution/s0035_search_insert_position.rs
index 30921761..31c1c38b 100644
--- a/src/solution/s0035_search_insert_position.rs
+++ b/src/solution/s0035_search_insert_position.rs
@@ -36,6 +36,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/search-insert-position/
+// discuss: https://leetcode.com/problems/search-insert-position/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // TODO
diff --git a/src/solution/s0036_valid_sudoku.rs b/src/solution/s0036_valid_sudoku.rs
index 255bab22..5a595774 100644
--- a/src/solution/s0036_valid_sudoku.rs
+++ b/src/solution/s0036_valid_sudoku.rs
@@ -64,6 +64,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/valid-sudoku/
+// discuss: https://leetcode.com/problems/valid-sudoku/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // just brute force
diff --git a/src/solution/s0037_sudoku_solver.rs b/src/solution/s0037_sudoku_solver.rs
index a848d26c..d0187582 100644
--- a/src/solution/s0037_sudoku_solver.rs
+++ b/src/solution/s0037_sudoku_solver.rs
@@ -30,6 +30,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/sudoku-solver/
+// discuss: https://leetcode.com/problems/sudoku-solver/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // TODO
diff --git a/src/solution/s0038_count_and_say.rs b/src/solution/s0038_count_and_say.rs
index 53d1c269..6305b2a5 100644
--- a/src/solution/s0038_count_and_say.rs
+++ b/src/solution/s0038_count_and_say.rs
@@ -37,6 +37,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/count-and-say/
+// discuss: https://leetcode.com/problems/count-and-say/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::char::from_digit;
diff --git a/src/solution/s0039_combination_sum.rs b/src/solution/s0039_combination_sum.rs
index e589e9a7..b31e397e 100644
--- a/src/solution/s0039_combination_sum.rs
+++ b/src/solution/s0039_combination_sum.rs
@@ -38,6 +38,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/combination-sum/
+// discuss: https://leetcode.com/problems/combination-sum/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0040_combination_sum_ii.rs b/src/solution/s0040_combination_sum_ii.rs
index a4a63011..0445bfb9 100644
--- a/src/solution/s0040_combination_sum_ii.rs
+++ b/src/solution/s0040_combination_sum_ii.rs
@@ -39,6 +39,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/combination-sum-ii/
+// discuss: https://leetcode.com/problems/combination-sum-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0041_first_missing_positive.rs b/src/solution/s0041_first_missing_positive.rs
index 72642eb2..80cd8d8e 100644
--- a/src/solution/s0041_first_missing_positive.rs
+++ b/src/solution/s0041_first_missing_positive.rs
@@ -31,6 +31,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/first-missing-positive/
+// discuss: https://leetcode.com/problems/first-missing-positive/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0042_trapping_rain_water.rs b/src/solution/s0042_trapping_rain_water.rs
index d60647dd..9d961994 100644
--- a/src/solution/s0042_trapping_rain_water.rs
+++ b/src/solution/s0042_trapping_rain_water.rs
@@ -15,6 +15,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/trapping-rain-water/
+// discuss: https://leetcode.com/problems/trapping-rain-water/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // TODO
diff --git a/src/solution/s0043_multiply_strings.rs b/src/solution/s0043_multiply_strings.rs
index a2400d6c..8c487b8e 100644
--- a/src/solution/s0043_multiply_strings.rs
+++ b/src/solution/s0043_multiply_strings.rs
@@ -28,6 +28,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/multiply-strings/
+// discuss: https://leetcode.com/problems/multiply-strings/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // TODO
diff --git a/src/solution/s0044_wildcard_matching.rs b/src/solution/s0044_wildcard_matching.rs
index c4156c36..e875131a 100644
--- a/src/solution/s0044_wildcard_matching.rs
+++ b/src/solution/s0044_wildcard_matching.rs
@@ -69,6 +69,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/wildcard-matching/
+// discuss: https://leetcode.com/problems/wildcard-matching/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0045_jump_game_ii.rs b/src/solution/s0045_jump_game_ii.rs
index 1f2de2aa..3922e20b 100644
--- a/src/solution/s0045_jump_game_ii.rs
+++ b/src/solution/s0045_jump_game_ii.rs
@@ -22,6 +22,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/jump-game-ii/
+// discuss: https://leetcode.com/problems/jump-game-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // TODO: shortest path from backward
diff --git a/src/solution/s0046_permutations.rs b/src/solution/s0046_permutations.rs
index a6cdb8dd..ef9354c8 100644
--- a/src/solution/s0046_permutations.rs
+++ b/src/solution/s0046_permutations.rs
@@ -21,6 +21,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/permutations/
+// discuss: https://leetcode.com/problems/permutations/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0047_permutations_ii.rs b/src/solution/s0047_permutations_ii.rs
index 22aef579..7dceb55b 100644
--- a/src/solution/s0047_permutations_ii.rs
+++ b/src/solution/s0047_permutations_ii.rs
@@ -18,6 +18,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/permutations-ii/
+// discuss: https://leetcode.com/problems/permutations-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0048_rotate_image.rs b/src/solution/s0048_rotate_image.rs
index 01145b47..6f6fdffa 100644
--- a/src/solution/s0048_rotate_image.rs
+++ b/src/solution/s0048_rotate_image.rs
@@ -50,6 +50,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/rotate-image/
+// discuss: https://leetcode.com/problems/rotate-image/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // x,y ->  y,n-x     2-dimension vector rotate -90 degree:
diff --git a/src/solution/s0049_group_anagrams.rs b/src/solution/s0049_group_anagrams.rs
index 737dc03b..64200ea3 100644
--- a/src/solution/s0049_group_anagrams.rs
+++ b/src/solution/s0049_group_anagrams.rs
@@ -24,6 +24,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/group-anagrams/
+// discuss: https://leetcode.com/problems/group-anagrams/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::collections::HashMap;
diff --git a/src/solution/s0050_powx_n.rs b/src/solution/s0050_powx_n.rs
index 6e89f90c..3e2e9b3e 100644
--- a/src/solution/s0050_powx_n.rs
+++ b/src/solution/s0050_powx_n.rs
@@ -35,6 +35,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/powx-n/
+// discuss: https://leetcode.com/problems/powx-n/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0051_n_queens.rs b/src/solution/s0051_n_queens.rs
index 98fd9480..d78435a9 100644
--- a/src/solution/s0051_n_queens.rs
+++ b/src/solution/s0051_n_queens.rs
@@ -30,6 +30,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/n-queens/
+// discuss: https://leetcode.com/problems/n-queens/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0052_n_queens_ii.rs b/src/solution/s0052_n_queens_ii.rs
index 873cdda5..7c9b1987 100644
--- a/src/solution/s0052_n_queens_ii.rs
+++ b/src/solution/s0052_n_queens_ii.rs
@@ -29,6 +29,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/n-queens-ii/
+// discuss: https://leetcode.com/problems/n-queens-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0053_maximum_subarray.rs b/src/solution/s0053_maximum_subarray.rs
index 72b8b234..7967fb00 100644
--- a/src/solution/s0053_maximum_subarray.rs
+++ b/src/solution/s0053_maximum_subarray.rs
@@ -18,6 +18,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/maximum-subarray/
+// discuss: https://leetcode.com/problems/maximum-subarray/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0054_spiral_matrix.rs b/src/solution/s0054_spiral_matrix.rs
index a2a8f009..ac90b769 100644
--- a/src/solution/s0054_spiral_matrix.rs
+++ b/src/solution/s0054_spiral_matrix.rs
@@ -28,6 +28,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/spiral-matrix/
+// discuss: https://leetcode.com/problems/spiral-matrix/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0055_jump_game.rs b/src/solution/s0055_jump_game.rs
index a3634424..8dc35842 100644
--- a/src/solution/s0055_jump_game.rs
+++ b/src/solution/s0055_jump_game.rs
@@ -27,6 +27,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/jump-game/
+// discuss: https://leetcode.com/problems/jump-game/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0056_merge_intervals.rs b/src/solution/s0056_merge_intervals.rs
index 37b7ade4..108c043b 100644
--- a/src/solution/s0056_merge_intervals.rs
+++ b/src/solution/s0056_merge_intervals.rs
@@ -21,6 +21,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/merge-intervals/
+// discuss: https://leetcode.com/problems/merge-intervals/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // Definition for an interval.
diff --git a/src/solution/s0057_insert_interval.rs b/src/solution/s0057_insert_interval.rs
index 90294a03..0afe62b4 100644
--- a/src/solution/s0057_insert_interval.rs
+++ b/src/solution/s0057_insert_interval.rs
@@ -22,6 +22,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/insert-interval/
+// discuss: https://leetcode.com/problems/insert-interval/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // Definition for an interval.
diff --git a/src/solution/s0058_length_of_last_word.rs b/src/solution/s0058_length_of_last_word.rs
index acd47197..4889c739 100644
--- a/src/solution/s0058_length_of_last_word.rs
+++ b/src/solution/s0058_length_of_last_word.rs
@@ -16,6 +16,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/length-of-last-word/
+// discuss: https://leetcode.com/problems/length-of-last-word/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0059_spiral_matrix_ii.rs b/src/solution/s0059_spiral_matrix_ii.rs
index a9259672..d54f57b4 100644
--- a/src/solution/s0059_spiral_matrix_ii.rs
+++ b/src/solution/s0059_spiral_matrix_ii.rs
@@ -18,6 +18,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/spiral-matrix-ii/
+// discuss: https://leetcode.com/problems/spiral-matrix-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0060_permutation_sequence.rs b/src/solution/s0060_permutation_sequence.rs
index db0e84d5..0136a0b4 100644
--- a/src/solution/s0060_permutation_sequence.rs
+++ b/src/solution/s0060_permutation_sequence.rs
@@ -40,6 +40,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/permutation-sequence/
+// discuss: https://leetcode.com/problems/permutation-sequence/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // target: split k = i! + j! + ...
diff --git a/src/solution/s0061_rotate_list.rs b/src/solution/s0061_rotate_list.rs
index b7723576..bbfb059f 100644
--- a/src/solution/s0061_rotate_list.rs
+++ b/src/solution/s0061_rotate_list.rs
@@ -28,6 +28,9 @@
 pub struct Solution {}
 use crate::util::linked_list::{to_list, ListNode};
 
+// problem: https://leetcode.com/problems/rotate-list/
+// discuss: https://leetcode.com/problems/rotate-list/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0062_unique_paths.rs b/src/solution/s0062_unique_paths.rs
index fd3586fe..3a158326 100644
--- a/src/solution/s0062_unique_paths.rs
+++ b/src/solution/s0062_unique_paths.rs
@@ -33,6 +33,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/unique-paths/
+// discuss: https://leetcode.com/problems/unique-paths/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // its high school math: C(r,n) = n! / r!(n-r)! ...are you fxxking kidding me?
diff --git a/src/solution/s0063_unique_paths_ii.rs b/src/solution/s0063_unique_paths_ii.rs
index 84839e23..04d84911 100644
--- a/src/solution/s0063_unique_paths_ii.rs
+++ b/src/solution/s0063_unique_paths_ii.rs
@@ -33,6 +33,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/unique-paths-ii/
+// discuss: https://leetcode.com/problems/unique-paths-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // Bottom-Up DP
diff --git a/src/solution/s0064_minimum_path_sum.rs b/src/solution/s0064_minimum_path_sum.rs
index 6500e2a3..d6340d50 100644
--- a/src/solution/s0064_minimum_path_sum.rs
+++ b/src/solution/s0064_minimum_path_sum.rs
@@ -21,6 +21,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/minimum-path-sum/
+// discuss: https://leetcode.com/problems/minimum-path-sum/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0065_valid_number.rs b/src/solution/s0065_valid_number.rs
index 0370784c..11c5753d 100644
--- a/src/solution/s0065_valid_number.rs
+++ b/src/solution/s0065_valid_number.rs
@@ -36,6 +36,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/valid-number/
+// discuss: https://leetcode.com/problems/valid-number/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // hope that regex was included in std library...
diff --git a/src/solution/s0066_plus_one.rs b/src/solution/s0066_plus_one.rs
index ab0bda1a..fb1ea045 100644
--- a/src/solution/s0066_plus_one.rs
+++ b/src/solution/s0066_plus_one.rs
@@ -26,6 +26,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/plus-one/
+// discuss: https://leetcode.com/problems/plus-one/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0067_add_binary.rs b/src/solution/s0067_add_binary.rs
index 715824f5..8c9951cc 100644
--- a/src/solution/s0067_add_binary.rs
+++ b/src/solution/s0067_add_binary.rs
@@ -20,6 +20,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/add-binary/
+// discuss: https://leetcode.com/problems/add-binary/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::char::from_digit;
diff --git a/src/solution/s0068_text_justification.rs b/src/solution/s0068_text_justification.rs
index 2d8a4fd2..827fa4f8 100644
--- a/src/solution/s0068_text_justification.rs
+++ b/src/solution/s0068_text_justification.rs
@@ -69,6 +69,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/text-justification/
+// discuss: https://leetcode.com/problems/text-justification/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0069_sqrtx.rs b/src/solution/s0069_sqrtx.rs
index 5c15c63b..256f88be 100644
--- a/src/solution/s0069_sqrtx.rs
+++ b/src/solution/s0069_sqrtx.rs
@@ -26,6 +26,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/sqrtx/
+// discuss: https://leetcode.com/problems/sqrtx/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // Newton-Raphson for: root^2 - n = 0
diff --git a/src/solution/s0070_climbing_stairs.rs b/src/solution/s0070_climbing_stairs.rs
index 4a9b44f0..2ef4153b 100644
--- a/src/solution/s0070_climbing_stairs.rs
+++ b/src/solution/s0070_climbing_stairs.rs
@@ -31,6 +31,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/climbing-stairs/
+// discuss: https://leetcode.com/problems/climbing-stairs/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // Bottom-up DP
diff --git a/src/solution/s0071_simplify_path.rs b/src/solution/s0071_simplify_path.rs
index 6b6b909c..4b61f7be 100644
--- a/src/solution/s0071_simplify_path.rs
+++ b/src/solution/s0071_simplify_path.rs
@@ -57,6 +57,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/simplify-path/
+// discuss: https://leetcode.com/problems/simplify-path/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0072_edit_distance.rs b/src/solution/s0072_edit_distance.rs
index 280518c6..d50d9fa3 100644
--- a/src/solution/s0072_edit_distance.rs
+++ b/src/solution/s0072_edit_distance.rs
@@ -38,6 +38,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/edit-distance/
+// discuss: https://leetcode.com/problems/edit-distance/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0073_set_matrix_zeroes.rs b/src/solution/s0073_set_matrix_zeroes.rs
index cdc73324..8d8cdab8 100644
--- a/src/solution/s0073_set_matrix_zeroes.rs
+++ b/src/solution/s0073_set_matrix_zeroes.rs
@@ -48,6 +48,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/set-matrix-zeroes/
+// discuss: https://leetcode.com/problems/set-matrix-zeroes/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0074_search_a_2d_matrix.rs b/src/solution/s0074_search_a_2d_matrix.rs
index d535f16e..90975918 100644
--- a/src/solution/s0074_search_a_2d_matrix.rs
+++ b/src/solution/s0074_search_a_2d_matrix.rs
@@ -36,6 +36,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/search-a-2d-matrix/
+// discuss: https://leetcode.com/problems/search-a-2d-matrix/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0075_sort_colors.rs b/src/solution/s0075_sort_colors.rs
index 8276ea52..6b72ac88 100644
--- a/src/solution/s0075_sort_colors.rs
+++ b/src/solution/s0075_sort_colors.rs
@@ -24,6 +24,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/sort-colors/
+// discuss: https://leetcode.com/problems/sort-colors/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // three-way partition
diff --git a/src/solution/s0076_minimum_window_substring.rs b/src/solution/s0076_minimum_window_substring.rs
index 1eaa1ab9..9d190533 100644
--- a/src/solution/s0076_minimum_window_substring.rs
+++ b/src/solution/s0076_minimum_window_substring.rs
@@ -20,6 +20,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/minimum-window-substring/
+// discuss: https://leetcode.com/problems/minimum-window-substring/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 use std::collections::HashMap;
 impl Solution {
diff --git a/src/solution/s0077_combinations.rs b/src/solution/s0077_combinations.rs
index c5e56f80..6bb10d6b 100644
--- a/src/solution/s0077_combinations.rs
+++ b/src/solution/s0077_combinations.rs
@@ -21,6 +21,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/combinations/
+// discuss: https://leetcode.com/problems/combinations/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0078_subsets.rs b/src/solution/s0078_subsets.rs
index 95757486..2db34925 100644
--- a/src/solution/s0078_subsets.rs
+++ b/src/solution/s0078_subsets.rs
@@ -24,6 +24,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/subsets/
+// discuss: https://leetcode.com/problems/subsets/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0079_word_search.rs b/src/solution/s0079_word_search.rs
index fa02e3ad..07c4a705 100644
--- a/src/solution/s0079_word_search.rs
+++ b/src/solution/s0079_word_search.rs
@@ -23,6 +23,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/word-search/
+// discuss: https://leetcode.com/problems/word-search/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // TODO: use HashSet to record visited pos
diff --git a/src/solution/s0080_remove_duplicates_from_sorted_array_ii.rs b/src/solution/s0080_remove_duplicates_from_sorted_array_ii.rs
index 1ba2e2e9..70b3cf82 100644
--- a/src/solution/s0080_remove_duplicates_from_sorted_array_ii.rs
+++ b/src/solution/s0080_remove_duplicates_from_sorted_array_ii.rs
@@ -46,6 +46,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/remove-duplicates-from-sorted-array-ii/
+// discuss: https://leetcode.com/problems/remove-duplicates-from-sorted-array-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0081_search_in_rotated_sorted_array_ii.rs b/src/solution/s0081_search_in_rotated_sorted_array_ii.rs
index d7f841d7..7972a16f 100644
--- a/src/solution/s0081_search_in_rotated_sorted_array_ii.rs
+++ b/src/solution/s0081_search_in_rotated_sorted_array_ii.rs
@@ -30,6 +30,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/search-in-rotated-sorted-array-ii/
+// discuss: https://leetcode.com/problems/search-in-rotated-sorted-array-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0082_remove_duplicates_from_sorted_list_ii.rs b/src/solution/s0082_remove_duplicates_from_sorted_list_ii.rs
index d04b15f8..067d0c79 100644
--- a/src/solution/s0082_remove_duplicates_from_sorted_list_ii.rs
+++ b/src/solution/s0082_remove_duplicates_from_sorted_list_ii.rs
@@ -21,6 +21,9 @@
 pub struct Solution {}
 use crate::util::linked_list::{to_list, ListNode};
 
