| 0001 |
Two Sum |
Easy |
| 0002 |
Add Two Numbers |
Medium |
| 0003 |
Longest Substring Without Repeating Characters |
Medium |
| 0004 |
Median of Two Sorted Arrays |
Hard |
| 0005 |
Longest Palindromic Substring |
Medium |
| 0006 |
ZigZag Conversion |
Medium |
| 0007 |
Reverse Integer |
Easy |
| 0008 |
String to Integer (atoi) |
Medium |
| 0009 |
Palindrome Number |
Easy |
| 0010 |
Regular Expression Matching |
Hard |
| 0011 |
Container With Most Water |
Medium |
| 0012 |
Integer to Roman |
Medium |
| 0013 |
Roman to Integer |
Easy |
| 0014 |
Longest Common Prefix |
Easy |
| 0015 |
3Sum |
Medium |
| 0016 |
3Sum Closest |
Medium |
| 0017 |
Letter Combinations of a Phone Number |
Medium |
| 0018 |
4Sum |
Medium |
| 0019 |
Remove Nth Node From End of List |
Medium |
| 0020 |
Valid Parentheses |
Easy |
| 0021 |
Merge Two Sorted Lists |
Easy |
| 0022 |
Generate Parentheses |
Medium |
| 0023 |
Merge k Sorted Lists |
Hard |
| 0024 |
Swap Nodes in Pairs |
Medium |
| 0025 |
Reverse Nodes in k-Group |
Hard |
| 0026 |
Remove Duplicates from Sorted Array |
Easy |
| 0027 |
Remove Element |
Easy |
| 0028 |
Implement strStr() |
Easy |
| 0029 |
Divide Two Integers |
Medium |
| 0030 |
Substring with Concatenation of All Words |
Hard |
| 0031 |
Next Permutation |
Medium |
| 0032 |
Longest Valid Parentheses |
Hard |
| 0033 |
Search in Rotated Sorted Array |
Medium |
| 0034 |
Find First and Last Position of Element in Sorted Array |
Medium |
| 0035 |
Search Insert Position |
Easy |
| 0036 |
Valid Sudoku |
Medium |
| 0037 |
Sudoku Solver |
Hard |
| 0038 |
Count and Say |
Easy |
| 0039 |
Combination Sum |
Medium |
| 0040 |
Combination Sum II |
Medium |
| 0041 |
First Missing Positive |
Hard |
| 0042 |
Trapping Rain Water |
Hard |
| 0043 |
Multiply Strings |
Medium |
| 0044 |
Wildcard Matching |
Hard |
| 0045 |
Jump Game II |
Hard |
| 0046 |
Permutations |
Medium |
| 0047 |
Permutations II |
Medium |
| 0048 |
Rotate Image |
Medium |
| 0049 |
Group Anagrams |
Medium |
| 0050 |
Pow(x, n) |
Medium |
| 0051 |
N-Queens |
Hard |
| 0052 |
N-Queens II |
Hard |
| 0053 |
Maximum Subarray |
Easy |
| 0054 |
Spiral Matrix |
Medium |
| 0055 |
Jump Game |
Medium |
| 0056 |
Merge Intervals |
Medium |
| 0057 |
Insert Interval |
Hard |
| 0058 |
Length of Last Word |
Easy |
| 0059 |
Spiral Matrix II |
Medium |
| 0060 |
Permutation Sequence |
Medium |
| 0061 |
Rotate List |
Medium |
| 0062 |
Unique Paths |
Medium |
| 0063 |
Unique Paths II |
Medium |
| 0064 |
Minimum Path Sum |
Medium |
| 0065 |
Valid Number |
Hard |
| 0066 |
Plus One |
Easy |
| 0067 |
Add Binary |
Easy |
| 0068 |
Text Justification |
Hard |
| 0069 |
Sqrt(x) |
Easy |
| 0070 |
Climbing Stairs |
Easy |
| 0071 |
Simplify Path |
Medium |
| 0072 |
Edit Distance |
Hard |
| 0073 |
Set Matrix Zeroes |
Medium |
| 0074 |
Search a 2D Matrix |
Medium |
| 0075 |
Sort Colors |
Medium |
| 0076 |
Minimum Window Substring |
Hard |
| 0077 |
Combinations |
Medium |
| 0078 |
Subsets |
Medium |
| 0079 |
Word Search |
Medium |
| 0080 |
Remove Duplicates from Sorted Array II |
Medium |
| 0081 |
Search in Rotated Sorted Array II |
Medium |
| 0082 |
Remove Duplicates from Sorted List II |
Medium |
| 0083 |
Remove Duplicates from Sorted List |
Easy |
| 0084 |
Largest Rectangle in Histogram |
Hard |
| 0085 |
Maximal Rectangle |
Hard |
| 0086 |
Partition List |
Medium |
| 0087 |
Scramble String |
Hard |
| 0088 |
Merge Sorted Array |
Easy |
| 0089 |
Gray Code |
Medium |
| 0090 |
Subsets II |
Medium |
| 0091 |
Decode Ways |
Medium |
| 0092 |
Reverse Linked List II |
Medium |
| 0093 |
Restore IP Addresses |
Medium |
| 0094 |
Binary Tree Inorder Traversal |
Medium |
| 0095 |
Unique Binary Search Trees II |
Medium |
| 0096 |
Unique Binary Search Trees |
Medium |
| 0097 |
Interleaving String |
Hard |
| 0098 |
Validate Binary Search Tree |
Medium |
| 0099 |
Recover Binary Search Tree |
Hard |
| 0100 |
Same Tree |
Easy |
| 0101 |
Symmetric Tree |
Easy |
| 0102 |
Binary Tree Level Order Traversal |
Medium |
| 0103 |
Binary Tree Zigzag Level Order Traversal |
Medium |
| 0104 |
Maximum Depth of Binary Tree |
Easy |
| 0105 |
Construct Binary Tree from Preorder and Inorder Traversal |
Medium |
| 0106 |
Construct Binary Tree from Inorder and Postorder Traversal |
Medium |
| 0107 |
Binary Tree Level Order Traversal II |
Easy |
| 0108 |
Convert Sorted Array to Binary Search Tree |
Easy |
| 0109 |
Convert Sorted List to Binary Search Tree |
Medium |
| 0110 |
Balanced Binary Tree |
Easy |
| 0111 |
Minimum Depth of Binary Tree |
Easy |
| 0112 |
Path Sum |
Easy |
| 0113 |
Path Sum II |
Medium |
| 0114 |
Flatten Binary Tree to Linked List |
Medium |
| 0115 |
Distinct Subsequences |
Hard |
| 0116 |
Populating Next Right Pointers in Each Node |
Medium |
| 0117 |
Populating Next Right Pointers in Each Node II |
Medium |
| 0118 |
Pascal's Triangle |
Easy |
| 0119 |
Pascal's Triangle II |
Easy |
| 0120 |
Triangle |
Medium |
| 0121 |
Best Time to Buy and Sell Stock |
Easy |
| 0122 |
Best Time to Buy and Sell Stock II |
Easy |
| 0123 |
Best Time to Buy and Sell Stock III |
Hard |
| 0124 |
Binary Tree Maximum Path Sum |
Hard |
| 0125 |
Valid Palindrome |
Easy |
| 0126 |
Word Ladder II |
Hard |
| 0127 |
Word Ladder |
Medium |
| 0128 |
Longest Consecutive Sequence |
Hard |
| 0129 |
Sum Root to Leaf Numbers |
Medium |
| 0130 |
Surrounded Regions |
Medium |
| 0131 |
Palindrome Partitioning |
Medium |
| 0132 |
Palindrome Partitioning II |
Hard |
| 0133 |
Clone Graph |
Medium |
| 0134 |
Gas Station |
Medium |
| 0135 |
Candy |
Hard |
| 0136 |
Single Number |
Easy |
| 0137 |
Single Number II |
Medium |
| 0138 |
Copy List with Random Pointer |
Medium |
| 0139 |
Word Break |
Medium |
| 0140 |
Word Break II |
Hard |
| 0141 |
Linked List Cycle |
Easy |
| 0142 |
Linked List Cycle II |
Medium |
| 0143 |
Reorder List |
Medium |
| 0144 |
Binary Tree Preorder Traversal |
Medium |
| 0145 |
Binary Tree Postorder Traversal |