+// problem: https://leetcode.com/problems/remove-duplicates-from-sorted-list-ii/
+// discuss: https://leetcode.com/problems/remove-duplicates-from-sorted-list-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // Definition for singly-linked list.
diff --git a/src/solution/s0083_remove_duplicates_from_sorted_list.rs b/src/solution/s0083_remove_duplicates_from_sorted_list.rs
index 785cc03f..5c9552cc 100644
--- a/src/solution/s0083_remove_duplicates_from_sorted_list.rs
+++ b/src/solution/s0083_remove_duplicates_from_sorted_list.rs
@@ -21,6 +21,9 @@
 pub struct Solution {}
 use crate::util::linked_list::{to_list, ListNode};
 
+// problem: https://leetcode.com/problems/remove-duplicates-from-sorted-list/
+// discuss: https://leetcode.com/problems/remove-duplicates-from-sorted-list/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // Definition for singly-linked list.
diff --git a/src/solution/s0084_largest_rectangle_in_histogram.rs b/src/solution/s0084_largest_rectangle_in_histogram.rs
index 19b845a0..d33b9bda 100644
--- a/src/solution/s0084_largest_rectangle_in_histogram.rs
+++ b/src/solution/s0084_largest_rectangle_in_histogram.rs
@@ -25,6 +25,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/largest-rectangle-in-histogram/
+// discuss: https://leetcode.com/problems/largest-rectangle-in-histogram/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // record the height and start position using 2 stack, thus we reuse the previously scanned information
diff --git a/src/solution/s0085_maximal_rectangle.rs b/src/solution/s0085_maximal_rectangle.rs
index 878236ef..6dbf2951 100644
--- a/src/solution/s0085_maximal_rectangle.rs
+++ b/src/solution/s0085_maximal_rectangle.rs
@@ -19,6 +19,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/maximal-rectangle/
+// discuss: https://leetcode.com/problems/maximal-rectangle/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0086_partition_list.rs b/src/solution/s0086_partition_list.rs
index d30a9053..1f4952dd 100644
--- a/src/solution/s0086_partition_list.rs
+++ b/src/solution/s0086_partition_list.rs
@@ -16,6 +16,9 @@
 pub struct Solution {}
 use crate::util::linked_list::{to_list, ListNode};
 
+// problem: https://leetcode.com/problems/partition-list/
+// discuss: https://leetcode.com/problems/partition-list/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0087_scramble_string.rs b/src/solution/s0087_scramble_string.rs
index 5b70a69a..19b47dc0 100644
--- a/src/solution/s0087_scramble_string.rs
+++ b/src/solution/s0087_scramble_string.rs
@@ -63,6 +63,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/scramble-string/
+// discuss: https://leetcode.com/problems/scramble-string/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0088_merge_sorted_array.rs b/src/solution/s0088_merge_sorted_array.rs
index 955d5ad9..bdcc2a1a 100644
--- a/src/solution/s0088_merge_sorted_array.rs
+++ b/src/solution/s0088_merge_sorted_array.rs
@@ -23,6 +23,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/merge-sorted-array/
+// discuss: https://leetcode.com/problems/merge-sorted-array/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0089_gray_code.rs b/src/solution/s0089_gray_code.rs
index 0bc4ffc0..039283eb 100644
--- a/src/solution/s0089_gray_code.rs
+++ b/src/solution/s0089_gray_code.rs
@@ -38,6 +38,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/gray-code/
+// discuss: https://leetcode.com/problems/gray-code/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0090_subsets_ii.rs b/src/solution/s0090_subsets_ii.rs
index 80d17be6..e859e2d1 100644
--- a/src/solution/s0090_subsets_ii.rs
+++ b/src/solution/s0090_subsets_ii.rs
@@ -23,6 +23,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/subsets-ii/
+// discuss: https://leetcode.com/problems/subsets-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0091_decode_ways.rs b/src/solution/s0091_decode_ways.rs
index a181c137..bbecc932 100644
--- a/src/solution/s0091_decode_ways.rs
+++ b/src/solution/s0091_decode_ways.rs
@@ -30,6 +30,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/decode-ways/
+// discuss: https://leetcode.com/problems/decode-ways/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0092_reverse_linked_list_ii.rs b/src/solution/s0092_reverse_linked_list_ii.rs
index e84035da..318c0d15 100644
--- a/src/solution/s0092_reverse_linked_list_ii.rs
+++ b/src/solution/s0092_reverse_linked_list_ii.rs
@@ -16,6 +16,9 @@
 pub struct Solution {}
 use crate::util::linked_list::{to_list, ListNode};
 
+// problem: https://leetcode.com/problems/reverse-linked-list-ii/
+// discuss: https://leetcode.com/problems/reverse-linked-list-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // Definition for singly-linked list.
diff --git a/src/solution/s0093_restore_ip_addresses.rs b/src/solution/s0093_restore_ip_addresses.rs
index 08d0a8ec..5c2706b4 100644
--- a/src/solution/s0093_restore_ip_addresses.rs
+++ b/src/solution/s0093_restore_ip_addresses.rs
@@ -13,6 +13,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/restore-ip-addresses/
+// discuss: https://leetcode.com/problems/restore-ip-addresses/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0094_binary_tree_inorder_traversal.rs b/src/solution/s0094_binary_tree_inorder_traversal.rs
index d4d2ea2a..01afb57a 100644
--- a/src/solution/s0094_binary_tree_inorder_traversal.rs
+++ b/src/solution/s0094_binary_tree_inorder_traversal.rs
@@ -20,6 +20,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/binary-tree-inorder-traversal/
+// discuss: https://leetcode.com/problems/binary-tree-inorder-traversal/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use crate::util::tree::{to_tree, TreeNode};
diff --git a/src/solution/s0095_unique_binary_search_trees_ii.rs b/src/solution/s0095_unique_binary_search_trees_ii.rs
index ffdc763b..1f75639d 100644
--- a/src/solution/s0095_unique_binary_search_trees_ii.rs
+++ b/src/solution/s0095_unique_binary_search_trees_ii.rs
@@ -27,6 +27,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/unique-binary-search-trees-ii/
+// discuss: https://leetcode.com/problems/unique-binary-search-trees-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0096_unique_binary_search_trees.rs b/src/solution/s0096_unique_binary_search_trees.rs
index 7124a2bf..4f64c26c 100644
--- a/src/solution/s0096_unique_binary_search_trees.rs
+++ b/src/solution/s0096_unique_binary_search_trees.rs
@@ -21,6 +21,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/unique-binary-search-trees/
+// discuss: https://leetcode.com/problems/unique-binary-search-trees/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0097_interleaving_string.rs b/src/solution/s0097_interleaving_string.rs
index 5741bb7c..8d69d851 100644
--- a/src/solution/s0097_interleaving_string.rs
+++ b/src/solution/s0097_interleaving_string.rs
@@ -20,6 +20,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/interleaving-string/
+// discuss: https://leetcode.com/problems/interleaving-string/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // DFS with memorization
diff --git a/src/solution/s0098_validate_binary_search_tree.rs b/src/solution/s0098_validate_binary_search_tree.rs
index 7f55a47e..09098c18 100644
--- a/src/solution/s0098_validate_binary_search_tree.rs
+++ b/src/solution/s0098_validate_binary_search_tree.rs
@@ -37,6 +37,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/validate-binary-search-tree/
+// discuss: https://leetcode.com/problems/validate-binary-search-tree/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // Definition for a binary tree node.
diff --git a/src/solution/s0099_recover_binary_search_tree.rs b/src/solution/s0099_recover_binary_search_tree.rs
index 3b92da04..2401231a 100644
--- a/src/solution/s0099_recover_binary_search_tree.rs
+++ b/src/solution/s0099_recover_binary_search_tree.rs
@@ -57,6 +57,9 @@ pub struct Solution {}
 
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/recover-binary-search-tree/
+// discuss: https://leetcode.com/problems/recover-binary-search-tree/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0100_same_tree.rs b/src/solution/s0100_same_tree.rs
index f1ca1972..c7dc1372 100644
--- a/src/solution/s0100_same_tree.rs
+++ b/src/solution/s0100_same_tree.rs
@@ -45,6 +45,9 @@
 pub struct Solution {}
 