Hard |
| 0146 |
LRU Cache |
Medium |
| 0147 |
Insertion Sort List |
Medium |
| 0148 |
Sort List |
Medium |
| 0149 |
Max Points on a Line |
Hard |
| 0150 |
Evaluate Reverse Polish Notation |
Medium |
| 0151 |
Reverse Words in a String |
Medium |
| 0152 |
Maximum Product Subarray |
Medium |
| 0153 |
Find Minimum in Rotated Sorted Array |
Medium |
| 0154 |
Find Minimum in Rotated Sorted Array II |
Hard |
| 0155 |
Min Stack |
Easy |
| 0156 |
Binary Tree Upside Down |
Medium |
| 0157 |
Read N Characters Given Read4 |
Easy |
| 0158 |
Read N Characters Given Read4 II - Call multiple times |
Hard |
| 0159 |
Longest Substring with At Most Two Distinct Characters |
Medium |
| 0160 |
Intersection of Two Linked Lists |
Easy |
| 0161 |
One Edit Distance |
Medium |
| 0162 |
Find Peak Element |
Medium |
| 0163 |
Missing Ranges |
Medium |
| 0164 |
Maximum Gap |
Hard |
| 0165 |
Compare Version Numbers |
Medium |
| 0166 |
Fraction to Recurring Decimal |
Medium |
| 0167 |
Two Sum II - Input array is sorted |
Easy |
| 0168 |
Excel Sheet Column Title |
Easy |
| 0169 |
Majority Element |
Easy |
| 0170 |
Two Sum III - Data structure design |
Easy |
| 0171 |
Excel Sheet Column Number |
Easy |
| 0172 |
Factorial Trailing Zeroes |
Easy |
| 0173 |
Binary Search Tree Iterator |
Medium |
| 0174 |
Dungeon Game |
Hard |
| 0175 |
Combine Two Tables |
Easy |
| 0176 |
Second Highest Salary |
Easy |
| 0177 |
Nth Highest Salary |
Medium |
| 0178 |
Rank Scores |
Medium |
| 0179 |
Largest Number |
Medium |
| 0180 |
Consecutive Numbers |
Medium |
| 0181 |
Employees Earning More Than Their Managers |
Easy |
| 0182 |
Duplicate Emails |
Easy |
| 0183 |
Customers Who Never Order |
Easy |
| 0184 |
Department Highest Salary |
Medium |
| 0185 |
Department Top Three Salaries |
Hard |
| 0186 |
Reverse Words in a String II |
Medium |
| 0187 |
Repeated DNA Sequences |
Medium |
| 0188 |
Best Time to Buy and Sell Stock IV |
Hard |
| 0189 |
Rotate Array |
Easy |
| 0190 |
Reverse Bits |
Easy |
| 0191 |
Number of 1 Bits |
Easy |
| 0192 |
Word Frequency |
Medium |
| 0193 |
Valid Phone Numbers |
Easy |
| 0194 |
Transpose File |
Medium |
| 0195 |
Tenth Line |
Easy |
| 0196 |
Delete Duplicate Emails |
Easy |
| 0197 |
Rising Temperature |
Easy |
| 0198 |
House Robber |
Easy |
| 0199 |
Binary Tree Right Side View |
Medium |
| 0200 |
Number of Islands |
Medium |
| 0201 |
Bitwise AND of Numbers Range |
Medium |
| 0202 |
Happy Number |
Easy |
| 0203 |
Remove Linked List Elements |
Easy |
| 0204 |
Count Primes |
Easy |
| 0205 |
Isomorphic Strings |
Easy |
| 0206 |
Reverse Linked List |
Easy |
| 0207 |
Course Schedule |
Medium |
| 0208 |
Implement Trie (Prefix Tree) |
Medium |
| 0209 |
Minimum Size Subarray Sum |
Medium |
| 0210 |
Course Schedule II |
Medium |
| 0211 |
Add and Search Word - Data structure design |
Medium |
| 0212 |
Word Search II |
Hard |
| 0213 |
House Robber II |
Medium |
| 0214 |
Shortest Palindrome |
Hard |
| 0215 |
Kth Largest Element in an Array |
Medium |
| 0216 |
Combination Sum III |
Medium |
| 0217 |
Contains Duplicate |
Easy |
| 0218 |
The Skyline Problem |
Hard |
| 0219 |
Contains Duplicate II |
Easy |
| 0220 |
Contains Duplicate III |
Medium |
| 0221 |
Maximal Square |
Medium |
| 0222 |
Count Complete Tree Nodes |
Medium |
| 0223 |
Rectangle Area |
Medium |
| 0224 |
Basic Calculator |
Hard |
| 0225 |
Implement Stack using Queues |
Easy |
| 0226 |
Invert Binary Tree |
Easy |
| 0227 |
Basic Calculator II |
Medium |
| 0228 |
Summary Ranges |
Medium |
| 0229 |
Majority Element II |
Medium |
| 0230 |
Kth Smallest Element in a BST |
Medium |
| 0231 |
Power of Two |
Easy |
| 0232 |
Implement Queue using Stacks |
Easy |
| 0233 |
Number of Digit One |
Hard |
| 0234 |
Palindrome Linked List |
Easy |
| 0235 |
Lowest Common Ancestor of a Binary Search Tree |
Easy |
| 0236 |
Lowest Common Ancestor of a Binary Tree |
Medium |
| 0237 |
Delete Node in a Linked List |
Easy |
| 0238 |
Product of Array Except Self |
Medium |
| 0239 |
Sliding Window Maximum |
Hard |
| 0240 |
Search a 2D Matrix II |
Medium |
| 0241 |
Different Ways to Add Parentheses |
Medium |
| 0242 |
Valid Anagram |
Easy |
| 0243 |
Shortest Word Distance |
Easy |
| 0244 |
Shortest Word Distance II |
Medium |
| 0245 |
Shortest Word Distance III |
Medium |
| 0246 |
Strobogrammatic Number |
Easy |
| 0247 |
Strobogrammatic Number II |
Medium |
| 0248 |
Strobogrammatic Number III |
Hard |
| 0249 |
Group Shifted Strings |
Medium |
| 0250 |
Count Univalue Subtrees |
Medium |
| 0251 |
Flatten 2D Vector |
Medium |
| 0252 |
Meeting Rooms |
Easy |
| 0253 |
Meeting Rooms II |
Medium |
| 0254 |
Factor Combinations |
Medium |
| 0255 |
Verify Preorder Sequence in Binary Search Tree |
Medium |
| 0256 |
Paint House |
Easy |
| 0257 |
Binary Tree Paths |
Easy |
| 0258 |
Add Digits |
Easy |
| 0259 |
3Sum Smaller |
Medium |
| 0260 |
Single Number III |
Medium |
| 0261 |
Graph Valid Tree |
Medium |
| 0262 |
Trips and Users |
Hard |
| 0263 |
Ugly Number |
Easy |
| 0264 |
Ugly Number II |
Medium |
| 0265 |
Paint House II |
Hard |
| 0266 |
Palindrome Permutation |
Easy |
| 0267 |
Palindrome Permutation II |
Medium |
| 0268 |
Missing Number |
Easy |
| 0269 |
Alien Dictionary |
Hard |
| 0270 |
Closest Binary Search Tree Value |
Easy |
| 0271 |
Encode and Decode Strings |
Medium |
| 0272 |
Closest Binary Search Tree Value II |
Hard |
| 0273 |
Integer to English Words |
Hard |
| 0274 |
H-Index |
Medium |
| 0275 |
H-Index II |
Medium |
| 0276 |
Paint Fence |
Easy |
| 0277 |
Find the Celebrity |
Medium |
| 0278 |
First Bad Version |
Easy |
| 0279 |
Perfect Squares |
Medium |
| 0280 |
Wiggle Sort |
Medium |
| 0281 |
Zigzag Iterator |
Medium |
| 0282 |
Expression Add Operators |
Hard |
| 0283 |
Move Zeroes |
Easy |
| 0284 |
Peeking Iterator |
Medium |
| 0285 |
Inorder Successor in BST |
Medium |
| 0286 |
Walls and Gates |
Medium |
| 0287 |
Find the Duplicate Number |
Medium |