 use crate::util::tree::{to_tree, TreeNode};
+// problem: https://leetcode.com/problems/same-tree/
+// discuss: https://leetcode.com/problems/same-tree/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 use std::cell::RefCell;
 use std::rc::Rc;
diff --git a/src/solution/s0101_symmetric_tree.rs b/src/solution/s0101_symmetric_tree.rs
index c62962d2..41f44bc8 100644
--- a/src/solution/s0101_symmetric_tree.rs
+++ b/src/solution/s0101_symmetric_tree.rs
@@ -32,6 +32,9 @@
 pub struct Solution {}
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/symmetric-tree/
+// discuss: https://leetcode.com/problems/symmetric-tree/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cell::RefCell;
diff --git a/src/solution/s0102_binary_tree_level_order_traversal.rs b/src/solution/s0102_binary_tree_level_order_traversal.rs
index 42f782a5..a5a3fd13 100644
--- a/src/solution/s0102_binary_tree_level_order_traversal.rs
+++ b/src/solution/s0102_binary_tree_level_order_traversal.rs
@@ -28,6 +28,9 @@
 pub struct Solution {}
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/binary-tree-level-order-traversal/
+// discuss: https://leetcode.com/problems/binary-tree-level-order-traversal/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cell::RefCell;
diff --git a/src/solution/s0103_binary_tree_zigzag_level_order_traversal.rs b/src/solution/s0103_binary_tree_zigzag_level_order_traversal.rs
index 96476fda..78aa7b5e 100644
--- a/src/solution/s0103_binary_tree_zigzag_level_order_traversal.rs
+++ b/src/solution/s0103_binary_tree_zigzag_level_order_traversal.rs
@@ -28,6 +28,9 @@
 pub struct Solution {}
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal/
+// discuss: https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cell::RefCell;
diff --git a/src/solution/s0104_maximum_depth_of_binary_tree.rs b/src/solution/s0104_maximum_depth_of_binary_tree.rs
index 6d2f18e6..2b2a51d4 100644
--- a/src/solution/s0104_maximum_depth_of_binary_tree.rs
+++ b/src/solution/s0104_maximum_depth_of_binary_tree.rs
@@ -24,6 +24,9 @@
 pub struct Solution {}
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/maximum-depth-of-binary-tree/
+// discuss: https://leetcode.com/problems/maximum-depth-of-binary-tree/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cell::RefCell;
diff --git a/src/solution/s0105_construct_binary_tree_from_preorder_and_inorder_traversal.rs b/src/solution/s0105_construct_binary_tree_from_preorder_and_inorder_traversal.rs
index e271faa5..809ae654 100644
--- a/src/solution/s0105_construct_binary_tree_from_preorder_and_inorder_traversal.rs
+++ b/src/solution/s0105_construct_binary_tree_from_preorder_and_inorder_traversal.rs
@@ -25,6 +25,9 @@
 pub struct Solution {}
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal/
+// discuss: https://leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cell::RefCell;
diff --git a/src/solution/s0106_construct_binary_tree_from_inorder_and_postorder_traversal.rs b/src/solution/s0106_construct_binary_tree_from_inorder_and_postorder_traversal.rs
index 63c469be..df215bbc 100644
--- a/src/solution/s0106_construct_binary_tree_from_inorder_and_postorder_traversal.rs
+++ b/src/solution/s0106_construct_binary_tree_from_inorder_and_postorder_traversal.rs
@@ -26,6 +26,9 @@
 pub struct Solution {}
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/construct-binary-tree-from-inorder-and-postorder-traversal/
+// discuss: https://leetcode.com/problems/construct-binary-tree-from-inorder-and-postorder-traversal/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cell::RefCell;
diff --git a/src/solution/s0107_binary_tree_level_order_traversal_ii.rs b/src/solution/s0107_binary_tree_level_order_traversal_ii.rs
index f77229a6..4b74e0d7 100644
--- a/src/solution/s0107_binary_tree_level_order_traversal_ii.rs
+++ b/src/solution/s0107_binary_tree_level_order_traversal_ii.rs
@@ -28,6 +28,9 @@
 pub struct Solution {}
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/binary-tree-level-order-traversal-ii/
+// discuss: https://leetcode.com/problems/binary-tree-level-order-traversal-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cell::RefCell;
diff --git a/src/solution/s0108_convert_sorted_array_to_binary_search_tree.rs b/src/solution/s0108_convert_sorted_array_to_binary_search_tree.rs
index 67e4b2ac..2cefab5c 100644
--- a/src/solution/s0108_convert_sorted_array_to_binary_search_tree.rs
+++ b/src/solution/s0108_convert_sorted_array_to_binary_search_tree.rs
@@ -23,6 +23,9 @@
 pub struct Solution {}
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/convert-sorted-array-to-binary-search-tree/
+// discuss: https://leetcode.com/problems/convert-sorted-array-to-binary-search-tree/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cell::RefCell;
diff --git a/src/solution/s0109_convert_sorted_list_to_binary_search_tree.rs b/src/solution/s0109_convert_sorted_list_to_binary_search_tree.rs
index 6bb37b0e..e2070965 100644
--- a/src/solution/s0109_convert_sorted_list_to_binary_search_tree.rs
+++ b/src/solution/s0109_convert_sorted_list_to_binary_search_tree.rs
@@ -24,6 +24,9 @@ pub struct Solution {}
 use crate::util::linked_list::{to_list, ListNode};
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/convert-sorted-list-to-binary-search-tree/
+// discuss: https://leetcode.com/problems/convert-sorted-list-to-binary-search-tree/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cell::RefCell;
diff --git a/src/solution/s0110_balanced_binary_tree.rs b/src/solution/s0110_balanced_binary_tree.rs
index bb067d02..c3171126 100644
--- a/src/solution/s0110_balanced_binary_tree.rs
+++ b/src/solution/s0110_balanced_binary_tree.rs
@@ -42,6 +42,9 @@
 pub struct Solution {}
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/balanced-binary-tree/
+// discuss: https://leetcode.com/problems/balanced-binary-tree/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cell::RefCell;
diff --git a/src/solution/s0111_minimum_depth_of_binary_tree.rs b/src/solution/s0111_minimum_depth_of_binary_tree.rs
index 1efb759d..a73e49f0 100644
--- a/src/solution/s0111_minimum_depth_of_binary_tree.rs
+++ b/src/solution/s0111_minimum_depth_of_binary_tree.rs
@@ -24,6 +24,9 @@
 pub struct Solution {}
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/minimum-depth-of-binary-tree/
+// discuss: https://leetcode.com/problems/minimum-depth-of-binary-tree/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cell::RefCell;
diff --git a/src/solution/s0112_path_sum.rs b/src/solution/s0112_path_sum.rs
index 2f036b21..e2e0a235 100644
--- a/src/solution/s0112_path_sum.rs
+++ b/src/solution/s0112_path_sum.rs
@@ -25,6 +25,9 @@
 pub struct Solution {}
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/path-sum/
+// discuss: https://leetcode.com/problems/path-sum/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cell::RefCell;
diff --git a/src/solution/s0113_path_sum_ii.rs b/src/solution/s0113_path_sum_ii.rs
index d567e693..106d1921 100644
--- a/src/solution/s0113_path_sum_ii.rs
+++ b/src/solution/s0113_path_sum_ii.rs
@@ -32,6 +32,9 @@
 pub struct Solution {}
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/path-sum-ii/
+// discuss: https://leetcode.com/problems/path-sum-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cell::RefCell;
diff --git a/src/solution/s0114_flatten_binary_tree_to_linked_list.rs b/src/solution/s0114_flatten_binary_tree_to_linked_list.rs
index 9661e9e7..63668c47 100644
--- a/src/solution/s0114_flatten_binary_tree_to_linked_list.rs
+++ b/src/solution/s0114_flatten_binary_tree_to_linked_list.rs
@@ -33,6 +33,9 @@
 pub struct Solution {}
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/flatten-binary-tree-to-linked-list/
+// discuss: https://leetcode.com/problems/flatten-binary-tree-to-linked-list/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cell::RefCell;
diff --git a/src/solution/s0115_distinct_subsequences.rs b/src/solution/s0115_distinct_subsequences.rs
index f67304f6..7af3d08b 100644
--- a/src/solution/s0115_distinct_subsequences.rs
+++ b/src/solution/s0115_distinct_subsequences.rs
@@ -48,6 +48,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/distinct-subsequences/
+// discuss: https://leetcode.com/problems/distinct-subsequences/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0118_pascals_triangle.rs b/src/solution/s0118_pascals_triangle.rs
index a69d64e4..d593242d 100644
--- a/src/solution/s0118_pascals_triangle.rs
+++ b/src/solution/s0118_pascals_triangle.rs
@@ -23,6 +23,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/pascals-triangle/
+// discuss: https://leetcode.com/problems/pascals-triangle/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0119_pascals_triangle_ii.rs b/src/solution/s0119_pascals_triangle_ii.rs
index 5129ed5a..588a9835 100644
--- a/src/solution/s0119_pascals_triangle_ii.rs
+++ b/src/solution/s0119_pascals_triangle_ii.rs
@@ -22,6 +22,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/pascals-triangle-ii/
+// discuss: https://leetcode.com/problems/pascals-triangle-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0120_triangle.rs b/src/solution/s0120_triangle.rs
index 4a96591a..93c38d33 100644
--- a/src/solution/s0120_triangle.rs
+++ b/src/solution/s0120_triangle.rs
@@ -23,6 +23,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/triangle/
+// discuss: https://leetcode.com/problems/triangle/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0121_best_time_to_buy_and_sell_stock.rs b/src/solution/s0121_best_time_to_buy_and_sell_stock.rs
index fa27fc10..d5d3746d 100644
--- a/src/solution/s0121_best_time_to_buy_and_sell_stock.rs
+++ b/src/solution/s0121_best_time_to_buy_and_sell_stock.rs
@@ -27,6 +27,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/best-time-to-buy-and-sell-stock/
+// discuss: https://leetcode.com/problems/best-time-to-buy-and-sell-stock/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0122_best_time_to_buy_and_sell_stock_ii.rs b/src/solution/s0122_best_time_to_buy_and_sell_stock_ii.rs
index 7b376e6b..803c71b6 100644
--- a/src/solution/s0122_best_time_to_buy_and_sell_stock_ii.rs
+++ b/src/solution/s0122_best_time_to_buy_and_sell_stock_ii.rs
@@ -36,6 +36,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/best-time-to-buy-and-sell-stock-ii/
+// discuss: https://leetcode.com/problems/best-time-to-buy-and-sell-stock-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0123_best_time_to_buy_and_sell_stock_iii.rs b/src/solution/s0123_best_time_to_buy_and_sell_stock_iii.rs
index 3907c044..bb068273 100644
--- a/src/solution/s0123_best_time_to_buy_and_sell_stock_iii.rs
+++ b/src/solution/s0123_best_time_to_buy_and_sell_stock_iii.rs
@@ -35,6 +35,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/best-time-to-buy-and-sell-stock-iii/
+// discuss: https://leetcode.com/problems/best-time-to-buy-and-sell-stock-iii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0124_binary_tree_maximum_path_sum.rs b/src/solution/s0124_binary_tree_maximum_path_sum.rs
index f76f3178..e7c57b49 100644
--- a/src/solution/s0124_binary_tree_maximum_path_sum.rs
+++ b/src/solution/s0124_binary_tree_maximum_path_sum.rs
@@ -35,6 +35,9 @@
 pub struct Solution {}
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/binary-tree-maximum-path-sum/
+// discuss: https://leetcode.com/problems/binary-tree-maximum-path-sum/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0125_valid_palindrome.rs b/src/solution/s0125_valid_palindrome.rs
index b325ac0c..2f090b72 100644
--- a/src/solution/s0125_valid_palindrome.rs
+++ b/src/solution/s0125_valid_palindrome.rs
@@ -22,6 +22,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/valid-palindrome/
+// discuss: https://leetcode.com/problems/valid-palindrome/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0126_word_ladder_ii.rs b/src/solution/s0126_word_ladder_ii.rs
index b9de6f4c..32169865 100644
--- a/src/solution/s0126_word_ladder_ii.rs
+++ b/src/solution/s0126_word_ladder_ii.rs
@@ -52,6 +52,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/word-ladder-ii/
+// discuss: https://leetcode.com/problems/word-ladder-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0127_word_ladder.rs b/src/solution/s0127_word_ladder.rs
index 6c8fbfa6..a67465fa 100644
--- a/src/solution/s0127_word_ladder.rs
+++ b/src/solution/s0127_word_ladder.rs
@@ -47,6 +47,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/word-ladder/
+// discuss: https://leetcode.com/problems/word-ladder/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::collections::HashSet;
diff --git a/src/solution/s0128_longest_consecutive_sequence.rs b/src/solution/s0128_longest_consecutive_sequence.rs
index ef77362b..f0e0806f 100644
--- a/src/solution/s0128_longest_consecutive_sequence.rs
+++ b/src/solution/s0128_longest_consecutive_sequence.rs
@@ -16,6 +16,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/longest-consecutive-sequence/
+// discuss: https://leetcode.com/problems/longest-consecutive-sequence/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0129_sum_root_to_leaf_numbers.rs b/src/solution/s0129_sum_root_to_leaf_numbers.rs
index c52dc94c..1e44fb68 100644
--- a/src/solution/s0129_sum_root_to_leaf_numbers.rs
+++ b/src/solution/s0129_sum_root_to_leaf_numbers.rs
@@ -42,6 +42,9 @@
 pub struct Solution {}
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/sum-root-to-leaf-numbers/
+// discuss: https://leetcode.com/problems/sum-root-to-leaf-numbers/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cell::RefCell;
diff --git a/src/solution/s0130_surrounded_regions.rs b/src/solution/s0130_surrounded_regions.rs
index 90135ae8..411286b4 100644
--- a/src/solution/s0130_surrounded_regions.rs
+++ b/src/solution/s0130_surrounded_regions.rs
@@ -30,6 +30,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/surrounded-regions/
+// discuss: https://leetcode.com/problems/surrounded-regions/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0131_palindrome_partitioning.rs b/src/solution/s0131_palindrome_partitioning.rs
index a9f52608..22a92dfd 100644
--- a/src/solution/s0131_palindrome_partitioning.rs
+++ b/src/solution/s0131_palindrome_partitioning.rs
@@ -19,6 +19,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/palindrome-partitioning/
+// discuss: https://leetcode.com/problems/palindrome-partitioning/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0132_palindrome_partitioning_ii.rs b/src/solution/s0132_palindrome_partitioning_ii.rs
index 99dc13f0..81b75cf6 100644
--- a/src/solution/s0132_palindrome_partitioning_ii.rs
+++ b/src/solution/s0132_palindrome_partitioning_ii.rs
@@ -16,6 +16,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/palindrome-partitioning-ii/
+// discuss: https://leetcode.com/problems/palindrome-partitioning-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0134_gas_station.rs b/src/solution/s0134_gas_station.rs
index 69462797..352990f9 100644
--- a/src/solution/s0134_gas_station.rs
+++ b/src/solution/s0134_gas_station.rs
@@ -55,6 +55,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/gas-station/
+// discuss: https://leetcode.com/problems/gas-station/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0135_candy.rs b/src/solution/s0135_candy.rs
index 39e3de36..debb29d0 100644
--- a/src/solution/s0135_candy.rs
+++ b/src/solution/s0135_candy.rs
@@ -32,6 +32,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/candy/
+// discuss: https://leetcode.com/problems/candy/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0136_single_number.rs b/src/solution/s0136_single_number.rs
index 5d14631b..580d1213 100644
--- a/src/solution/s0136_single_number.rs
+++ b/src/solution/s0136_single_number.rs
@@ -24,6 +24,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/single-number/
+// discuss: https://leetcode.com/problems/single-number/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 impl Solution {
     pub fn single_number(nums: Vec<i32>) -> i32 {
diff --git a/src/solution/s0137_single_number_ii.rs b/src/solution/s0137_single_number_ii.rs
index e4a928a2..5e99cd84 100644
--- a/src/solution/s0137_single_number_ii.rs
+++ b/src/solution/s0137_single_number_ii.rs
@@ -23,6 +23,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/single-number-ii/
+// discuss: https://leetcode.com/problems/single-number-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0139_word_break.rs b/src/solution/s0139_word_break.rs
index ed4af30c..ce9e2684 100644
--- a/src/solution/s0139_word_break.rs
+++ b/src/solution/s0139_word_break.rs
@@ -48,6 +48,9 @@ DP 向上递推即可
 BFS 也是可以的
 */
 
+// problem: https://leetcode.com/problems/word-break/
+// discuss: https://leetcode.com/problems/word-break/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::collections::HashSet;
diff --git a/src/solution/s0140_word_break_ii.rs b/src/solution/s0140_word_break_ii.rs
index 9953e574..68c1319e 100644
--- a/src/solution/s0140_word_break_ii.rs
+++ b/src/solution/s0140_word_break_ii.rs
@@ -50,6 +50,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/word-break-ii/
+// discuss: https://leetcode.com/problems/word-break-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0143_reorder_list.rs b/src/solution/s0143_reorder_list.rs
index 06ec32af..1a7854cc 100644
--- a/src/solution/s0143_reorder_list.rs
+++ b/src/solution/s0143_reorder_list.rs
@@ -21,6 +21,9 @@
 pub struct Solution {}
 use crate::util::linked_list::{to_list, ListNode};
 
+// problem: https://leetcode.com/problems/reorder-list/
+// discuss: https://leetcode.com/problems/reorder-list/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0144_binary_tree_preorder_traversal.rs b/src/solution/s0144_binary_tree_preorder_traversal.rs
index 02ed1f7a..3d823976 100644
--- a/src/solution/s0144_binary_tree_preorder_traversal.rs
+++ b/src/solution/s0144_binary_tree_preorder_traversal.rs
@@ -22,6 +22,9 @@
 pub struct Solution {}
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/binary-tree-preorder-traversal/
+// discuss: https://leetcode.com/problems/binary-tree-preorder-traversal/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cell::RefCell;
diff --git a/src/solution/s0145_binary_tree_postorder_traversal.rs b/src/solution/s0145_binary_tree_postorder_traversal.rs
index 2670b5bd..63197e88 100644
--- a/src/solution/s0145_binary_tree_postorder_traversal.rs
+++ b/src/solution/s0145_binary_tree_postorder_traversal.rs
@@ -22,6 +22,9 @@
 pub struct Solution {}
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/binary-tree-postorder-traversal/
+// discuss: https://leetcode.com/problems/binary-tree-postorder-traversal/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cell::RefCell;
diff --git a/src/solution/s0146_lru_cache.rs b/src/solution/s0146_lru_cache.rs
index 5ee256c8..226cbf77 100644
--- a/src/solution/s0146_lru_cache.rs
+++ b/src/solution/s0146_lru_cache.rs
@@ -29,6 +29,9 @@
  *
  *
  */
+// problem: https://leetcode.com/problems/lru-cache/
+// discuss: https://leetcode.com/problems/lru-cache/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0147_insertion_sort_list.rs b/src/solution/s0147_insertion_sort_list.rs
index cdcd2d69..09aff82b 100644
--- a/src/solution/s0147_insertion_sort_list.rs
+++ b/src/solution/s0147_insertion_sort_list.rs
@@ -41,6 +41,9 @@
 pub struct Solution {}
 use crate::util::linked_list::{to_list, ListNode};
 
+// problem: https://leetcode.com/problems/insertion-sort-list/
+// discuss: https://leetcode.com/problems/insertion-sort-list/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // TODO; boring
diff --git a/src/solution/s0148_sort_list.rs b/src/solution/s0148_sort_list.rs
index 4bc8ac17..78b7f08c 100644
--- a/src/solution/s0148_sort_list.rs
+++ b/src/solution/s0148_sort_list.rs
@@ -20,6 +20,9 @@
 pub struct Solution {}
 use crate::util::linked_list::{to_list, ListNode};
 
+// problem: https://leetcode.com/problems/sort-list/
+// discuss: https://leetcode.com/problems/sort-list/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0149_max_points_on_a_line.rs b/src/solution/s0149_max_points_on_a_line.rs
index 1b0bf16c..31ea4c62 100644
--- a/src/solution/s0149_max_points_on_a_line.rs
+++ b/src/solution/s0149_max_points_on_a_line.rs
@@ -38,6 +38,9 @@
 pub struct Solution {}
 use crate::util::point::Point;
 
+// problem: https://leetcode.com/problems/max-points-on-a-line/
+// discuss: https://leetcode.com/problems/max-points-on-a-line/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0150_evaluate_reverse_polish_notation.rs b/src/solution/s0150_evaluate_reverse_polish_notation.rs
index 4626d5aa..048824dd 100644
--- a/src/solution/s0150_evaluate_reverse_polish_notation.rs
+++ b/src/solution/s0150_evaluate_reverse_polish_notation.rs
@@ -46,6 +46,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/evaluate-reverse-polish-notation/
+// discuss: https://leetcode.com/problems/evaluate-reverse-polish-notation/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0151_reverse_words_in_a_string.rs b/src/solution/s0151_reverse_words_in_a_string.rs
index e26bd573..627f0dd6 100644
--- a/src/solution/s0151_reverse_words_in_a_string.rs
+++ b/src/solution/s0151_reverse_words_in_a_string.rs
@@ -46,6 +46,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/reverse-words-in-a-string/
+// discuss: https://leetcode.com/problems/reverse-words-in-a-string/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0152_maximum_product_subarray.rs b/src/solution/s0152_maximum_product_subarray.rs
index 34bba87e..b85b5ecb 100644
--- a/src/solution/s0152_maximum_product_subarray.rs
+++ b/src/solution/s0152_maximum_product_subarray.rs
@@ -21,6 +21,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/maximum-product-subarray/
+// discuss: https://leetcode.com/problems/maximum-product-subarray/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0153_find_minimum_in_rotated_sorted_array.rs b/src/solution/s0153_find_minimum_in_rotated_sorted_array.rs
index 9c609f42..03b7e7f1 100644
--- a/src/solution/s0153_find_minimum_in_rotated_sorted_array.rs
+++ b/src/solution/s0153_find_minimum_in_rotated_sorted_array.rs
@@ -26,6 +26,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/find-minimum-in-rotated-sorted-array/
+// discuss: https://leetcode.com/problems/find-minimum-in-rotated-sorted-array/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0154_find_minimum_in_rotated_sorted_array_ii.rs b/src/solution/s0154_find_minimum_in_rotated_sorted_array_ii.rs
index 8868ff82..cdb23ac3 100644
--- a/src/solution/s0154_find_minimum_in_rotated_sorted_array_ii.rs
+++ b/src/solution/s0154_find_minimum_in_rotated_sorted_array_ii.rs
@@ -31,6 +31,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/find-minimum-in-rotated-sorted-array-ii/
+// discuss: https://leetcode.com/problems/find-minimum-in-rotated-sorted-array-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0155_min_stack.rs b/src/solution/s0155_min_stack.rs
index 1c544d87..99a96698 100644
--- a/src/solution/s0155_min_stack.rs
+++ b/src/solution/s0155_min_stack.rs
@@ -34,6 +34,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/min-stack/
+// discuss: https://leetcode.com/problems/min-stack/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0162_find_peak_element.rs b/src/solution/s0162_find_peak_element.rs
index 8e5a3f76..3888b998 100644
--- a/src/solution/s0162_find_peak_element.rs
+++ b/src/solution/s0162_find_peak_element.rs
@@ -32,6 +32,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/find-peak-element/
+// discuss: https://leetcode.com/problems/find-peak-element/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0164_maximum_gap.rs b/src/solution/s0164_maximum_gap.rs
index ded5006d..bd961db7 100644
--- a/src/solution/s0164_maximum_gap.rs
+++ b/src/solution/s0164_maximum_gap.rs
@@ -30,6 +30,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/maximum-gap/
+// discuss: https://leetcode.com/problems/maximum-gap/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 /*
 想不出来, 一看解析居然是 Radix Sort 或 Bucket Sort, 我就 ??? 了...
diff --git a/src/solution/s0165_compare_version_numbers.rs b/src/solution/s0165_compare_version_numbers.rs
index 522224df..b53f1bbb 100644
--- a/src/solution/s0165_compare_version_numbers.rs
+++ b/src/solution/s0165_compare_version_numbers.rs
@@ -48,6 +48,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/compare-version-numbers/
+// discuss: https://leetcode.com/problems/compare-version-numbers/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0166_fraction_to_recurring_decimal.rs b/src/solution/s0166_fraction_to_recurring_decimal.rs
index 29900b38..4585738f 100644
--- a/src/solution/s0166_fraction_to_recurring_decimal.rs
+++ b/src/solution/s0166_fraction_to_recurring_decimal.rs
@@ -28,6 +28,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/fraction-to-recurring-decimal/
+// discuss: https://leetcode.com/problems/fraction-to-recurring-decimal/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // TODO
diff --git a/src/solution/s0167_two_sum_ii_input_array_is_sorted.rs b/src/solution/s0167_two_sum_ii_input_array_is_sorted.rs
index 9fd7a483..58de2e86 100644
--- a/src/solution/s0167_two_sum_ii_input_array_is_sorted.rs
+++ b/src/solution/s0167_two_sum_ii_input_array_is_sorted.rs
@@ -22,6 +22,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/
+// discuss: https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0168_excel_sheet_column_title.rs b/src/solution/s0168_excel_sheet_column_title.rs
index c61f9875..5a9dc585 100644
--- a/src/solution/s0168_excel_sheet_column_title.rs
+++ b/src/solution/s0168_excel_sheet_column_title.rs
@@ -39,6 +39,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/excel-sheet-column-title/
+// discuss: https://leetcode.com/problems/excel-sheet-column-title/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0169_majority_element.rs b/src/solution/s0169_majority_element.rs
index ccde478f..be59bea6 100644
--- a/src/solution/s0169_majority_element.rs
+++ b/src/solution/s0169_majority_element.rs
@@ -21,6 +21,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/majority-element/
+// discuss: https://leetcode.com/problems/majority-element/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0171_excel_sheet_column_number.rs b/src/solution/s0171_excel_sheet_column_number.rs
index a6e6838c..1b2f611f 100644
--- a/src/solution/s0171_excel_sheet_column_number.rs
+++ b/src/solution/s0171_excel_sheet_column_number.rs
@@ -39,6 +39,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/excel-sheet-column-number/
+// discuss: https://leetcode.com/problems/excel-sheet-column-number/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // TODO: boring
diff --git a/src/solution/s0172_factorial_trailing_zeroes.rs b/src/solution/s0172_factorial_trailing_zeroes.rs
index 0c9f9691..9a54916d 100644
--- a/src/solution/s0172_factorial_trailing_zeroes.rs
+++ b/src/solution/s0172_factorial_trailing_zeroes.rs
@@ -22,6 +22,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/factorial-trailing-zeroes/
+// discuss: https://leetcode.com/problems/factorial-trailing-zeroes/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0173_binary_search_tree_iterator.rs b/src/solution/s0173_binary_search_tree_iterator.rs
index caef4724..b350600d 100644
--- a/src/solution/s0173_binary_search_tree_iterator.rs
+++ b/src/solution/s0173_binary_search_tree_iterator.rs
@@ -42,6 +42,9 @@ use crate::util::tree::{to_tree, TreeNode};
 use std::cell::RefCell;
 use std::rc::Rc;
 
+// problem: https://leetcode.com/problems/binary-search-tree-iterator/
+// discuss: https://leetcode.com/problems/binary-search-tree-iterator/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0174_dungeon_game.rs b/src/solution/s0174_dungeon_game.rs
index c1551250..23be4d97 100644
--- a/src/solution/s0174_dungeon_game.rs
+++ b/src/solution/s0174_dungeon_game.rs
@@ -57,6 +57,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/dungeon-game/
+// discuss: https://leetcode.com/problems/dungeon-game/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0179_largest_number.rs b/src/solution/s0179_largest_number.rs
index 349ffc8b..65348165 100644
--- a/src/solution/s0179_largest_number.rs
+++ b/src/solution/s0179_largest_number.rs
@@ -21,6 +21,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/largest-number/
+// discuss: https://leetcode.com/problems/largest-number/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0187_repeated_dna_sequences.rs b/src/solution/s0187_repeated_dna_sequences.rs
index d16cf948..9ceb86cb 100644
--- a/src/solution/s0187_repeated_dna_sequences.rs
+++ b/src/solution/s0187_repeated_dna_sequences.rs
@@ -16,6 +16,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/repeated-dna-sequences/
+// discuss: https://leetcode.com/problems/repeated-dna-sequences/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0188_best_time_to_buy_and_sell_stock_iv.rs b/src/solution/s0188_best_time_to_buy_and_sell_stock_iv.rs
index af1d9c09..e9c23319 100644
--- a/src/solution/s0188_best_time_to_buy_and_sell_stock_iv.rs
+++ b/src/solution/s0188_best_time_to_buy_and_sell_stock_iv.rs
@@ -27,6 +27,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/best-time-to-buy-and-sell-stock-iv/
+// discuss: https://leetcode.com/problems/best-time-to-buy-and-sell-stock-iv/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0189_rotate_array.rs b/src/solution/s0189_rotate_array.rs
index 644ce374..1a4d2ab8 100644
--- a/src/solution/s0189_rotate_array.rs
+++ b/src/solution/s0189_rotate_array.rs
@@ -33,6 +33,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/rotate-array/
+// discuss: https://leetcode.com/problems/rotate-array/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0198_house_robber.rs b/src/solution/s0198_house_robber.rs
index e1257f0c..446e63f1 100644
--- a/src/solution/s0198_house_robber.rs
+++ b/src/solution/s0198_house_robber.rs
@@ -25,6 +25,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/house-robber/
+// discuss: https://leetcode.com/problems/house-robber/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0199_binary_tree_right_side_view.rs b/src/solution/s0199_binary_tree_right_side_view.rs
index c580970c..e07dc998 100644
--- a/src/solution/s0199_binary_tree_right_side_view.rs
+++ b/src/solution/s0199_binary_tree_right_side_view.rs
@@ -20,6 +20,9 @@
 pub struct Solution {}
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/binary-tree-right-side-view/
+// discuss: https://leetcode.com/problems/binary-tree-right-side-view/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cell::RefCell;
diff --git a/src/solution/s0200_number_of_islands.rs b/src/solution/s0200_number_of_islands.rs
index b9bcadd2..262f0315 100644
--- a/src/solution/s0200_number_of_islands.rs
+++ b/src/solution/s0200_number_of_islands.rs
@@ -29,6 +29,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/number-of-islands/
+// discuss: https://leetcode.com/problems/number-of-islands/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // Union-Find Set
diff --git a/src/solution/s0201_bitwise_and_of_numbers_range.rs b/src/solution/s0201_bitwise_and_of_numbers_range.rs
index 6fc338b7..6c46e74f 100644
--- a/src/solution/s0201_bitwise_and_of_numbers_range.rs
+++ b/src/solution/s0201_bitwise_and_of_numbers_range.rs
@@ -18,6 +18,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/bitwise-and-of-numbers-range/
+// discuss: https://leetcode.com/problems/bitwise-and-of-numbers-range/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // just find the highest bit 1 of m and n
diff --git a/src/solution/s0202_happy_number.rs b/src/solution/s0202_happy_number.rs
index 3443f1db..076f2736 100644
--- a/src/solution/s0202_happy_number.rs
+++ b/src/solution/s0202_happy_number.rs
@@ -19,6 +19,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/happy-number/
+// discuss: https://leetcode.com/problems/happy-number/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::collections::HashSet;
diff --git a/src/solution/s0203_remove_linked_list_elements.rs b/src/solution/s0203_remove_linked_list_elements.rs
index f8d9bc43..3e48d811 100644
--- a/src/solution/s0203_remove_linked_list_elements.rs
+++ b/src/solution/s0203_remove_linked_list_elements.rs
@@ -14,6 +14,9 @@
 pub struct Solution {}
 use crate::util::linked_list::{to_list, ListNode};
 
+// problem: https://leetcode.com/problems/remove-linked-list-elements/
+// discuss: https://leetcode.com/problems/remove-linked-list-elements/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0204_count_primes.rs b/src/solution/s0204_count_primes.rs
index 4ec5d5c3..d6f0f134 100644
--- a/src/solution/s0204_count_primes.rs
+++ b/src/solution/s0204_count_primes.rs
@@ -14,6 +14,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/count-primes/
+// discuss: https://leetcode.com/problems/count-primes/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0205_isomorphic_strings.rs b/src/solution/s0205_isomorphic_strings.rs
index 6bb77373..df697ebb 100644
--- a/src/solution/s0205_isomorphic_strings.rs
+++ b/src/solution/s0205_isomorphic_strings.rs
@@ -32,6 +32,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/isomorphic-strings/
+// discuss: https://leetcode.com/problems/isomorphic-strings/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::char;
diff --git a/src/solution/s0206_reverse_linked_list.rs b/src/solution/s0206_reverse_linked_list.rs
index 4689f415..b62aced8 100644
--- a/src/solution/s0206_reverse_linked_list.rs
+++ b/src/solution/s0206_reverse_linked_list.rs
@@ -18,6 +18,9 @@
 pub struct Solution {}
 use crate::util::linked_list::{to_list, ListNode};
 
+// problem: https://leetcode.com/problems/reverse-linked-list/
+// discuss: https://leetcode.com/problems/reverse-linked-list/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0207_course_schedule.rs b/src/solution/s0207_course_schedule.rs
index 2222adad..2a793683 100644
--- a/src/solution/s0207_course_schedule.rs
+++ b/src/solution/s0207_course_schedule.rs
@@ -35,6 +35,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/course-schedule/
+// discuss: https://leetcode.com/problems/course-schedule/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // topology sort, BFS
diff --git a/src/solution/s0208_implement_trie_prefix_tree.rs b/src/solution/s0208_implement_trie_prefix_tree.rs
index be29d61b..9ac8e470 100644
--- a/src/solution/s0208_implement_trie_prefix_tree.rs
+++ b/src/solution/s0208_implement_trie_prefix_tree.rs
@@ -26,6 +26,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/implement-trie-prefix-tree/
+// discuss: https://leetcode.com/problems/implement-trie-prefix-tree/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 #[derive(Default)]
diff --git a/src/solution/s0209_minimum_size_subarray_sum.rs b/src/solution/s0209_minimum_size_subarray_sum.rs
index 13b02448..b6a692d7 100644
--- a/src/solution/s0209_minimum_size_subarray_sum.rs
+++ b/src/solution/s0209_minimum_size_subarray_sum.rs
@@ -17,6 +17,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/minimum-size-subarray-sum/
+// discuss: https://leetcode.com/problems/minimum-size-subarray-sum/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0210_course_schedule_ii.rs b/src/solution/s0210_course_schedule_ii.rs
index 336fe345..dd3a1b03 100644
--- a/src/solution/s0210_course_schedule_ii.rs
+++ b/src/solution/s0210_course_schedule_ii.rs
@@ -36,6 +36,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/course-schedule-ii/
+// discuss: https://leetcode.com/problems/course-schedule-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::collections::VecDeque;
diff --git a/src/solution/s0211_add_and_search_word_data_structure_design.rs b/src/solution/s0211_add_and_search_word_data_structure_design.rs
index fbab7949..0652f951 100644
--- a/src/solution/s0211_add_and_search_word_data_structure_design.rs
+++ b/src/solution/s0211_add_and_search_word_data_structure_design.rs
@@ -28,6 +28,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/add-and-search-word-data-structure-design/
+// discuss: https://leetcode.com/problems/add-and-search-word-data-structure-design/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 struct WordDictionary {
diff --git a/src/solution/s0212_word_search_ii.rs b/src/solution/s0212_word_search_ii.rs
index 77914f04..ada034c8 100644
--- a/src/solution/s0212_word_search_ii.rs
+++ b/src/solution/s0212_word_search_ii.rs
@@ -34,6 +34,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/word-search-ii/
+// discuss: https://leetcode.com/problems/word-search-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 // TODO
 