| 0288 |
Unique Word Abbreviation |
Medium |
| 0289 |
Game of Life |
Medium |
| 0290 |
Word Pattern |
Easy |
| 0291 |
Word Pattern II |
Hard |
| 0292 |
Nim Game |
Easy |
| 0293 |
Flip Game |
Easy |
| 0294 |
Flip Game II |
Medium |
| 0295 |
Find Median from Data Stream |
Hard |
| 0296 |
Best Meeting Point |
Hard |
| 0297 |
Serialize and Deserialize Binary Tree |
Hard |
| 0298 |
Binary Tree Longest Consecutive Sequence |
Medium |
| 0299 |
Bulls and Cows |
Easy |
| 0300 |
Longest Increasing Subsequence |
Medium |
| 0301 |
Remove Invalid Parentheses |
Hard |
| 0302 |
Smallest Rectangle Enclosing Black Pixels |
Hard |
| 0303 |
Range Sum Query - Immutable |
Easy |
| 0304 |
Range Sum Query 2D - Immutable |
Medium |
| 0305 |
Number of Islands II |
Hard |
| 0306 |
Additive Number |
Medium |
| 0307 |
Range Sum Query - Mutable |
Medium |
| 0308 |
Range Sum Query 2D - Mutable |
Hard |
| 0309 |
Best Time to Buy and Sell Stock with Cooldown |
Medium |
| 0310 |
Minimum Height Trees |
Medium |
| 0311 |
Sparse Matrix Multiplication |
Medium |
| 0312 |
Burst Balloons |
Hard |
| 0313 |
Super Ugly Number |
Medium |
| 0314 |
Binary Tree Vertical Order Traversal |
Medium |
| 0315 |
Count of Smaller Numbers After Self |
Hard |
| 0316 |
Remove Duplicate Letters |
Hard |
| 0317 |
Shortest Distance from All Buildings |
Hard |
| 0318 |
Maximum Product of Word Lengths |
Medium |
| 0319 |
Bulb Switcher |
Medium |
| 0320 |
Generalized Abbreviation |
Medium |
| 0321 |
Create Maximum Number |
Hard |
| 0322 |
Coin Change |
Medium |
| 0323 |
Number of Connected Components in an Undirected Graph |
Medium |
| 0324 |
Wiggle Sort II |
Medium |
| 0325 |
Maximum Size Subarray Sum Equals k |
Medium |
| 0326 |
Power of Three |
Easy |
| 0327 |
Count of Range Sum |
Hard |
| 0328 |
Odd Even Linked List |
Medium |
| 0329 |
Longest Increasing Path in a Matrix |
Hard |
| 0330 |
Patching Array |
Hard |
| 0331 |
Verify Preorder Serialization of a Binary Tree |
Medium |
| 0332 |
Reconstruct Itinerary |
Medium |
| 0333 |
Largest BST Subtree |
Medium |
| 0334 |
Increasing Triplet Subsequence |
Medium |
| 0335 |
Self Crossing |
Hard |
| 0336 |
Palindrome Pairs |
Hard |
| 0337 |
House Robber III |
Medium |
| 0338 |
Counting Bits |
Medium |
| 0339 |
Nested List Weight Sum |
Easy |
| 0340 |
Longest Substring with At Most K Distinct Characters |
Hard |
| 0341 |
Flatten Nested List Iterator |
Medium |
| 0342 |
Power of Four |
Easy |
| 0343 |
Integer Break |
Medium |
| 0344 |
Reverse String |
Easy |
| 0345 |
Reverse Vowels of a String |
Easy |
| 0346 |
Moving Average from Data Stream |
Easy |
| 0347 |
Top K Frequent Elements |
Medium |
| 0348 |
Design Tic-Tac-Toe |
Medium |
| 0349 |
Intersection of Two Arrays |
Easy |
| 0350 |
Intersection of Two Arrays II |
Easy |
| 0351 |
Android Unlock Patterns |
Medium |
| 0352 |
Data Stream as Disjoint Intervals |
Hard |
| 0353 |
Design Snake Game |
Medium |
| 0354 |
Russian Doll Envelopes |
Hard |
| 0355 |
Design Twitter |
Medium |
| 0356 |
Line Reflection |
Medium |
| 0357 |
Count Numbers with Unique Digits |
Medium |
| 0358 |
Rearrange String k Distance Apart |
Hard |
| 0359 |
Logger Rate Limiter |
Easy |
| 0360 |
Sort Transformed Array |
Medium |
| 0361 |
Bomb Enemy |
Medium |
| 0362 |
Design Hit Counter |
Medium |
| 0363 |
Max Sum of Rectangle No Larger Than K |
Hard |
| 0364 |
Nested List Weight Sum II |
Medium |
| 0365 |
Water and Jug Problem |
Medium |
| 0366 |
Find Leaves of Binary Tree |
Medium |
| 0367 |
Valid Perfect Square |
Easy |
| 0368 |
Largest Divisible Subset |
Medium |
| 0369 |
Plus One Linked List |
Medium |
| 0370 |
Range Addition |
Medium |
| 0371 |
Sum of Two Integers |
Easy |
| 0372 |
Super Pow |
Medium |
| 0373 |
Find K Pairs with Smallest Sums |
Medium |
| 0374 |
Guess Number Higher or Lower |
Easy |
| 0375 |
Guess Number Higher or Lower II |
Medium |
| 0376 |
Wiggle Subsequence |
Medium |
| 0377 |
Combination Sum IV |
Medium |
| 0378 |
Kth Smallest Element in a Sorted Matrix |
Medium |
| 0379 |
Design Phone Directory |
Medium |
| 0380 |
Insert Delete GetRandom O(1) |
Medium |
| 0381 |
Insert Delete GetRandom O(1) - Duplicates allowed |
Hard |
| 0382 |
Linked List Random Node |
Medium |
| 0383 |
Ransom Note |
Easy |
| 0384 |
Shuffle an Array |
Medium |
| 0385 |
Mini Parser |
Medium |
| 0386 |
Lexicographical Numbers |
Medium |
| 0387 |
First Unique Character in a String |
Easy |
| 0388 |
Longest Absolute File Path |
Medium |
| 0389 |
Find the Difference |
Easy |
| 0390 |
Elimination Game |
Medium |
| 0391 |
Perfect Rectangle |
Hard |
| 0392 |
Is Subsequence |
Easy |
| 0393 |
UTF-8 Validation |
Medium |
| 0394 |
Decode String |
Medium |
| 0395 |
Longest Substring with At Least K Repeating Characters |
Medium |
| 0396 |
Rotate Function |
Medium |
| 0397 |
Integer Replacement |
Medium |
| 0398 |
Random Pick Index |
Medium |
| 0399 |
Evaluate Division |
Medium |
| 0400 |
Nth Digit |
Medium |
| 0401 |
Binary Watch |
Easy |
| 0402 |
Remove K Digits |
Medium |
| 0403 |
Frog Jump |
Hard |
| 0404 |
Sum of Left Leaves |
Easy |
| 0405 |
Convert a Number to Hexadecimal |
Easy |
| 0406 |
Queue Reconstruction by Height |
Medium |
| 0407 |
Trapping Rain Water II |
Hard |
| 0408 |
Valid Word Abbreviation |
Easy |
| 0409 |
Longest Palindrome |
Easy |
| 0410 |
Split Array Largest Sum |
Hard |
| 0411 |
Minimum Unique Word Abbreviation |
Hard |
| 0412 |
Fizz Buzz |
Easy |
| 0413 |
Arithmetic Slices |
Medium |
| 0414 |
Third Maximum Number |
Easy |
| 0415 |
Add Strings |
Easy |
| 0416 |
Partition Equal Subset Sum |
Medium |
| 0417 |
Pacific Atlantic Water Flow |
Medium |
| 0418 |
Sentence Screen Fitting |
Medium |
| 0419 |
Battleships in a Board |
Medium |
| 0420 |
Strong Password Checker |
Hard |
| 0421 |
Maximum XOR of Two Numbers in an Array |
Medium |
| 0422 |
Valid Word Square |
Easy |
| 0423 |
Reconstruct Original Digits from English |
Medium |
| 0424 |