diff --git a/src/solution/s0213_house_robber_ii.rs b/src/solution/s0213_house_robber_ii.rs
index 6dac950c..fbe55040 100644
--- a/src/solution/s0213_house_robber_ii.rs
+++ b/src/solution/s0213_house_robber_ii.rs
@@ -25,6 +25,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/house-robber-ii/
+// discuss: https://leetcode.com/problems/house-robber-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // DP twice: rob first one || not rob first one
diff --git a/src/solution/s0214_shortest_palindrome.rs b/src/solution/s0214_shortest_palindrome.rs
index a8a23c60..425eec95 100644
--- a/src/solution/s0214_shortest_palindrome.rs
+++ b/src/solution/s0214_shortest_palindrome.rs
@@ -18,6 +18,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/shortest-palindrome/
+// discuss: https://leetcode.com/problems/shortest-palindrome/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0215_kth_largest_element_in_an_array.rs b/src/solution/s0215_kth_largest_element_in_an_array.rs
index 3c114990..159e7af6 100644
--- a/src/solution/s0215_kth_largest_element_in_an_array.rs
+++ b/src/solution/s0215_kth_largest_element_in_an_array.rs
@@ -22,6 +22,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/kth-largest-element-in-an-array/
+// discuss: https://leetcode.com/problems/kth-largest-element-in-an-array/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cmp::Reverse;
diff --git a/src/solution/s0216_combination_sum_iii.rs b/src/solution/s0216_combination_sum_iii.rs
index d6f797fa..0f714e01 100644
--- a/src/solution/s0216_combination_sum_iii.rs
+++ b/src/solution/s0216_combination_sum_iii.rs
@@ -28,6 +28,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/combination-sum-iii/
+// discuss: https://leetcode.com/problems/combination-sum-iii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0217_contains_duplicate.rs b/src/solution/s0217_contains_duplicate.rs
index 6e2c906d..0d2e5e12 100644
--- a/src/solution/s0217_contains_duplicate.rs
+++ b/src/solution/s0217_contains_duplicate.rs
@@ -26,6 +26,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/contains-duplicate/
+// discuss: https://leetcode.com/problems/contains-duplicate/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0218_the_skyline_problem.rs b/src/solution/s0218_the_skyline_problem.rs
index 9e774db0..7f0ba3c1 100644
--- a/src/solution/s0218_the_skyline_problem.rs
+++ b/src/solution/s0218_the_skyline_problem.rs
@@ -24,6 +24,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/the-skyline-problem/
+// discuss: https://leetcode.com/problems/the-skyline-problem/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0219_contains_duplicate_ii.rs b/src/solution/s0219_contains_duplicate_ii.rs
index c5713adb..da446dae 100644
--- a/src/solution/s0219_contains_duplicate_ii.rs
+++ b/src/solution/s0219_contains_duplicate_ii.rs
@@ -33,6 +33,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/contains-duplicate-ii/
+// discuss: https://leetcode.com/problems/contains-duplicate-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::collections::HashMap;
diff --git a/src/solution/s0220_contains_duplicate_iii.rs b/src/solution/s0220_contains_duplicate_iii.rs
index a29cb2e5..0677b1d3 100644
--- a/src/solution/s0220_contains_duplicate_iii.rs
+++ b/src/solution/s0220_contains_duplicate_iii.rs
@@ -33,6 +33,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/contains-duplicate-iii/
+// discuss: https://leetcode.com/problems/contains-duplicate-iii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 use std::collections::HashMap;
 impl Solution {
diff --git a/src/solution/s0221_maximal_square.rs b/src/solution/s0221_maximal_square.rs
index 2fbe5b02..34f793ac 100644
--- a/src/solution/s0221_maximal_square.rs
+++ b/src/solution/s0221_maximal_square.rs
@@ -18,6 +18,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/maximal-square/
+// discuss: https://leetcode.com/problems/maximal-square/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0222_count_complete_tree_nodes.rs b/src/solution/s0222_count_complete_tree_nodes.rs
index 189fb3dd..ae0d410b 100644
--- a/src/solution/s0222_count_complete_tree_nodes.rs
+++ b/src/solution/s0222_count_complete_tree_nodes.rs
@@ -24,6 +24,9 @@
 pub struct Solution {}
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/count-complete-tree-nodes/
+// discuss: https://leetcode.com/problems/count-complete-tree-nodes/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cell::RefCell;
diff --git a/src/solution/s0223_rectangle_area.rs b/src/solution/s0223_rectangle_area.rs
index b90235dd..647b6b2a 100644
--- a/src/solution/s0223_rectangle_area.rs
+++ b/src/solution/s0223_rectangle_area.rs
@@ -20,6 +20,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/rectangle-area/
+// discuss: https://leetcode.com/problems/rectangle-area/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // mention the integer divition
diff --git a/src/solution/s0224_basic_calculator.rs b/src/solution/s0224_basic_calculator.rs
index 33ed3112..5d917661 100644
--- a/src/solution/s0224_basic_calculator.rs
+++ b/src/solution/s0224_basic_calculator.rs
@@ -33,6 +33,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/basic-calculator/
+// discuss: https://leetcode.com/problems/basic-calculator/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 #[derive(PartialEq, Copy, Clone, Debug)]
diff --git a/src/solution/s0225_implement_stack_using_queues.rs b/src/solution/s0225_implement_stack_using_queues.rs
index a4ff6a3b..f162e9a6 100644
--- a/src/solution/s0225_implement_stack_using_queues.rs
+++ b/src/solution/s0225_implement_stack_using_queues.rs
@@ -32,6 +32,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/implement-stack-using-queues/
+// discuss: https://leetcode.com/problems/implement-stack-using-queues/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 struct MyStack {
diff --git a/src/solution/s0226_invert_binary_tree.rs b/src/solution/s0226_invert_binary_tree.rs
index 30bd001a..1a1b6115 100644
--- a/src/solution/s0226_invert_binary_tree.rs
+++ b/src/solution/s0226_invert_binary_tree.rs
@@ -32,6 +32,9 @@
 pub struct Solution {}
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/invert-binary-tree/
+// discuss: https://leetcode.com/problems/invert-binary-tree/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cell::RefCell;
diff --git a/src/solution/s0227_basic_calculator_ii.rs b/src/solution/s0227_basic_calculator_ii.rs
index cd52accb..07e349dd 100644
--- a/src/solution/s0227_basic_calculator_ii.rs
+++ b/src/solution/s0227_basic_calculator_ii.rs
@@ -35,6 +35,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/basic-calculator-ii/
+// discuss: https://leetcode.com/problems/basic-calculator-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0228_summary_ranges.rs b/src/solution/s0228_summary_ranges.rs
index bb36db17..63e8fe77 100644
--- a/src/solution/s0228_summary_ranges.rs
+++ b/src/solution/s0228_summary_ranges.rs
@@ -22,6 +22,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/summary-ranges/
+// discuss: https://leetcode.com/problems/summary-ranges/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0229_majority_element_ii.rs b/src/solution/s0229_majority_element_ii.rs
index 26baf79e..fab987ba 100644
--- a/src/solution/s0229_majority_element_ii.rs
+++ b/src/solution/s0229_majority_element_ii.rs
@@ -20,6 +20,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/majority-element-ii/
+// discuss: https://leetcode.com/problems/majority-element-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0230_kth_smallest_element_in_a_bst.rs b/src/solution/s0230_kth_smallest_element_in_a_bst.rs
index fe14721f..0533f705 100644
--- a/src/solution/s0230_kth_smallest_element_in_a_bst.rs
+++ b/src/solution/s0230_kth_smallest_element_in_a_bst.rs
@@ -38,6 +38,9 @@
 pub struct Solution {}
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/kth-smallest-element-in-a-bst/
+// discuss: https://leetcode.com/problems/kth-smallest-element-in-a-bst/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cell::RefCell;
diff --git a/src/solution/s0231_power_of_two.rs b/src/solution/s0231_power_of_two.rs
index 683dfc91..334fc314 100644
--- a/src/solution/s0231_power_of_two.rs
+++ b/src/solution/s0231_power_of_two.rs
@@ -27,6 +27,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/power-of-two/
+// discuss: https://leetcode.com/problems/power-of-two/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0232_implement_queue_using_stacks.rs b/src/solution/s0232_implement_queue_using_stacks.rs
index d7ff9543..70bf3735 100644
--- a/src/solution/s0232_implement_queue_using_stacks.rs
+++ b/src/solution/s0232_implement_queue_using_stacks.rs
@@ -32,6 +32,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/implement-queue-using-stacks/
+// discuss: https://leetcode.com/problems/implement-queue-using-stacks/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 struct MyQueue {
diff --git a/src/solution/s0233_number_of_digit_one.rs b/src/solution/s0233_number_of_digit_one.rs
index 74c0091c..60097ed0 100644
--- a/src/solution/s0233_number_of_digit_one.rs
+++ b/src/solution/s0233_number_of_digit_one.rs
@@ -14,6 +14,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/number-of-digit-one/
+// discuss: https://leetcode.com/problems/number-of-digit-one/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0238_product_of_array_except_self.rs b/src/solution/s0238_product_of_array_except_self.rs
index 7134f2ba..ef5683c4 100644
--- a/src/solution/s0238_product_of_array_except_self.rs
+++ b/src/solution/s0238_product_of_array_except_self.rs
@@ -18,6 +18,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/product-of-array-except-self/
+// discuss: https://leetcode.com/problems/product-of-array-except-self/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0239_sliding_window_maximum.rs b/src/solution/s0239_sliding_window_maximum.rs
index 116218f6..f7509cb9 100644
--- a/src/solution/s0239_sliding_window_maximum.rs
+++ b/src/solution/s0239_sliding_window_maximum.rs
@@ -28,6 +28,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/sliding-window-maximum/
+// discuss: https://leetcode.com/problems/sliding-window-maximum/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::collections::VecDeque;
diff --git a/src/solution/s0241_different_ways_to_add_parentheses.rs b/src/solution/s0241_different_ways_to_add_parentheses.rs
index cdb5ceaa..a76bfa6a 100644
--- a/src/solution/s0241_different_ways_to_add_parentheses.rs
+++ b/src/solution/s0241_different_ways_to_add_parentheses.rs
@@ -27,6 +27,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/different-ways-to-add-parentheses/
+// discuss: https://leetcode.com/problems/different-ways-to-add-parentheses/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0242_valid_anagram.rs b/src/solution/s0242_valid_anagram.rs
index 8c809549..ba7a58ae 100644
--- a/src/solution/s0242_valid_anagram.rs
+++ b/src/solution/s0242_valid_anagram.rs
@@ -26,6 +26,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/valid-anagram/
+// discuss: https://leetcode.com/problems/valid-anagram/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0257_binary_tree_paths.rs b/src/solution/s0257_binary_tree_paths.rs
index c5d6d336..6c7833e2 100644
--- a/src/solution/s0257_binary_tree_paths.rs
+++ b/src/solution/s0257_binary_tree_paths.rs
@@ -24,6 +24,9 @@
 pub struct Solution {}
 use crate::util::tree::{to_tree, TreeNode};
 
+// problem: https://leetcode.com/problems/binary-tree-paths/
+// discuss: https://leetcode.com/problems/binary-tree-paths/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // Definition for a binary tree node.
diff --git a/src/solution/s0258_add_digits.rs b/src/solution/s0258_add_digits.rs
index 1ebeda42..2248be1d 100644
--- a/src/solution/s0258_add_digits.rs
+++ b/src/solution/s0258_add_digits.rs
@@ -17,6 +17,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/add-digits/
+// discuss: https://leetcode.com/problems/add-digits/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0260_single_number_iii.rs b/src/solution/s0260_single_number_iii.rs
index 2735cb7d..09d7a920 100644
--- a/src/solution/s0260_single_number_iii.rs
+++ b/src/solution/s0260_single_number_iii.rs
@@ -18,6 +18,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/single-number-iii/
+// discuss: https://leetcode.com/problems/single-number-iii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0263_ugly_number.rs b/src/solution/s0263_ugly_number.rs
index 1ad0a3cc..9ef3bf57 100644
--- a/src/solution/s0263_ugly_number.rs
+++ b/src/solution/s0263_ugly_number.rs
@@ -37,6 +37,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/ugly-number/
+// discuss: https://leetcode.com/problems/ugly-number/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0264_ugly_number_ii.rs b/src/solution/s0264_ugly_number_ii.rs
index 48be94d1..8dda4f01 100644
--- a/src/solution/s0264_ugly_number_ii.rs
+++ b/src/solution/s0264_ugly_number_ii.rs
@@ -21,6 +21,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/ugly-number-ii/
+// discuss: https://leetcode.com/problems/ugly-number-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0268_missing_number.rs b/src/solution/s0268_missing_number.rs
index c8636b99..63291ee0 100644
--- a/src/solution/s0268_missing_number.rs
+++ b/src/solution/s0268_missing_number.rs
@@ -22,6 +22,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/missing-number/
+// discuss: https://leetcode.com/problems/missing-number/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0273_integer_to_english_words.rs b/src/solution/s0273_integer_to_english_words.rs
index 7119014d..123a1f9d 100644
--- a/src/solution/s0273_integer_to_english_words.rs
+++ b/src/solution/s0273_integer_to_english_words.rs
@@ -33,6 +33,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/integer-to-english-words/
+// discuss: https://leetcode.com/problems/integer-to-english-words/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // static digits: Vec<&str> = vec!["One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine"];
diff --git a/src/solution/s0274_h_index.rs b/src/solution/s0274_h_index.rs
index 936ba1e7..b36f65a3 100644
--- a/src/solution/s0274_h_index.rs
+++ b/src/solution/s0274_h_index.rs
@@ -20,6 +20,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/h-index/
+// discuss: https://leetcode.com/problems/h-index/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0275_h_index_ii.rs b/src/solution/s0275_h_index_ii.rs
index 63e21671..027ad02a 100644
--- a/src/solution/s0275_h_index_ii.rs
+++ b/src/solution/s0275_h_index_ii.rs
@@ -29,6 +29,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/h-index-ii/
+// discuss: https://leetcode.com/problems/h-index-ii/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0279_perfect_squares.rs b/src/solution/s0279_perfect_squares.rs
index 349d9584..fe5f0a01 100644
--- a/src/solution/s0279_perfect_squares.rs
+++ b/src/solution/s0279_perfect_squares.rs
@@ -19,6 +19,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/perfect-squares/
+// discuss: https://leetcode.com/problems/perfect-squares/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // BFS
diff --git a/src/solution/s0282_expression_add_operators.rs b/src/solution/s0282_expression_add_operators.rs
index a1c9d776..1c41367b 100644
--- a/src/solution/s0282_expression_add_operators.rs
+++ b/src/solution/s0282_expression_add_operators.rs
@@ -39,6 +39,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/expression-add-operators/
+// discuss: https://leetcode.com/problems/expression-add-operators/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0283_move_zeroes.rs b/src/solution/s0283_move_zeroes.rs
index 1087acab..6581bcaf 100644
--- a/src/solution/s0283_move_zeroes.rs
+++ b/src/solution/s0283_move_zeroes.rs
@@ -18,6 +18,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/move-zeroes/
+// discuss: https://leetcode.com/problems/move-zeroes/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0287_find_the_duplicate_number.rs b/src/solution/s0287_find_the_duplicate_number.rs
index d0111840..cea65001 100644
--- a/src/solution/s0287_find_the_duplicate_number.rs
+++ b/src/solution/s0287_find_the_duplicate_number.rs
@@ -28,6 +28,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/find-the-duplicate-number/
+// discuss: https://leetcode.com/problems/find-the-duplicate-number/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // 假如把值看做 next node 的下标, 那么:
diff --git a/src/solution/s0289_game_of_life.rs b/src/solution/s0289_game_of_life.rs
index 37e81fc3..53d34623 100644
--- a/src/solution/s0289_game_of_life.rs
+++ b/src/solution/s0289_game_of_life.rs
@@ -43,6 +43,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/game-of-life/
+// discuss: https://leetcode.com/problems/game-of-life/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // in-place: 1: live->live, 0: die->die, 2: die->live, 3: live->die
diff --git a/src/solution/s0290_word_pattern.rs b/src/solution/s0290_word_pattern.rs
index adb5cb0e..c758f352 100644
--- a/src/solution/s0290_word_pattern.rs
+++ b/src/solution/s0290_word_pattern.rs
@@ -35,6 +35,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/word-pattern/
+// discuss: https://leetcode.com/problems/word-pattern/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::collections::HashMap;
diff --git a/src/solution/s0292_nim_game.rs b/src/solution/s0292_nim_game.rs
index ff0e1444..4c46505c 100644
--- a/src/solution/s0292_nim_game.rs
+++ b/src/solution/s0292_nim_game.rs
@@ -16,6 +16,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/nim-game/
+// discuss: https://leetcode.com/problems/nim-game/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0295_find_median_from_data_stream.rs b/src/solution/s0295_find_median_from_data_stream.rs
index f400c5b0..02dc5331 100644
--- a/src/solution/s0295_find_median_from_data_stream.rs
+++ b/src/solution/s0295_find_median_from_data_stream.rs
@@ -39,6 +39,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/find-median-from-data-stream/
+// discuss: https://leetcode.com/problems/find-median-from-data-stream/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cmp::Ordering;
diff --git a/src/solution/s0299_bulls_and_cows.rs b/src/solution/s0299_bulls_and_cows.rs
index 3ef77009..08525c71 100644
--- a/src/solution/s0299_bulls_and_cows.rs
+++ b/src/solution/s0299_bulls_and_cows.rs
@@ -29,6 +29,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/bulls-and-cows/
+// discuss: https://leetcode.com/problems/bulls-and-cows/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0300_longest_increasing_subsequence.rs b/src/solution/s0300_longest_increasing_subsequence.rs
index cf5eee05..c0b7eb27 100644
--- a/src/solution/s0300_longest_increasing_subsequence.rs
+++ b/src/solution/s0300_longest_increasing_subsequence.rs
@@ -22,6 +22,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/longest-increasing-subsequence/
+// discuss: https://leetcode.com/problems/longest-increasing-subsequence/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 // N^2, DP: L[i] = max(1 + L[j]) for j in [0, i) and nums[j] < nums[i]
 // N * logN, kick out strategy, maintain an increasing array, new elements kick out a formal one larger than it, if the new element is largest, expand the array
diff --git a/src/solution/s0301_remove_invalid_parentheses.rs b/src/solution/s0301_remove_invalid_parentheses.rs
index 6d6f2f51..2cec757c 100644
--- a/src/solution/s0301_remove_invalid_parentheses.rs
+++ b/src/solution/s0301_remove_invalid_parentheses.rs
@@ -28,6 +28,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/remove-invalid-parentheses/
+// discuss: https://leetcode.com/problems/remove-invalid-parentheses/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // 1. Calculate the number of misplaced left parenthese and right parenthese
diff --git a/src/solution/s0303_range_sum_query_immutable.rs b/src/solution/s0303_range_sum_query_immutable.rs
index 0143a4ab..c56f8ae9 100644
--- a/src/solution/s0303_range_sum_query_immutable.rs
+++ b/src/solution/s0303_range_sum_query_immutable.rs
@@ -22,6 +22,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/range-sum-query-immutable/
+// discuss: https://leetcode.com/problems/range-sum-query-immutable/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 struct NumArray {
diff --git a/src/solution/s0304_range_sum_query_2d_immutable.rs b/src/solution/s0304_range_sum_query_2d_immutable.rs
index d9775add..42a0f41f 100644
--- a/src/solution/s0304_range_sum_query_2d_immutable.rs
+++ b/src/solution/s0304_range_sum_query_2d_immutable.rs
@@ -34,6 +34,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/range-sum-query-2d-immutable/
+// discuss: https://leetcode.com/problems/range-sum-query-2d-immutable/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 struct NumMatrix {
diff --git a/src/solution/s0306_additive_number.rs b/src/solution/s0306_additive_number.rs
index 08b926f4..38f6c0b2 100644
--- a/src/solution/s0306_additive_number.rs
+++ b/src/solution/s0306_additive_number.rs
@@ -31,6 +31,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/additive-number/
+// discuss: https://leetcode.com/problems/additive-number/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 // first_cut second_cut  third_cut
diff --git a/src/solution/s0307_range_sum_query_mutable.rs b/src/solution/s0307_range_sum_query_mutable.rs
index 74ec6139..bbaac119 100644
--- a/src/solution/s0307_range_sum_query_mutable.rs
+++ b/src/solution/s0307_range_sum_query_mutable.rs
@@ -36,6 +36,9 @@ pub struct Solution {}
 //    /    \        /    \     /     \
 //   N[0]  N[1]   N[2]  N[3]  N[4]  N[5]
 //
+// problem: https://leetcode.com/problems/range-sum-query-mutable/
+// discuss: https://leetcode.com/problems/range-sum-query-mutable/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 struct NumArray {
diff --git a/src/solution/s0309_best_time_to_buy_and_sell_stock_with_cooldown.rs b/src/solution/s0309_best_time_to_buy_and_sell_stock_with_cooldown.rs
index 0f3f2765..6f3e911d 100644
--- a/src/solution/s0309_best_time_to_buy_and_sell_stock_with_cooldown.rs
+++ b/src/solution/s0309_best_time_to_buy_and_sell_stock_with_cooldown.rs
@@ -20,6 +20,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/best-time-to-buy-and-sell-stock-with-cooldown/
+// discuss: https://leetcode.com/problems/best-time-to-buy-and-sell-stock-with-cooldown/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0310_minimum_height_trees.rs b/src/solution/s0310_minimum_height_trees.rs
index ab1337e2..4141273c 100644
--- a/src/solution/s0310_minimum_height_trees.rs
+++ b/src/solution/s0310_minimum_height_trees.rs
@@ -47,6 +47,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/minimum-height-trees/
+// discuss: https://leetcode.com/problems/minimum-height-trees/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::mem;
diff --git a/src/solution/s0312_burst_balloons.rs b/src/solution/s0312_burst_balloons.rs
index 689db341..f8833b5e 100644
--- a/src/solution/s0312_burst_balloons.rs
+++ b/src/solution/s0312_burst_balloons.rs
@@ -23,6 +23,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/burst-balloons/
+// discuss: https://leetcode.com/problems/burst-balloons/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 /*
diff --git a/src/solution/s0313_super_ugly_number.rs b/src/solution/s0313_super_ugly_number.rs
index 78c54fa8..bf99bcc8 100644
--- a/src/solution/s0313_super_ugly_number.rs
+++ b/src/solution/s0313_super_ugly_number.rs
@@ -25,6 +25,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/super-ugly-number/
+// discuss: https://leetcode.com/problems/super-ugly-number/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::cmp::Ordering;
diff --git a/src/solution/s0509_fibonacci_number.rs b/src/solution/s0509_fibonacci_number.rs
index b4a5d918..47a9b420 100644
--- a/src/solution/s0509_fibonacci_number.rs
+++ b/src/solution/s0509_fibonacci_number.rs
@@ -45,6 +45,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/fibonacci-number/
+// discuss: https://leetcode.com/problems/fibonacci-number/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s0704_binary_search.rs b/src/solution/s0704_binary_search.rs
index c75364ed..26ed0c8d 100644
--- a/src/solution/s0704_binary_search.rs
+++ b/src/solution/s0704_binary_search.rs
@@ -34,6 +34,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/binary-search/
+// discuss: https://leetcode.com/problems/binary-search/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 use std::cmp::Ordering;
 
diff --git a/src/solution/s0969_pancake_sorting.rs b/src/solution/s0969_pancake_sorting.rs
index 6a32ea04..541ae423 100644
--- a/src/solution/s0969_pancake_sorting.rs
+++ b/src/solution/s0969_pancake_sorting.rs
@@ -44,6 +44,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/pancake-sorting/
+// discuss: https://leetcode.com/problems/pancake-sorting/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s1018_binary_prefix_divisible_by_5.rs b/src/solution/s1018_binary_prefix_divisible_by_5.rs
index ff05f8c6..b2bb1839 100644
--- a/src/solution/s1018_binary_prefix_divisible_by_5.rs
+++ b/src/solution/s1018_binary_prefix_divisible_by_5.rs
@@ -47,6 +47,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/binary-prefix-divisible-by-5/
+// discuss: https://leetcode.com/problems/binary-prefix-divisible-by-5/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
diff --git a/src/solution/s1046_last_stone_weight.rs b/src/solution/s1046_last_stone_weight.rs
index cf0c81ac..871b4eb4 100644
--- a/src/solution/s1046_last_stone_weight.rs
+++ b/src/solution/s1046_last_stone_weight.rs
@@ -36,6 +36,9 @@
  */
 pub struct Solution {}
 
+// problem: https://leetcode.com/problems/last-stone-weight/
+// discuss: https://leetcode.com/problems/last-stone-weight/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 use std::collections::BinaryHeap;

From f1243fd9b0e02c7ef4fe4eb3ba9331853f3c5655 Mon Sep 17 00:00:00 2001
From: Tianyi Shi <ShiTianyi2001@outlook.com>
Date: Thu, 8 Oct 2020 13:13:42 +0100
Subject: [PATCH 36/47] fix 26

---
 src/solution/s0026_remove_duplicates_from_sorted_array.rs | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/solution/s0026_remove_duplicates_from_sorted_array.rs b/src/solution/s0026_remove_duplicates_from_sorted_array.rs
index 29ae1485..286b7c54 100644
--- a/src/solution/s0026_remove_duplicates_from_sorted_array.rs
+++ b/src/solution/s0026_remove_duplicates_from_sorted_array.rs
@@ -45,9 +45,9 @@
  */
 pub struct Solution {}
 
-// problem: https://leetcode.com/problems/remove-duplicates-from-sorted-array/
-// discuss: https://leetcode.com/problems/remove-duplicates-from-sorted-array/discuss/?currentPage=1&orderBy=most_votes&query=
-
+// problem: https://leetcode.com/problems/remove-duplicates-from-sorted-array/
+// discuss: https://leetcode.com/problems/remove-duplicates-from-sorted-array/discuss/?currentPage=1&orderBy=most_votes&query=
+
 // submission codes start here
 
 impl Solution {
@@ -63,6 +63,7 @@ impl Solution {
                 nums[slow] = nums[fast];
             }
         }
+        nums.truncate(slow + 1);
         (slow + 1) as i32
     }
 }

From 5b6949bde390f7d26a1cd499f611f32ed144d890 Mon Sep 17 00:00:00 2001
From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com>
Date: Wed, 15 Jun 2022 00:18:25 +0000
Subject: [PATCH 37/47] Bump net2 from 0.2.33 to 0.2.37

Bumps [net2](https://github.com/deprecrated/net2-rs) from 0.2.33 to 0.2.37.
- [Release notes](https://github.com/deprecrated/net2-rs/releases)
- [Commits](https://github.com/deprecrated/net2-rs/compare/0.2.33...0.2.37)

---
updated-dependencies:
- dependency-name: net2
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
---
 Cargo.lock | 1452 ++++++++++++++++++++++++++--------------------------
 1 file changed, 726 insertions(+), 726 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index a282f353..b89f8b5a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,2000 +1,2000 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "adler32"
 version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d2e7343e7fc9de883d1b0341e0b13970f764c14101234857d2ddafa1cb1cac2"
 
 [[package]]
 name = "aho-corasick"
 version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "58fb5e95d83b38284460a5fda7d6470aa0b8844d283a0b614b8535e880800d2d"
 dependencies = [
- "memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr",
 ]
 
 [[package]]
 name = "anyhow"
 version = "1.0.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7825f6833612eb2414095684fcf6c635becf3ce97fe48cf6421321e93bfbd53c"
 
 [[package]]
 name = "arrayvec"
 version = "0.4.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8d73f9beda665eaa98ab9e4f7442bd4e7de6652587de55b2525e52e29c1b0ba"
 dependencies = [
- "nodrop 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "nodrop",
 ]
 
 [[package]]
 name = "autocfg"
 version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b671c8fb71b457dd4ae18c4ba1e59aa81793daacc361d82fcd410cef0d491875"
 
 [[package]]
 name = "backtrace"
 version = "0.3.38"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "690a62be8920ccf773ee00ef0968649b0e724cda8bd5b12286302b4ae955fdf5"
 dependencies = [
- "backtrace-sys 0.1.31 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.62 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-demangle 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace-sys",
+ "cfg-if",
+ "libc",
+ "rustc-demangle",
 ]
 
 [[package]]
 name = "backtrace-sys"
 version = "0.1.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "82a830b4ef2d1124a711c71d263c5abdc710ef8e907bd508c88be475cebc422b"
 dependencies = [
- "cc 1.0.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.62 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc",
+ "libc",
 ]
 
 [[package]]
 name = "base64"
 version = "0.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b25d992356d2eb0ed82172f5248873db5560c4721f564b13cb5193bda5e668e"
 dependencies = [
- "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder",
 ]
 
 [[package]]
 name = "bitflags"
 version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a606a02debe2813760609f57a64a2ffd27d9fdf5b2f133eaca0b248dd92cdd2"
 
 [[package]]
 name = "bumpalo"
 version = "3.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5fb8038c1ddc0a5f73787b130f4cc75151e96ed33e417fde765eb5a81e3532f4"
 
 [[package]]
 name = "byteorder"
 version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a7c3dd8985a7111efc5c80b44e23ecdd8c007de8ade3b96595387e812b957cf5"
 
 [[package]]
 name = "bytes"
 version = "0.4.12"
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+checksum = "206fdffcfa2df7cbe15601ef46c813fce0965eb3286db6b56c583b814b51c81c"
 dependencies = [
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- "either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "iovec 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder",
+ "either",
+ "iovec",
 ]
 
 [[package]]
 name = "c2-chacha"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7d64d04786e0f528460fc884753cf8dddcc466be308f6026f8e355c41a0e4101"
 dependencies = [
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- "ppv-lite86 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
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+ "ppv-lite86",
 ]
 
 [[package]]
 name = "cc"
 version = "1.0.45"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4fc9a35e1f4290eb9e5fc54ba6cf40671ed2a2514c3eeb2b2a908dda2ea5a1be"
 
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 name = "cfg-if"
 version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
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 dependencies = [
- "bitflags 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
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 version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "888604f00b3db336d2af898ec3c1d5d0ddf5e6d462220f2ededc33a87ac4bbd5"
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- "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
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 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "46750b3f362965f197996c4448e4a0935e791bf7d6631bfce9ee0af3d24c919c"
 dependencies = [
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- "try_from 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cookie",
+ "failure",
+ "idna 0.1.5",
+ "log",
+ "publicsuffix",
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+ "winapi 0.2.8",
+ "winapi-build",
+]

From ff1388db643540aa30ba6e850a5c73956dc582e5 Mon Sep 17 00:00:00 2001
From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com>
Date: Wed, 15 Jun 2022 01:16:57 +0000
Subject: [PATCH 38/47] Bump smallvec from 0.6.10 to 0.6.14

Bumps [smallvec](https://github.com/servo/rust-smallvec) from 0.6.10 to 0.6.14.
- [Release notes](https://github.com/servo/rust-smallvec/releases)
- [Commits](https://github.com/servo/rust-smallvec/compare/v0.6.10...v0.6.14)