Longest Repeating Character Replacement |
Medium |
| 0425 |
Word Squares |
Hard |
| 0432 |
All O`one Data Structure |
Hard |
| 0433 |
Minimum Genetic Mutation |
Medium |
| 0434 |
Number of Segments in a String |
Easy |
| 0435 |
Non-overlapping Intervals |
Medium |
| 0436 |
Find Right Interval |
Medium |
| 0437 |
Path Sum III |
Easy |
| 0438 |
Find All Anagrams in a String |
Medium |
| 0439 |
Ternary Expression Parser |
Medium |
| 0440 |
K-th Smallest in Lexicographical Order |
Hard |
| 0441 |
Arranging Coins |
Easy |
| 0442 |
Find All Duplicates in an Array |
Medium |
| 0443 |
String Compression |
Easy |
| 0444 |
Sequence Reconstruction |
Medium |
| 0445 |
Add Two Numbers II |
Medium |
| 0446 |
Arithmetic Slices II - Subsequence |
Hard |
| 0447 |
Number of Boomerangs |
Easy |
| 0448 |
Find All Numbers Disappeared in an Array |
Easy |
| 0449 |
Serialize and Deserialize BST |
Medium |
| 0450 |
Delete Node in a BST |
Medium |
| 0451 |
Sort Characters By Frequency |
Medium |
| 0452 |
Minimum Number of Arrows to Burst Balloons |
Medium |
| 0453 |
Minimum Moves to Equal Array Elements |
Easy |
| 0454 |
4Sum II |
Medium |
| 0455 |
Assign Cookies |
Easy |
| 0456 |
132 Pattern |
Medium |
| 0457 |
Circular Array Loop |
Medium |
| 0458 |
Poor Pigs |
Hard |
| 0459 |
Repeated Substring Pattern |
Easy |
| 0460 |
LFU Cache |
Hard |
| 0461 |
Hamming Distance |
Easy |
| 0462 |
Minimum Moves to Equal Array Elements II |
Medium |
| 0463 |
Island Perimeter |
Easy |
| 0464 |
Can I Win |
Medium |
| 0465 |
Optimal Account Balancing |
Hard |
| 0466 |
Count The Repetitions |
Hard |
| 0467 |
Unique Substrings in Wraparound String |
Medium |
| 0468 |
Validate IP Address |
Medium |
| 0469 |
Convex Polygon |
Medium |
| 0471 |
Encode String with Shortest Length |
Hard |
| 0472 |
Concatenated Words |
Hard |
| 0473 |
Matchsticks to Square |
Medium |
| 0474 |
Ones and Zeroes |
Medium |
| 0475 |
Heaters |
Easy |
| 0476 |
Number Complement |
Easy |
| 0477 |
Total Hamming Distance |
Medium |
| 0479 |
Largest Palindrome Product |
Hard |
| 0480 |
Sliding Window Median |
Hard |
| 0481 |
Magical String |
Medium |
| 0482 |
License Key Formatting |
Easy |
| 0483 |
Smallest Good Base |
Hard |
| 0484 |
Find Permutation |
Medium |
| 0485 |
Max Consecutive Ones |
Easy |
| 0486 |
Predict the Winner |
Medium |
| 0487 |
Max Consecutive Ones II |
Medium |
| 0488 |
Zuma Game |
Hard |
| 0490 |
The Maze |
Medium |
| 0491 |
Increasing Subsequences |
Medium |
| 0492 |
Construct the Rectangle |
Easy |
| 0493 |
Reverse Pairs |
Hard |
| 0494 |
Target Sum |
Medium |
| 0495 |
Teemo Attacking |
Medium |
| 0496 |
Next Greater Element I |
Easy |
| 0498 |
Diagonal Traverse |
Medium |
| 0499 |
The Maze III |
Hard |
| 0500 |
Keyboard Row |
Easy |
| 0501 |
Find Mode in Binary Search Tree |
Easy |
| 0502 |
IPO |
Hard |
| 0503 |
Next Greater Element II |
Medium |
| 0504 |
Base 7 |
Easy |
| 0505 |
The Maze II |
Medium |
| 0506 |
Relative Ranks |
Easy |
| 0507 |
Perfect Number |
Easy |
| 0508 |
Most Frequent Subtree Sum |
Medium |
| 0509 |
Inorder Successor in BST II |
Medium |
| 0511 |
All Paths from Source Lead to Destination |
Medium |
| 0513 |
Find Bottom Left Tree Value |
Medium |
| 0514 |
Freedom Trail |
Hard |
| 0515 |
Find Largest Value in Each Tree Row |
Medium |
| 0516 |
Longest Palindromic Subsequence |
Medium |
| 0517 |
Super Washing Machines |
Hard |
| 0518 |
Coin Change 2 |
Medium |
| 0520 |
Detect Capital |
Easy |
| 0521 |
Longest Uncommon Subsequence I |
Easy |
| 0522 |
Longest Uncommon Subsequence II |
Medium |
| 0523 |
Continuous Subarray Sum |
Medium |
| 0524 |
Longest Word in Dictionary through Deleting |
Medium |
| 0525 |
Contiguous Array |
Medium |
| 0526 |
Beautiful Arrangement |
Medium |
| 0527 |
Word Abbreviation |
Hard |
| 0529 |
Minesweeper |
Medium |
| 0530 |
Minimum Absolute Difference in BST |
Easy |
| 0531 |
Lonely Pixel I |
Medium |
| 0532 |
K-diff Pairs in an Array |
Easy |
| 0533 |
Lonely Pixel II |
Medium |
| 0535 |
Encode and Decode TinyURL |
Medium |
| 0536 |
Construct Binary Tree from String |
Medium |
| 0537 |
Complex Number Multiplication |
Medium |
| 0538 |
Convert BST to Greater Tree |
Easy |
| 0539 |
Minimum Time Difference |
Medium |
| 0540 |
Single Element in a Sorted Array |
Medium |
| 0541 |
Reverse String II |
Easy |
| 0542 |
01 Matrix |
Medium |
| 0543 |
Diameter of Binary Tree |
Easy |
| 0544 |
Output Contest Matches |
Medium |
| 0545 |
Boundary of Binary Tree |
Medium |
| 0546 |
Remove Boxes |
Hard |
| 0547 |
Friend Circles |
Medium |
| 0548 |
Split Array with Equal Sum |
Medium |
| 0549 |
Binary Tree Longest Consecutive Sequence II |
Medium |
| 0551 |
Student Attendance Record I |
Easy |
| 0552 |
Student Attendance Record II |
Hard |
| 0553 |
Optimal Division |
Medium |
| 0554 |
Brick Wall |
Medium |
| 0555 |
Split Concatenated Strings |
Medium |
| 0556 |
Next Greater Element III |
Medium |
| 0557 |
Reverse Words in a String III |
Easy |
| 0560 |
Subarray Sum Equals K |
Medium |
| 0561 |
Array Partition I |
Easy |
| 0562 |
Longest Line of Consecutive One in Matrix |
Medium |
| 0563 |
Binary Tree Tilt |
Easy |
| 0564 |
Find the Closest Palindrome |
Hard |
| 0565 |
Array Nesting |
Medium |
| 0566 |
Reshape the Matrix |
Easy |
| 0567 |
Permutation in String |
Medium |
| 0568 |
Maximum Vacation Days |
Hard |
| 0569 |
Median Employee Salary |
Hard |
| 0570 |
Managers with at Least 5 Direct Reports |
Medium |
| 0571 |
Find Median Given Frequency of Numbers |
Hard |
| 0572 |
Subtree of Another Tree |
Easy |
| 0573 |
Squirrel Simulation |
Medium |
| 0574 |
Winning Candidate |
Medium |
| 0575 |
Distribute Candies |
Easy |
| 0576 |
Out of Boundary Paths |
Medium |
| 0577 |
Employee Bonus |
Easy |
| 0578 |
Get Highest Answer Rate Question |
Medium |
| 0579 |
Find Cumulative Salary of an Employee |
Hard |
| 0580 |
Count Student Number in Departments |
Medium |
| 0581 |
Shortest Unsorted Continuous Subarray |
Easy |