---
updated-dependencies:
- dependency-name: smallvec
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
---
 Cargo.lock | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index b89f8b5a..9bebf83e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -815,6 +815,12 @@ version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7ffc5c5338469d4d3ea17d269fa8ea3512ad247247c30bd2df69e68309ed0a08"
 
+[[package]]
+name = "maybe-uninit"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "60302e4db3a61da70c0cb7991976248362f30319e88850c487b9b95bbf059e00"
+
 [[package]]
 name = "memchr"
 version = "2.2.1"
@@ -1464,9 +1470,12 @@ dependencies = [
 
 [[package]]
 name = "smallvec"
-version = "0.6.10"
+version = "0.6.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ab606a9c5e214920bb66c458cd7be8ef094f813f20fe77a54cc7dbfff220d4b7"
+checksum = "b97fcaeba89edba30f044a10c6a3cc39df9c3f17d7cd829dd1446cab35f890e0"
+dependencies = [
+ "maybe-uninit",
+]
 
 [[package]]
 name = "socket2"

From afa1287b63aefce0e9f8a19f044e844b09af7e41 Mon Sep 17 00:00:00 2001
From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com>
Date: Wed, 15 Jun 2022 01:16:57 +0000
Subject: [PATCH 39/47] Bump bumpalo from 3.1.2 to 3.10.0

Bumps [bumpalo](https://github.com/fitzgen/bumpalo) from 3.1.2 to 3.10.0.
- [Release notes](https://github.com/fitzgen/bumpalo/releases)
- [Changelog](https://github.com/fitzgen/bumpalo/blob/main/CHANGELOG.md)
- [Commits](https://github.com/fitzgen/bumpalo/commits)

---
updated-dependencies:
- dependency-name: bumpalo
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
---
 Cargo.lock | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index b89f8b5a..68278849 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -77,9 +77,9 @@ checksum = "8a606a02debe2813760609f57a64a2ffd27d9fdf5b2f133eaca0b248dd92cdd2"
 
 [[package]]
 name = "bumpalo"
-version = "3.1.2"
+version = "3.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5fb8038c1ddc0a5f73787b130f4cc75151e96ed33e417fde765eb5a81e3532f4"
+checksum = "37ccbd214614c6783386c1af30caf03192f17891059cecc394b4fb119e363de3"
 
 [[package]]
 name = "byteorder"

From 9996bfdaf645c515b69c1b92a7a1b47f519abe43 Mon Sep 17 00:00:00 2001
From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com>
Date: Wed, 15 Jun 2022 01:17:01 +0000
Subject: [PATCH 40/47] Bump miow from 0.2.1 to 0.2.2

Bumps [miow](https://github.com/yoshuawuyts/miow) from 0.2.1 to 0.2.2.
- [Release notes](https://github.com/yoshuawuyts/miow/releases)
- [Changelog](https://github.com/yoshuawuyts/miow/blob/master/CHANGELOG.md)
- [Commits](https://github.com/yoshuawuyts/miow/compare/0.2.1...0.2.2)

---
updated-dependencies:
- dependency-name: miow
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
---
 Cargo.lock | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index b89f8b5a..3e1e5cb2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -875,9 +875,9 @@ dependencies = [
 
 [[package]]
 name = "miow"
-version = "0.2.1"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8c1f2f3b1cf331de6896aabf6e9d55dca90356cc9960cca7eaaf408a355ae919"
+checksum = "ebd808424166322d4a38da87083bfddd3ac4c131334ed55856112eb06d46944d"
 dependencies = [
  "kernel32-sys",
  "net2",

From f0cee845df38e05f0c9ac68048c9e12c77195bc8 Mon Sep 17 00:00:00 2001
From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com>
Date: Wed, 15 Jun 2022 01:17:02 +0000
Subject: [PATCH 41/47] Bump hyper from 0.12.35 to 0.12.36

Bumps [hyper](https://github.com/hyperium/hyper) from 0.12.35 to 0.12.36.
- [Release notes](https://github.com/hyperium/hyper/releases)
- [Changelog](https://github.com/hyperium/hyper/blob/v0.12.36/CHANGELOG.md)
- [Commits](https://github.com/hyperium/hyper/compare/v0.12.35...v0.12.36)

---
updated-dependencies:
- dependency-name: hyper
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
---
 Cargo.lock | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index b89f8b5a..4e594591 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -620,9 +620,9 @@ checksum = "cd179ae861f0c2e53da70d892f5f3029f9594be0c41dc5269cd371691b1dc2f9"
 
 [[package]]
 name = "hyper"
-version = "0.12.35"
+version = "0.12.36"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9dbe6ed1438e1f8ad955a4701e9a944938e9519f6888d12d8558b645e247d5f6"
+checksum = "5c843caf6296fc1f93444735205af9ed4e109a539005abb2564ae1d6fad34c52"
 dependencies = [
  "bytes",
  "futures 0.1.29",

From 7ce76081d343a1abd4fbe5ba1f48c63bd4172f09 Mon Sep 17 00:00:00 2001
From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com>
Date: Wed, 15 Jun 2022 01:18:34 +0000
Subject: [PATCH 42/47] Bump crossbeam-deque from 0.7.1 to 0.7.4

Bumps [crossbeam-deque](https://github.com/crossbeam-rs/crossbeam) from 0.7.1 to 0.7.4.
- [Release notes](https://github.com/crossbeam-rs/crossbeam/releases)
- [Changelog](https://github.com/crossbeam-rs/crossbeam/blob/master/CHANGELOG.md)
- [Commits](https://github.com/crossbeam-rs/crossbeam/compare/crossbeam-deque-0.7.1...crossbeam-deque-0.7.4)

---
updated-dependencies:
- dependency-name: crossbeam-deque
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
---
 Cargo.lock | 74 +++++++++++++++++++++++++++++++-----------------------
 1 file changed, 42 insertions(+), 32 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index b89f8b5a..b8b3cbed 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -24,19 +24,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7825f6833612eb2414095684fcf6c635becf3ce97fe48cf6421321e93bfbd53c"
 
 [[package]]
-name = "arrayvec"
-version = "0.4.11"
+name = "autocfg"
+version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b8d73f9beda665eaa98ab9e4f7442bd4e7de6652587de55b2525e52e29c1b0ba"
-dependencies = [
- "nodrop",
-]
+checksum = "b671c8fb71b457dd4ae18c4ba1e59aa81793daacc361d82fcd410cef0d491875"
 
 [[package]]
 name = "autocfg"
-version = "0.1.6"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b671c8fb71b457dd4ae18c4ba1e59aa81793daacc361d82fcd410cef0d491875"
+checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
 [[package]]
 name = "backtrace"
@@ -188,29 +185,31 @@ version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c8ec7fcd21571dc78f96cc96243cab8d8f035247c3efd16c687be154c3fa9efa"
 dependencies = [
- "crossbeam-utils",
+ "crossbeam-utils 0.6.6",
 ]
 
 [[package]]
 name = "crossbeam-deque"
-version = "0.7.1"
+version = "0.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b18cd2e169ad86297e6bc0ad9aa679aee9daa4f19e8163860faf7c164e4f5a71"
+checksum = "c20ff29ded3204c5106278a81a38f4b482636ed4fa1e6cfbeef193291beb29ed"
 dependencies = [
  "crossbeam-epoch",
- "crossbeam-utils",
+ "crossbeam-utils 0.7.2",
+ "maybe-uninit",
 ]
 
 [[package]]
 name = "crossbeam-epoch"
-version = "0.7.2"
+version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fedcd6772e37f3da2a9af9bf12ebe046c0dfe657992377b4df982a2b54cd37a9"
+checksum = "058ed274caafc1f60c4997b5fc07bf7dc7cca454af7c6e81edffe5f33f70dace"
 dependencies = [
- "arrayvec",
+ "autocfg 1.1.0",
  "cfg-if",
- "crossbeam-utils",
+ "crossbeam-utils 0.7.2",
  "lazy_static",
+ "maybe-uninit",
  "memoffset",
  "scopeguard",
 ]
@@ -221,7 +220,7 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7c979cd6cfe72335896575c6b5688da489e420d36a27a0b9eb0c73db574b4a4b"
 dependencies = [
- "crossbeam-utils",
+ "crossbeam-utils 0.6.6",
 ]
 
 [[package]]
@@ -234,6 +233,17 @@ dependencies = [
  "lazy_static",
 ]
 
+[[package]]
+name = "crossbeam-utils"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c3c7c73a2d1e9fc0886a08b93e98eb643461230d5f1925e4036204d5f2e261a8"
+dependencies = [
+ "autocfg 1.1.0",
+ "cfg-if",
+ "lazy_static",
+]
+
 [[package]]
 name = "curl"
 version = "0.4.25"
@@ -706,7 +716,7 @@ checksum = "17b77027f12e53ae59a379f7074259d32eb10867e6183388020e922832d9c3fb"
 dependencies = [
  "bytes",
  "crossbeam-channel",
- "crossbeam-utils",
+ "crossbeam-utils 0.6.6",
  "curl",
  "curl-sys",
  "futures-io-preview",
@@ -815,6 +825,12 @@ version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7ffc5c5338469d4d3ea17d269fa8ea3512ad247247c30bd2df69e68309ed0a08"
 
+[[package]]
+name = "maybe-uninit"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "60302e4db3a61da70c0cb7991976248362f30319e88850c487b9b95bbf059e00"
+
 [[package]]
 name = "memchr"
 version = "2.2.1"
@@ -914,12 +930,6 @@ dependencies = [
  "winapi 0.3.8",
 ]
 
-[[package]]
-name = "nodrop"
-version = "0.1.13"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2f9667ddcc6cc8a43afc9b7917599d7216aa09c463919ea32c59ed6cac8bc945"
-
 [[package]]
 name = "nom"
 version = "4.2.3"
@@ -965,7 +975,7 @@ version = "0.9.50"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2c42dcccb832556b5926bc9ae61e8775f2a61e725ab07ab3d1e7fcf8ae62c3b6"
 dependencies = [
- "autocfg",
+ "autocfg 0.1.6",
  "cc",
  "libc",
  "pkg-config",
@@ -1100,7 +1110,7 @@ version = "0.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6d71dacdc3c88c1fde3885a3be3fbab9f35724e6ce99467f7d9c5026132184ca"
 dependencies = [
- "autocfg",
+ "autocfg 0.1.6",
  "libc",
  "rand_chacha 0.1.1",
  "rand_core 0.4.2",
@@ -1132,7 +1142,7 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "556d3a1ca6600bfcbab7c7c91ccb085ac7fbbcd70e008a98742e7847f4f7bcef"
 dependencies = [
- "autocfg",
+ "autocfg 0.1.6",
  "rand_core 0.3.1",
 ]
 
@@ -1228,7 +1238,7 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "abf9b09b01790cfe0364f52bf32995ea3c39f4d2dd011eac241d2914146d0b44"
 dependencies = [
- "autocfg",
+ "autocfg 0.1.6",
  "rand_core 0.4.2",
 ]
 
@@ -1631,7 +1641,7 @@ version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0f27ee0e6db01c5f0b2973824547ce7e637b2ed79b891a9677b0de9bd532b6ac"
 dependencies = [
- "crossbeam-utils",
+ "crossbeam-utils 0.6.6",
  "futures 0.1.29",
 ]
 
@@ -1652,7 +1662,7 @@ version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c56391be9805bc80163151c0b9e5164ee64f4b0200962c346fea12773158f22d"
 dependencies = [
- "crossbeam-utils",
+ "crossbeam-utils 0.6.6",
  "futures 0.1.29",
  "lazy_static",
  "log",
@@ -1697,7 +1707,7 @@ checksum = "2bd2c6a3885302581f4401c82af70d792bb9df1700e7437b0aeb4ada94d5388c"
 dependencies = [
  "crossbeam-deque",
  "crossbeam-queue",
- "crossbeam-utils",
+ "crossbeam-utils 0.6.6",
  "futures 0.1.29",
  "lazy_static",
  "log",
@@ -1712,7 +1722,7 @@ version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f2106812d500ed25a4f38235b9cae8f78a09edf43203e16e59c3b769a342a60e"
 dependencies = [
- "crossbeam-utils",
+ "crossbeam-utils 0.6.6",
  "futures 0.1.29",
  "slab",
  "tokio-executor",

From 19319283bd7cd430267ea009cb6ea2b00e4a7cea Mon Sep 17 00:00:00 2001
From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com>
Date: Wed, 15 Jun 2022 03:47:23 +0000
Subject: [PATCH 43/47] Bump socket2 from 0.3.11 to 0.3.19

Bumps [socket2](https://github.com/rust-lang/socket2) from 0.3.11 to 0.3.19.
- [Release notes](https://github.com/rust-lang/socket2/releases)
- [Changelog](https://github.com/rust-lang/socket2/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/socket2/compare/0.3.11...v0.3.19)

---
updated-dependencies:
- dependency-name: socket2
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
---
 Cargo.lock | 49 +++++++++++++++++++++++++++----------------------
 1 file changed, 27 insertions(+), 22 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index b8b3cbed..eac83aa4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -42,7 +42,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "690a62be8920ccf773ee00ef0968649b0e724cda8bd5b12286302b4ae955fdf5"
 dependencies = [
  "backtrace-sys",
- "cfg-if",
+ "cfg-if 0.1.10",
  "libc",
  "rustc-demangle",
 ]
@@ -117,6 +117,12 @@ version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
 
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
 [[package]]
 name = "cloudabi"
 version = "0.0.3"
@@ -176,7 +182,7 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ba125de2af0df55319f41944744ad91c71113bf74a4646efff39afe1f6842db1"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
 ]
 
 [[package]]
@@ -206,7 +212,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "058ed274caafc1f60c4997b5fc07bf7dc7cca454af7c6e81edffe5f33f70dace"
 dependencies = [
  "autocfg 1.1.0",
- "cfg-if",
+ "cfg-if 0.1.10",
  "crossbeam-utils 0.7.2",
  "lazy_static",
  "maybe-uninit",
@@ -229,7 +235,7 @@ version = "0.6.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "04973fa96e96579258a5091af6003abde64af786b860f18622b82e026cca60e6"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
  "lazy_static",
 ]
 
@@ -240,7 +246,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c3c7c73a2d1e9fc0886a08b93e98eb643461230d5f1925e4036204d5f2e261a8"
 dependencies = [
  "autocfg 1.1.0",
- "cfg-if",
+ "cfg-if 0.1.10",
  "lazy_static",
 ]
 
@@ -293,7 +299,7 @@ version = "0.8.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "87240518927716f79692c2ed85bfe6e98196d18c6401ec75355760233a7e12e9"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
 ]
 
 [[package]]
@@ -334,7 +340,7 @@ version = "1.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ad3c5233c9a940c8719031b423d7e6c16af66e031cb0420b0896f5245bf181d3"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
  "crc32fast",
  "libc",
  "miniz_oxide",
@@ -567,7 +573,7 @@ version = "0.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "473a1265acc8ff1e808cd0a1af8cee3c2ee5200916058a2ca113c29f2d903571"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
  "libc",
  "wasi",
 ]
@@ -775,9 +781,9 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.62"
+version = "0.2.126"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "34fcd2c08d2f832f376f4173a231990fa5aef4e99fb569867318a227ef4c06ba"
+checksum = "349d5a591cd28b49e1d1037471617a32ddcda5731b99419008085f72d5a53836"
 
 [[package]]
 name = "libnghttp2-sys"
@@ -816,7 +822,7 @@ version = "0.4.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "14b6052be84e6b71ab17edffc2eeabf5c2c3ae1fdb464aae35ac50c67a44e1f7"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
 ]
 