| 0582 |
Kill Process |
Medium |
| 0583 |
Delete Operation for Two Strings |
Medium |
| 0584 |
Find Customer Referee |
Easy |
| 0585 |
Investments in 2016 |
Medium |
| 0586 |
Customer Placing the Largest Number of Orders |
Easy |
| 0587 |
Erect the Fence |
Hard |
| 0588 |
Design In-Memory File System |
Hard |
| 0591 |
Tag Validator |
Hard |
| 0592 |
Fraction Addition and Subtraction |
Medium |
| 0593 |
Valid Square |
Medium |
| 0594 |
Longest Harmonious Subsequence |
Easy |
| 0595 |
Big Countries |
Easy |
| 0596 |
Classes More Than 5 Students |
Easy |
| 0597 |
Friend Requests I: Overall Acceptance Rate |
Easy |
| 0598 |
Range Addition II |
Easy |
| 0599 |
Minimum Index Sum of Two Lists |
Easy |
| 0600 |
Non-negative Integers without Consecutive Ones |
Hard |
| 0601 |
Human Traffic of Stadium |
Hard |
| 0602 |
Friend Requests II: Who Has the Most Friends |
Medium |
| 0603 |
Consecutive Available Seats |
Easy |
| 0604 |
Design Compressed String Iterator |
Easy |
| 0605 |
Can Place Flowers |
Easy |
| 0606 |
Construct String from Binary Tree |
Easy |
| 0607 |
Sales Person |
Easy |
| 0608 |
Tree Node |
Medium |
| 0609 |
Find Duplicate File in System |
Medium |
| 0610 |
Triangle Judgement |
Easy |
| 0611 |
Valid Triangle Number |
Medium |
| 0612 |
Shortest Distance in a Plane |
Medium |
| 0613 |
Shortest Distance in a Line |
Easy |
| 0614 |
Second Degree Follower |
Medium |
| 0615 |
Average Salary: Departments VS Company |
Hard |
| 0616 |
Add Bold Tag in String |
Medium |
| 0617 |
Merge Two Binary Trees |
Easy |
| 0618 |
Students Report By Geography |
Hard |
| 0619 |
Biggest Single Number |
Easy |
| 0620 |
Not Boring Movies |
Easy |
| 0621 |
Task Scheduler |
Medium |
| 0623 |
Add One Row to Tree |
Medium |
| 0624 |
Maximum Distance in Arrays |
Easy |
| 0625 |
Minimum Factorization |
Medium |
| 0626 |
Exchange Seats |
Medium |
| 0627 |
Swap Salary |
Easy |
| 0628 |
Maximum Product of Three Numbers |
Easy |
| 0629 |
K Inverse Pairs Array |
Hard |
| 0630 |
Course Schedule III |
Hard |
| 0631 |
Design Excel Sum Formula |
Hard |
| 0632 |
Smallest Range Covering Elements from K Lists |
Hard |
| 0633 |
Sum of Square Numbers |
Easy |
| 0634 |
Find the Derangement of An Array |
Medium |
| 0635 |
Design Log Storage System |
Medium |
| 0636 |
Exclusive Time of Functions |
Medium |
| 0637 |
Average of Levels in Binary Tree |
Easy |
| 0638 |
Shopping Offers |
Medium |
| 0639 |
Decode Ways II |
Hard |
| 0640 |
Solve the Equation |
Medium |
| 0642 |
Design Search Autocomplete System |
Hard |
| 0643 |
Maximum Average Subarray I |
Easy |
| 0644 |
Maximum Average Subarray II |
Hard |
| 0645 |
Set Mismatch |
Easy |
| 0646 |
Maximum Length of Pair Chain |
Medium |
| 0647 |
Palindromic Substrings |
Medium |
| 0648 |
Replace Words |
Medium |
| 0649 |
Dota2 Senate |
Medium |
| 0650 |
2 Keys Keyboard |
Medium |
| 0651 |
4 Keys Keyboard |
Medium |
| 0652 |
Find Duplicate Subtrees |
Medium |
| 0653 |
Two Sum IV - Input is a BST |
Easy |
| 0654 |
Maximum Binary Tree |
Medium |
| 0655 |
Print Binary Tree |
Medium |
| 0656 |
Coin Path |
Hard |
| 0657 |
Robot Return to Origin |
Easy |
| 0658 |
Find K Closest Elements |
Medium |
| 0659 |
Split Array into Consecutive Subsequences |
Medium |
| 0660 |
Remove 9 |
Hard |
| 0661 |
Image Smoother |
Easy |
| 0662 |
Maximum Width of Binary Tree |
Medium |
| 0663 |
Equal Tree Partition |
Medium |
| 0664 |
Strange Printer |
Hard |
| 0665 |
Non-decreasing Array |
Easy |
| 0666 |
Path Sum IV |
Medium |
| 0667 |
Beautiful Arrangement II |
Medium |
| 0668 |
Kth Smallest Number in Multiplication Table |
Hard |
| 0669 |
Trim a Binary Search Tree |
Easy |
| 0670 |
Maximum Swap |
Medium |
| 0671 |
Second Minimum Node In a Binary Tree |
Easy |
| 0672 |
Bulb Switcher II |
Medium |
| 0673 |
Number of Longest Increasing Subsequence |
Medium |
| 0674 |
Longest Continuous Increasing Subsequence |
Easy |
| 0675 |
Cut Off Trees for Golf Event |
Hard |
| 0676 |
Implement Magic Dictionary |
Medium |
| 0677 |
Map Sum Pairs |
Medium |
| 0678 |
Valid Parenthesis String |
Medium |
| 0679 |
24 Game |
Hard |
| 0680 |
Valid Palindrome II |
Easy |
| 0681 |
Next Closest Time |
Medium |
| 0682 |
Baseball Game |
Easy |
| 0683 |
K Empty Slots |
Hard |
| 0684 |
Redundant Connection |
Medium |
| 0685 |
Redundant Connection II |
Hard |
| 0686 |
Repeated String Match |
Easy |
| 0687 |
Longest Univalue Path |
Easy |
| 0688 |
Knight Probability in Chessboard |
Medium |
| 0689 |
Maximum Sum of 3 Non-Overlapping Subarrays |
Hard |
| 0690 |
Employee Importance |
Easy |
| 0691 |
Stickers to Spell Word |
Hard |
| 0692 |
Top K Frequent Words |
Medium |
| 0693 |
Binary Number with Alternating Bits |
Easy |
| 0694 |
Number of Distinct Islands |
Medium |
| 0695 |
Max Area of Island |
Medium |
| 0696 |
Count Binary Substrings |
Easy |
| 0697 |
Degree of an Array |
Easy |
| 0698 |
Partition to K Equal Sum Subsets |
Medium |
| 0699 |
Falling Squares |
Hard |
| 0711 |
Number of Distinct Islands II |
Hard |
| 0712 |
Minimum ASCII Delete Sum for Two Strings |
Medium |
| 0713 |
Subarray Product Less Than K |
Medium |
| 0714 |
Best Time to Buy and Sell Stock with Transaction Fee |
Medium |
| 0715 |
Range Module |
Hard |
| 0716 |
Max Stack |
Easy |
| 0717 |
1-bit and 2-bit Characters |
Easy |
| 0718 |
Maximum Length of Repeated Subarray |
Medium |
| 0719 |
Find K-th Smallest Pair Distance |
Hard |
| 0720 |
Longest Word in Dictionary |
Easy |
| 0721 |
Accounts Merge |
Medium |
| 0722 |
Remove Comments |
Medium |
| 0723 |
Candy Crush |
Medium |
| 0724 |
Find Pivot Index |
Easy |
| 0725 |
Split Linked List in Parts |
Medium |
| 0726 |
Number of Atoms |
Hard |
| 0727 |
Minimum Window Subsequence |
Hard |
| 0728 |
Self Dividing Numbers |
Easy |
| 0729 |
My Calendar I |
Medium |
| 0730 |
Count Different Palindromic Subsequences |
Hard |
| 0731 |
My Calendar II |
Medium |
| 0732 |
My Calendar III |
Hard |
| 0733 |
Flood Fill |
Easy |
| 0734 |
Sentence Similarity |
Easy |
| 0735 |
Asteroid Collision |
Medium |
| 0736 |
Parse Lisp Expression |
Hard |
| 0737 |
Sentence Similarity II |
Medium |
| 0738 |
Monotone Increasing Digits |
Medium |
| 0739 |
Daily Temperatures |
Medium |
| 0740 |
Delete and Earn |
Medium |
| 0741 |
Cherry Pickup |
Hard |
| 0742 |
To Lower Case |
Easy |
| 0743 |
Closest Leaf in a Binary Tree |
Medium |
| 0744 |
Network Delay Time |
Medium |
| 0745 |
Find Smallest Letter Greater Than Target |
Easy |
| 0746 |
Prefix and Suffix Search |
Hard |
| 0747 |
Min Cost Climbing Stairs |
Easy |
| 0748 |
Largest Number At Least Twice of Others |
Easy |
| 0749 |
Shortest Completing Word |
Easy |
| 0750 |
Contain Virus |
Hard |
| 0751 |
Number Of Corner Rectangles |
Medium |
| 0752 |
IP to CIDR |
Easy |
| 0753 |
Open the Lock |
Medium |
| 0754 |
Cracking the Safe |
Hard |
| 0755 |
Reach a Number |
Medium |
| 0756 |
Pour Water |
Medium |
| 0757 |
Pyramid Transition Matrix |
Medium |
| 0758 |
Convert Binary Search Tree to Sorted Doubly Linked List |
Medium |
| 0759 |
Set Intersection Size At Least Two |
Hard |
| 0760 |
Bold Words in String |
Easy |
| 0761 |
Employee Free Time |
Hard |
| 0762 |
Find Anagram Mappings |
Easy |
| 0763 |
Special Binary String |
Hard |
| 0764 |
N-ary Tree Level Order Traversal |
Medium |
| 0765 |
Serialize and Deserialize N-ary Tree |
Hard |
| 0766 |
Flatten a Multilevel Doubly Linked List |
Medium |
| 0767 |
Prime Number of Set Bits in Binary Representation |
Easy |
| 0768 |
Partition Labels |
Medium |
| 0769 |
Largest Plus Sign |
Medium |
| 0770 |
Couples Holding Hands |
Hard |
| 0771 |
Encode N-ary Tree to Binary Tree |
Hard |
| 0772 |
Construct Quad Tree |
Medium |
| 0773 |
Logical OR of Two Binary Grids Represented as Quad-Trees |
Medium |
| 0774 |
Maximum Depth of N-ary Tree |
Easy |
| 0775 |
N-ary Tree Preorder Traversal |
Easy |
| 0776 |
N-ary Tree Postorder Traversal |
Easy |
| 0777 |
Toeplitz Matrix |
Easy |
| 0778 |
Reorganize String |
Medium |
| 0779 |
Max Chunks To Make Sorted II |
Hard |
| 0780 |
Max Chunks To Make Sorted |
Medium |
| 0781 |
Basic Calculator IV |
Hard |
| 0782 |
Jewels and Stones |
Easy |
| 0783 |
Search in a Binary Search Tree |
Easy |
| 0784 |
Insert into a Binary Search Tree |
Medium |
| 0785 |
Basic Calculator III |
Hard |
| 0786 |
Search in a Sorted Array of Unknown Size |
Medium |
| 0787 |
Sliding Puzzle |
Hard |
| 0788 |
Minimize Max Distance to Gas Station |
Hard |
| 0789 |
Kth Largest Element in a Stream |
Easy |
| 0790 |
Global and Local Inversions |
Medium |
| 0791 |
Split BST |
Medium |
| 0792 |
Binary Search |
Easy |
| 0793 |
Swap Adjacent in LR String |
Medium |
| 0794 |
Swim in Rising Water |
Hard |
| 0795 |
K-th Symbol in Grammar |
Medium |
| 0796 |
Reaching Points |
Hard |
| 0797 |
Rabbits in Forest |
Medium |
| 0798 |
Transform to Chessboard |
Hard |
| 0799 |
Minimum Distance Between BST Nodes |
Easy |
| 0800 |
Letter Case Permutation |
Easy |
| 0801 |
Is Graph Bipartite? |
Medium |
| 0802 |
K-th Smallest Prime Fraction |
Hard |
| 0803 |
Cheapest Flights Within K Stops |
Medium |
| 0804 |
Rotated Digits |
Easy |
| 0805 |
Escape The Ghosts |
Medium |
| 0806 |
Domino and Tromino Tiling |
Medium |
| 0807 |
Custom Sort String |
Medium |
| 0808 |
Number of Matching Subsequences |
Medium |
| 0809 |
Preimage Size of Factorial Zeroes Function |
Hard |
| 0810 |
Valid Tic-Tac-Toe State |
Medium |
| 0811 |
Number of Subarrays with Bounded Maximum |
Medium |
| 0812 |
Rotate String |
Easy |
| 0813 |
All Paths From Source to Target |
Medium |
| 0814 |
Smallest Rotation with Highest Score |
Hard |
| 0815 |
Champagne Tower |
Medium |
| 0816 |
Design HashSet |
Easy |
| 0817 |
Design HashMap |
Easy |
| 0818 |
Similar RGB Color |
Easy |
| 0819 |
Minimum Swaps To Make Sequences Increasing |
Medium |
| 0820 |
Find Eventual Safe States |
Medium |
| 0821 |
Bricks Falling When Hit |
Hard |
| 0822 |
Unique Morse Code Words |
Easy |
| 0823 |
Split Array With Same Average |
Hard |
| 0824 |
Number of Lines To Write String |
Easy |
| 0825 |
Max Increase to Keep City Skyline |
Medium |
| 0826 |
Soup Servings |
Medium |
| 0827 |
Expressive Words |
Medium |
| 0828 |
Chalkboard XOR Game |
Hard |
| 0829 |
Subdomain Visit Count |
Easy |
| 0830 |
Largest Triangle Area |
Easy |
| 0831 |
Largest Sum of Averages |
Medium |
| 0832 |
Binary Tree Pruning |
Medium |
| 0833 |
Bus Routes |
Hard |
| 0834 |
Ambiguous Coordinates |
Medium |
| 0835 |
Linked List Components |
Medium |
| 0836 |
Race Car |
Hard |
| 0837 |
Most Common Word |
Easy |
| 0838 |
Design Linked List |
Medium |
| 0839 |
Short Encoding of Words |
Medium |
| 0841 |
Shortest Distance to a Character |
Easy |
| 0842 |
Card Flipping Game |
Medium |
| 0843 |
Binary Trees With Factors |
Medium |
| 0850 |
Insert into a Sorted Circular Linked List |
Medium |
| 0851 |
Goat Latin |
Easy |
| 0852 |
Friends Of Appropriate Ages |
Medium |
| 0853 |
Most Profit Assigning Work |
Medium |
| 0854 |
Making A Large Island |
Hard |
| 0855 |
Count Unique Characters of All Substrings of a Given String |
Hard |
| 0856 |
Consecutive Numbers Sum |
Hard |
| 0857 |
Positions of Large Groups |
Easy |
| 0858 |
Masking Personal Information |
Medium |
| 0859 |
Design Circular Deque |
Medium |
| 0860 |
Design Circular Queue |
Medium |
| 0861 |
Flipping an Image |
Easy |
| 0862 |
Find And Replace in String |
Medium |
| 0863 |
Sum of Distances in Tree |
Hard |
| 0864 |
Image Overlap |
Medium |
| 0865 |
Robot Room Cleaner |
Hard |
| 0866 |
Rectangle Overlap |
Easy |
| 0867 |
New 21 Game |
Medium |
| 0868 |
Push Dominoes |
Medium |
| 0869 |
Similar String Groups |
Hard |
| 0870 |
Magic Squares In Grid |
Easy |
| 0871 |
Keys and Rooms |
Medium |
| 0872 |
Split Array into Fibonacci Sequence |
Medium |
| 0873 |
Guess the Word |
Hard |
| 0874 |
Backspace String Compare |
Easy |
| 0875 |
Longest Mountain in Array |
Medium |