 [[package]]
@@ -925,7 +931,7 @@ version = "0.2.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "391630d12b68002ae1e25e8f974306474966550ad82dac6886fb8910c19568ae"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
  "libc",
  "winapi 0.3.8",
 ]
@@ -956,7 +962,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2f372b2b53ce10fb823a337aaa674e3a7d072b957c6264d0f4ff0bd86e657449"
 dependencies = [
  "bitflags",
- "cfg-if",
+ "cfg-if 0.1.10",
  "foreign-types",
  "lazy_static",
  "libc",
@@ -999,7 +1005,7 @@ version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b876b1b9e7ac6e1a74a6da34d25c42e17e8862aa409cbbbdcfc8d86c6f3bc62b"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
  "cloudabi",
  "libc",
  "redox_syscall",
@@ -1480,13 +1486,12 @@ checksum = "ab606a9c5e214920bb66c458cd7be8ef094f813f20fe77a54cc7dbfff220d4b7"
 
 [[package]]
 name = "socket2"
-version = "0.3.11"
+version = "0.3.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e8b74de517221a2cb01a53349cf54182acdc31a074727d3079068448c0676d85"
+checksum = "122e570113d28d773067fab24266b66753f6ea915758651696b6e35e49f88d6e"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "libc",
- "redox_syscall",
  "winapi 0.3.8",
 ]
 
@@ -1567,7 +1572,7 @@ version = "3.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7a6e24d9338a0a5be79593e2fa15a648add6138caa803e2d5bc782c371732ca9"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
  "libc",
  "rand 0.7.2",
  "redox_syscall",
@@ -1740,7 +1745,7 @@ version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "283d3b89e1368717881a9d51dad843cc435380d8109c9e47d38780a324698d8b"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
 ]
 
 [[package]]
@@ -1854,7 +1859,7 @@ version = "0.2.58"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5205e9afdf42282b192e2310a5b463a6d1c1d774e30dc3c791ac37ab42d2616c"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
  "wasm-bindgen-macro",
 ]
 
@@ -1879,7 +1884,7 @@ version = "0.3.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "83420b37346c311b9ed822af41ec2e82839bfe99867ec6c54e2da43b7538771c"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
  "futures 0.1.29",
  "futures-channel-preview",
  "futures-util-preview",

From 18239979b507514cd5104d00f4940f82bf2c67b7 Mon Sep 17 00:00:00 2001
From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com>
Date: Wed, 15 Jun 2022 03:47:24 +0000
Subject: [PATCH 44/47] Bump http from 0.1.18 to 0.1.21

Bumps [http](https://github.com/hyperium/http) from 0.1.18 to 0.1.21.
- [Release notes](https://github.com/hyperium/http/releases)
- [Changelog](https://github.com/hyperium/http/blob/v0.1.21/CHANGELOG.md)
- [Commits](https://github.com/hyperium/http/compare/v0.1.18...v0.1.21)

---
updated-dependencies:
- dependency-name: http
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
---
 Cargo.lock | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index b8b3cbed..7d4bd9dd 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -601,9 +601,9 @@ dependencies = [
 
 [[package]]
 name = "http"
-version = "0.1.18"
+version = "0.1.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "372bcb56f939e449117fb0869c2e8fd8753a8223d92a172c6e808cf123a5b6e4"
+checksum = "d6ccf5ede3a895d8856620237b2f02972c1bbc78d2965ad7fe8838d4a0ed41f0"
 dependencies = [
  "bytes",
  "fnv",

From 97e672eac23e1881baaf081751777190621665c8 Mon Sep 17 00:00:00 2001
From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com>
Date: Fri, 17 Jun 2022 00:52:39 +0000
Subject: [PATCH 45/47] Bump futures-util from 0.3.4 to 0.3.21

Bumps [futures-util](https://github.com/rust-lang/futures-rs) from 0.3.4 to 0.3.21.
- [Release notes](https://github.com/rust-lang/futures-rs/releases)
- [Changelog](https://github.com/rust-lang/futures-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/futures-rs/compare/0.3.4...0.3.21)

---
updated-dependencies:
- dependency-name: futures-util
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
---
 Cargo.lock | 113 ++++++++++++++++++++++++-----------------------------
 1 file changed, 50 insertions(+), 63 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 60123c06..fe7a3919 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -412,9 +412,9 @@ dependencies = [
 
 [[package]]
 name = "futures-channel"
-version = "0.3.4"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f0c77d04ce8edd9cb903932b608268b3fffec4163dc053b3b402bf47eac1f1a8"
+checksum = "c3083ce4b914124575708913bca19bfe887522d6e2e6d0952943f5eac4a74010"
 dependencies = [
  "futures-core",
  "futures-sink",
@@ -432,9 +432,9 @@ dependencies = [
 
 [[package]]
 name = "futures-core"
-version = "0.3.4"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f25592f769825e89b92358db00d26f965761e094951ac44d3663ef25b7ac464a"
+checksum = "0c09fd04b7e4073ac7156a9539b57a484a8ea920f79c7c675d05d289ab6110d3"
 
 [[package]]
 name = "futures-core-preview"
@@ -477,9 +477,9 @@ dependencies = [
 
 [[package]]
 name = "futures-io"
-version = "0.3.4"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a638959aa96152c7a4cddf50fcb1e3fede0583b27157c26e67d6f99904090dc6"
+checksum = "fc4045962a5a5e935ee2fdedaa4e08284547402885ab326734432bed5d12966b"
 
 [[package]]
 name = "futures-io-preview"
@@ -489,14 +489,13 @@ checksum = "f4914ae450db1921a56c91bde97a27846287d062087d4a652efc09bb3a01ebda"
 
 [[package]]
 name = "futures-macro"
-version = "0.3.4"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9a5081aa3de1f7542a794a397cde100ed903b0630152d0973479018fd85423a7"
+checksum = "33c1e13800337f4d4d7a316bf45a567dbcb6ffe087f16424852d97e97a91f512"
 dependencies = [
- "proc-macro-hack",
- "proc-macro2 1.0.5",
+ "proc-macro2 1.0.39",
  "quote 1.0.2",
- "syn 1.0.5",
+ "syn 1.0.96",
 ]
 
 [[package]]
@@ -515,9 +514,9 @@ dependencies = [
 
 [[package]]
 name = "futures-sink"
-version = "0.3.4"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3466821b4bc114d95b087b850a724c6f83115e929bc88f1fa98a3304a944c8a6"
+checksum = "21163e139fa306126e6eedaf49ecdb4588f939600f0b1e770f4205ee4b7fa868"
 
 [[package]]
 name = "futures-sink-preview"
@@ -527,15 +526,15 @@ checksum = "86f148ef6b69f75bb610d4f9a2336d4fc88c4b5b67129d1a340dd0fd362efeec"
 
 [[package]]
 name = "futures-task"
-version = "0.3.4"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b0a34e53cf6cdcd0178aa573aed466b646eb3db769570841fda0c7ede375a27"
+checksum = "57c66a976bf5909d801bbef33416c41372779507e7a6b3a5e25e4749c58f776a"
 
 [[package]]
 name = "futures-util"
-version = "0.3.4"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "22766cf25d64306bedf0384da004d05c9974ab104fcc4528f1236181c18004c5"
+checksum = "d8b7abd5d659d9b90c8cba917f6ec750a74e2dc23902ef9cd4cc8c8b22e6036a"
 dependencies = [
  "futures-channel",
  "futures-core",
@@ -544,9 +543,8 @@ dependencies = [
  "futures-sink",
  "futures-task",
  "memchr",
+ "pin-project-lite",
  "pin-utils",
- "proc-macro-hack",
- "proc-macro-nested",
  "slab",
 ]
 
@@ -1026,11 +1024,17 @@ version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d4fd5641d01c8f18a23da7b6fe29298ff4b55afcccdf78973b24cf3175fee32e"
 
+[[package]]
+name = "pin-project-lite"
+version = "0.2.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e0a7ae3ac2f1173085d398531c705756c94a4c56843785df85a60c1a0afac116"
+
 [[package]]
 name = "pin-utils"
-version = "0.1.0-alpha.4"
+version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5894c618ce612a3fa23881b152b608bafb8c56cfc22f434a3ba3120b40f7b587"
+checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
 
 [[package]]
 name = "pkg-config"
@@ -1044,39 +1048,22 @@ version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e3cbf9f658cdb5000fcf6f362b8ea2ba154b9f146a61c7a20d647034c6b6561b"
 
-[[package]]
-name = "proc-macro-hack"
-version = "0.5.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ecd45702f76d6d3c75a80564378ae228a85f0b59d2f3ed43c91b4a69eb2ebfc5"
-dependencies = [
- "proc-macro2 1.0.5",
- "quote 1.0.2",
- "syn 1.0.5",
-]
-
-[[package]]
-name = "proc-macro-nested"
-version = "0.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "369a6ed065f249a159e06c45752c780bda2fb53c995718f9e484d08daa9eb42e"
-
 [[package]]
 name = "proc-macro2"
 version = "0.4.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf3d2011ab5c909338f7887f4fc896d35932e29146c12c8d01da6b22a80ba759"
 dependencies = [
- "unicode-xid 0.1.0",
+ "unicode-xid",
 ]
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.5"
+version = "1.0.39"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90cf5f418035b98e655e9cdb225047638296b862b42411c4e45bb88d700f7fc0"
+checksum = "c54b25569025b7fc9651de43004ae593a75ad88543b17178aa5e1b9c4f15f56f"
 dependencies = [
- "unicode-xid 0.2.0",
+ "unicode-ident",
 ]
 
 [[package]]
@@ -1107,7 +1094,7 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "053a8c8bcc71fcce321828dc897a98ab9760bef03a4fc36693c231e5b3216cfe"
 dependencies = [
- "proc-macro2 1.0.5",
+ "proc-macro2 1.0.39",
 ]
 
 [[package]]
@@ -1421,9 +1408,9 @@ version = "1.0.101"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4b133a43a1ecd55d4086bd5b4dc6c1751c68b1bfbeba7a5040442022c7e7c02e"
 dependencies = [
- "proc-macro2 1.0.5",
+ "proc-macro2 1.0.39",
  "quote 1.0.2",
- "syn 1.0.5",
+ "syn 1.0.96",
 ]
 
 [[package]]
@@ -1543,18 +1530,18 @@ checksum = "9ca4b3b69a77cbe1ffc9e198781b7acb0c7365a883670e8f1c1bc66fba79a5c5"
 dependencies = [
  "proc-macro2 0.4.30",
  "quote 0.6.13",
- "unicode-xid 0.1.0",
+ "unicode-xid",
 ]
 
 [[package]]
 name = "syn"
-version = "1.0.5"
+version = "1.0.96"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "66850e97125af79138385e9b88339cbcd037e3f28ceab8c5ad98e64f0f1f80bf"
+checksum = "0748dd251e24453cb8717f0354206b91557e4ec8703673a4b30208f2abaf1ebf"
 dependencies = [
- "proc-macro2 1.0.5",
+ "proc-macro2 1.0.39",
  "quote 1.0.2",
- "unicode-xid 0.2.0",
+ "unicode-ident",
 ]
 
 [[package]]
@@ -1566,7 +1553,7 @@ dependencies = [
  "proc-macro2 0.4.30",
  "quote 0.6.13",
  "syn 0.15.44",
- "unicode-xid 0.1.0",
+ "unicode-xid",
 ]
 
 [[package]]
@@ -1769,6 +1756,12 @@ dependencies = [
  "matches",
 ]
 
+[[package]]
+name = "unicode-ident"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5bd2fe26506023ed7b5e1e315add59d6f584c621d037f9368fea9cfb988f368c"
+
 [[package]]
 name = "unicode-normalization"
 version = "0.1.8"
@@ -1790,12 +1783,6 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fc72304796d0818e357ead4e000d19c9c174ab23dc11093ac919054d20a6a7fc"
 
-[[package]]
-name = "unicode-xid"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "826e7639553986605ec5979c7dd957c7895e93eabed50ab2ffa7f6128a75097c"
-
 [[package]]
 name = "url"
 version = "1.7.2"
@@ -1875,9 +1862,9 @@ dependencies = [
  "bumpalo",
  "lazy_static",
  "log",
- "proc-macro2 1.0.5",
+ "proc-macro2 1.0.39",
  "quote 1.0.2",
- "syn 1.0.5",
+ "syn 1.0.96",
  "wasm-bindgen-shared",
 ]
 
@@ -1913,9 +1900,9 @@ version = "0.2.58"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e85031354f25eaebe78bb7db1c3d86140312a911a106b2e29f9cc440ce3e7668"
 dependencies = [
- "proc-macro2 1.0.5",
+ "proc-macro2 1.0.39",
  "quote 1.0.2",
- "syn 1.0.5",
+ "syn 1.0.96",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
@@ -1935,9 +1922,9 @@ dependencies = [
  "anyhow",
  "heck",
  "log",
- "proc-macro2 1.0.5",
+ "proc-macro2 1.0.39",
  "quote 1.0.2",
- "syn 1.0.5",
+ "syn 1.0.96",
  "wasm-bindgen-backend",
  "weedle",
 ]

From 673093b49e0ef49a1a2613cccd244f318b09b6d3 Mon Sep 17 00:00:00 2001
From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com>
Date: Fri, 17 Jun 2022 01:03:46 +0000
Subject: [PATCH 46/47] Bump futures-task from 0.3.4 to 0.3.21

Bumps [futures-task](https://github.com/rust-lang/futures-rs) from 0.3.4 to 0.3.21.
- [Release notes](https://github.com/rust-lang/futures-rs/releases)
- [Changelog](https://github.com/rust-lang/futures-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/futures-rs/compare/0.3.4...0.3.21)

---
updated-dependencies:
- dependency-name: futures-task
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
---
 Cargo.lock | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 60123c06..51333019 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -527,9 +527,9 @@ checksum = "86f148ef6b69f75bb610d4f9a2336d4fc88c4b5b67129d1a340dd0fd362efeec"
 
 [[package]]
 name = "futures-task"
-version = "0.3.4"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b0a34e53cf6cdcd0178aa573aed466b646eb3db769570841fda0c7ede375a27"
+checksum = "57c66a976bf5909d801bbef33416c41372779507e7a6b3a5e25e4749c58f776a"
 
 [[package]]
 name = "futures-util"

From 57db4afb10b7a4a902107f32cb24c84c87bd7ac8 Mon Sep 17 00:00:00 2001
From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com>
Date: Fri, 17 Jun 2022 01:34:26 +0000
Subject: [PATCH 47/47] Bump thread_local from 1.0.1 to 1.1.4

Bumps [thread_local](https://github.com/Amanieu/thread_local-rs) from 1.0.1 to 1.1.4.
- [Release notes](https://github.com/Amanieu/thread_local-rs/releases)
- [Commits](https://github.com/Amanieu/thread_local-rs/compare/v1.0.1...1.1.4)

---
updated-dependencies:
- dependency-name: thread_local
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
---
 Cargo.lock | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 60123c06..09da0ecf 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -955,6 +955,12 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "once_cell"
+version = "1.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7709cef83f0c1f58f666e746a08b21e0085f7440fa6a29cc194d68aac97a4225"
+
 [[package]]
 name = "openssl"
 version = "0.10.25"
@@ -1585,11 +1591,11 @@ dependencies = [
 
 [[package]]
 name = "thread_local"
-version = "1.0.1"
+version = "1.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d40c6d1b69745a6ec6fb1ca717914848da4b44ae29d9b3080cbee91d72a69b14"
+checksum = "5516c27b78311c50bf42c071425c560ac799b11c30b31f87e3081965fe5e0180"
 dependencies = [
- "lazy_static",
+ "once_cell",
 ]
 
 [[package]]