| 0876 |
Hand of Straights |
Medium |
| 0877 |
Shortest Path Visiting All Nodes |
Hard |
| 0878 |
Shifting Letters |
Medium |
| 0879 |
Maximize Distance to Closest Person |
Easy |
| 0880 |
Rectangle Area II |
Hard |
| 0881 |
Loud and Rich |
Medium |
| 0882 |
Peak Index in a Mountain Array |
Easy |
| 0883 |
Car Fleet |
Medium |
| 0884 |
K-Similar Strings |
Hard |
| 0885 |
Exam Room |
Medium |
| 0886 |
Score of Parentheses |
Medium |
| 0887 |
Minimum Cost to Hire K Workers |
Hard |
| 0888 |
Mirror Reflection |
Medium |
| 0889 |
Buddy Strings |
Easy |
| 0890 |
Lemonade Change |
Easy |
| 0891 |
Score After Flipping Matrix |
Medium |
| 0892 |
Shortest Subarray with Sum at Least K |
Hard |
| 0893 |
All Nodes Distance K in Binary Tree |
Medium |
| 0894 |
Random Pick with Blacklist |
Hard |
| 0895 |
Shortest Path to Get All Keys |
Hard |
| 0896 |
Smallest Subtree with all the Deepest Nodes |
Medium |
| 0897 |
Prime Palindrome |
Medium |
| 0898 |
Transpose Matrix |
Easy |
| 0899 |
Binary Gap |
Easy |
| 0900 |
Reordered Power of 2 |
Medium |
| 0901 |
Advantage Shuffle |
Medium |
| 0902 |
Minimum Number of Refueling Stops |
Hard |
| 0903 |
Implement Rand10() Using Rand7() |
Medium |
| 0904 |
Leaf-Similar Trees |
Easy |
| 0905 |
Length of Longest Fibonacci Subsequence |
Medium |
| 0906 |
Walking Robot Simulation |
Easy |
| 0907 |
Koko Eating Bananas |
Medium |
| 0908 |
Middle of the Linked List |
Easy |
| 0909 |
Stone Game |
Medium |
| 0910 |
Nth Magical Number |
Hard |
| 0911 |
Profitable Schemes |
Hard |
| 0912 |
Random Pick with Weight |
Medium |
| 0913 |
Random Flip Matrix |
Medium |
| 0914 |
Random Point in Non-overlapping Rectangles |
Medium |
| 0915 |
Generate Random Point in a Circle |
Medium |
| 0916 |
Decoded String at Index |
Medium |
| 0917 |
Boats to Save People |
Medium |
| 0918 |
Reachable Nodes In Subdivided Graph |
Hard |
| 0919 |
Projection Area of 3D Shapes |
Easy |
| 0920 |
Uncommon Words from Two Sentences |
Easy |
| 0921 |
Spiral Matrix III |
Medium |
| 0922 |
Possible Bipartition |
Medium |
| 0923 |
Super Egg Drop |
Hard |
| 0924 |
Fair Candy Swap |
Easy |
| 0925 |
Construct Binary Tree from Preorder and Postorder Traversal |
Medium |
| 0926 |
Find and Replace Pattern |
Medium |
| 0927 |
Sum of Subsequence Widths |
Hard |
| 0928 |
Surface Area of 3D Shapes |
Easy |
| 0929 |
Groups of Special-Equivalent Strings |
Easy |
| 0930 |
All Possible Full Binary Trees |
Medium |
| 0931 |
Maximum Frequency Stack |
Hard |
| 0932 |
Monotonic Array |
Easy |
| 0933 |
Increasing Order Search Tree |
Easy |
| 0934 |
Bitwise ORs of Subarrays |
Medium |
| 0935 |
Orderly Queue |
Hard |
| 0936 |
RLE Iterator |
Medium |
| 0937 |
Online Stock Span |
Medium |
| 0938 |
Numbers At Most N Given Digit Set |
Hard |
| 0939 |
Valid Permutations for DI Sequence |
Hard |
| 0940 |
Fruit Into Baskets |
Medium |
| 0941 |
Sort Array By Parity |
Easy |
| 0942 |
Super Palindromes |
Hard |
| 0943 |
Sum of Subarray Minimums |
Medium |
| 0944 |
Smallest Range I |
Easy |
| 0945 |
Snakes and Ladders |
Medium |
| 0946 |
Smallest Range II |
Medium |
| 0947 |
Online Election |
Medium |
| 0948 |
Sort an Array |
Medium |
| 0949 |
Cat and Mouse |
Hard |
| 0950 |
X of a Kind in a Deck of Cards |
Easy |
| 0951 |
Partition Array into Disjoint Intervals |
Medium |
| 0952 |
Word Subsets |
Medium |
| 0953 |
Reverse Only Letters |
Easy |
| 0954 |
Maximum Sum Circular Subarray |
Medium |
| 0955 |
Complete Binary Tree Inserter |
Medium |
| 0956 |
Number of Music Playlists |
Hard |
| 0957 |
Minimum Add to Make Parentheses Valid |
Medium |
| 0958 |
Sort Array By Parity II |
Easy |
| 0959 |
3Sum With Multiplicity |
Medium |
| 0960 |
Minimize Malware Spread |
Hard |
| 0961 |
Long Pressed Name |
Easy |
| 0962 |
Flip String to Monotone Increasing |
Medium |
| 0963 |
Three Equal Parts |
Hard |
| 0964 |
Minimize Malware Spread II |
Hard |
| 0965 |
Unique Email Addresses |
Easy |
| 0966 |
Binary Subarrays With Sum |
Medium |
| 0967 |
Minimum Falling Path Sum |
Medium |
| 0968 |
Beautiful Array |
Medium |
| 0969 |
Number of Recent Calls |
Easy |
| 0971 |
Shortest Bridge |
Medium |
| 0972 |
Knight Dialer |
Medium |
| 0973 |
Stamping The Sequence |
Hard |
| 0974 |
Reorder Data in Log Files |
Easy |
| 0975 |
Range Sum of BST |
Easy |
| 0976 |
Minimum Area Rectangle |
Medium |
| 0977 |
Distinct Subsequences II |
Hard |
| 0978 |
Valid Mountain Array |
Easy |
| 0979 |
DI String Match |
Easy |
| 0980 |
Find the Shortest Superstring |
Hard |
| 0981 |
Delete Columns to Make Sorted |
Easy |
| 0982 |
Minimum Increment to Make Array Unique |
Medium |
| 0983 |
Validate Stack Sequences |
Medium |
| 0984 |
Most Stones Removed with Same Row or Column |
Medium |
| 0985 |
Bag of Tokens |
Medium |
| 0986 |
Largest Time for Given Digits |
Easy |
| 0987 |
Reveal Cards In Increasing Order |
Medium |
| 0988 |
Flip Equivalent Binary Trees |
Medium |
| 0989 |
Largest Component Size by Common Factor |
Hard |
| 0990 |
Verifying an Alien Dictionary |
Easy |
| 0991 |
Array of Doubled Pairs |
Medium |
| 0992 |
Delete Columns to Make Sorted II |
Medium |
| 0993 |
Tallest Billboard |
Hard |
| 0994 |
Prison Cells After N Days |
Medium |
| 0998 |
Check Completeness of a Binary Tree |
Medium |
| 0999 |
Regions Cut By Slashes |
Medium |
| 1000 |
Delete Columns to Make Sorted III |
Hard |
| 1001 |
N-Repeated Element in Size 2N Array |
Easy |
| 1002 |
Maximum Width Ramp |
Medium |
| 1003 |
Minimum Area Rectangle II |
Medium |
| 1004 |
Least Operators to Express Number |
Hard |
| 1005 |
Univalued Binary Tree |
Easy |
| 1006 |
Vowel Spellchecker |
Medium |
| 1007 |
Numbers With Same Consecutive Differences |
Medium |
| 1008 |
Binary Tree Cameras |
Hard |
| 1009 |
Pancake Sorting |
Medium |
| 1010 |
Powerful Integers |
Easy |
| 1011 |
Flip Binary Tree To Match Preorder Traversal |
Medium |
| 1012 |
Equal Rational Numbers |
Hard |
| 1013 |
Fibonacci Number |
Easy |
| 1014 |
K Closest Points to Origin |
Medium |
| 1016 |
Subarray Sums Divisible by K |
Medium |
| 1017 |
Odd Even Jump |
Hard |
| 1018 |
Largest Perimeter Triangle |
Easy |
| 1019 |
Squares of a Sorted Array |
Easy |
| 1020 |
Longest Turbulent Subarray |
Medium |
| 1021 |
Distribute Coins in Binary Tree |
Medium |
| 1022 |
Unique Paths III |
Hard |
| 1023 |
Time Based Key-Value Store |
Medium |
| 1024 |
Triples with Bitwise AND Equal To Zero |
Hard |
| 1025 |
Minimum Cost For Tickets |
Medium |
| 1026 |
String Without AAA or BBB |
Medium |
| 1027 |
Sum of Even Numbers After Queries |
Easy |
| 1028 |
Interval List Intersections |
Medium |
| 1029 |
Vertical Order Traversal of a Binary Tree |
Medium |
| 1030 |
Smallest String Starting From Leaf |
Medium |
| 1031 |
Add to Array-Form of Integer |
Easy |
| 1032 |
Satisfiability of Equality Equations |
Medium |
| 1033 |
Broken Calculator |
Medium |
| 1034 |
Subarrays with K Different Integers |
Hard |
| 1035 |
Cousins in Binary Tree |
Easy |
| 1036 |
Rotting Oranges |
Easy |
| 1037 |
Minimum Number of K Consecutive Bit Flips |
Hard |
| 1038 |
Number of Squareful Arrays |
Hard |
| 1039 |
Find the Town Judge |
Easy |
| 1040 |
Maximum Binary Tree II |
Medium |
| 1041 |
Available Captures for Rook |
Easy |
| 1042 |
Minimum Cost to Merge Stones |
Hard |
| 1043 |
Grid Illumination |
Hard |
| 1044 |
Find Common Characters |
Easy |
| 1045 |
Check If Word Is Valid After Substitutions |
Medium |
| 1046 |
Max Consecutive Ones III |
Medium |
| 1047 |
Maximize Sum Of Array After K Negations |
Easy |
| 1048 |
Clumsy Factorial |
Medium |
| 1049 |
Minimum Domino Rotations For Equal Row |
Medium |
| 1050 |
Construct Binary Search Tree from Preorder Traversal |
Medium |
| 1051 |
Shortest Way to Form String |
Medium |
| 1052 |
Campus Bikes |
Medium |
| 1053 |
Minimize Rounding Error to Meet Target |
Medium |
| 1054 |
Complement of Base 10 Integer |
Easy |
| 1055 |
Pairs of Songs With Total Durations Divisible by 60 |
Easy |
| 1056 |
Capacity To Ship Packages Within D Days |
Medium |
| 1057 |
Numbers With Repeated Digits |
Hard |
| 1058 |
Lexicographically Smallest Equivalent String |
Medium |
| 1059 |
Missing Element in Sorted Array |
Medium |
| 1060 |
Longest Repeating Substring |
Medium |
| 1061 |
Number of Valid Subarrays |
Hard |
| 1062 |
Partition Array Into Three Parts With Equal Sum |
Easy |
| 1063 |
Best Sightseeing Pair |
Medium |
| 1064 |
Smallest Integer Divisible by K |
Medium |
| 1065 |
Binary String With Substrings Representing 1 To N |
Medium |
| 1066 |
Fixed Point |
Easy |
| 1067 |
Campus Bikes II |
Medium |
| 1068 |
Digit Count in Range |
Hard |
| 1069 |
Confusing Number |
Easy |
| 1070 |
Convert to Base -2 |
Medium |
| 1071 |
Binary Prefix Divisible By 5 |
Easy |
| 1072 |
Next Greater Node In Linked List |
Medium |
| 1073 |
Number of Enclaves |
Medium |
| 1074 |
High Five |
Easy |
| 1075 |
Index Pairs of a String |
Easy |
| 1076 |
Brace Expansion |
Medium |
| 1077 |
Confusing Number II |
Hard |
| 1078 |
Remove Outermost Parentheses |
Easy |
| 1079 |
Sum of Root To Leaf Binary Numbers |
Easy |
| 1080 |
Camelcase Matching |
Medium |
| 1081 |
Video Stitching |
Medium |
| 1082 |
Sum of Digits in the Minimum Number |
Easy |
| 1083 |
Two Sum Less Than K |
Easy |
| 1084 |
Find K-Length Substrings With No Repeated Characters |
Medium |
| 1085 |
The Earliest Moment When Everyone Become Friends |
Medium |
| 1086 |
Divisor Game |
Easy |
| 1087 |
Longest Arithmetic Sequence |
Medium |
| 1088 |
Number of Days in a Month |
Easy |
| 1089 |
Remove Vowels from a String |
Easy |
| 1090 |
Armstrong Number |
Easy |
| 1091 |
Maximum Average Subtree |
Medium |
| 1092 |
Maximum Difference Between Node and Ancestor |
Medium |
| 1093 |
Recover a Tree From Preorder Traversal |
Hard |
| 1094 |
Matrix Cells in Distance Order |
Easy |
| 1095 |
Two City Scheduling |
Easy |
| 1096 |
Maximum Sum of Two Non-Overlapping Subarrays |
Medium |
| 1097 |
Stream of Characters |
Hard |
| 1098 |
Largest Unique Number |
Easy |
| 1099 |
Path With Maximum Minimum Value |
Medium |
| 1100 |
Connecting Cities With Minimum Cost |
Medium |
| 1101 |
Parallel Courses |
Hard |
| 1102 |
Check If a Number Is Majority Element in a Sorted Array |
Easy |
| 1103 |
Moving Stones Until Consecutive |
Easy |
| 1104 |
Coloring A Border |
Medium |
| 1105 |
Uncrossed Lines |
Medium |
| 1106 |
Escape a Large Maze |
Hard |
| 1107 |
Minimum Swaps to Group All 1's Together |
Medium |
| 1108 |
Analyze User Website Visit Pattern |
Medium |
| 1111 |
Minimum Score Triangulation of Polygon |
Medium |
| 1112 |
Find Words That Can Be Formed by Characters |
Easy |
| 1113 |
Moving Stones Until Consecutive II |
Medium |
| 1114 |
Binary Search Tree to Greater Sum Tree |
Medium |
| 1115 |
Valid Boomerang |
Easy |
| 1116 |
Maximum Level Sum of a Binary Tree |
Medium |
| 1117 |
As Far from Land as Possible |
Medium |
| 1118 |
Divide Array Into Increasing Sequences |
Hard |
| 1119 |
Robot Bounded In Circle |
Medium |
| 1120 |
Flower Planting With No Adjacent |
Easy |
| 1121 |
Partition Array for Maximum Sum |
Medium |
| 1122 |
Longest Duplicate Substring |
Hard |
| 1123 |
Single-Row Keyboard |
Easy |
| 1124 |
String Transforms Into Another String |
Hard |
| 1125 |
Design File System |
Medium |
| 1126 |
Minimum Cost to Connect Sticks |
Medium |
| 1127 |
Last Stone Weight |
Easy |
| 1128 |
Remove All Adjacent Duplicates In String |
Easy |
| 1129 |
Longest String Chain |
Medium |
| 1130 |
Last Stone Weight II |
Medium |
| 1131 |
Count Substrings with Only One Distinct Letter |
Easy |
| 1132 |
Before and After Puzzle |
Medium |
| 1133 |
Last Substring in Lexicographical Order |
Hard |
| 1134 |
Shortest Distance to Target Color |
Medium |
| 1135 |
Customers Who Bought All Products |
Medium |
| 1136 |
Actors and Directors Who Cooperated At Least Three Times |
Easy |
| 1137 |
Height Checker |
Easy |
| 1138 |
Grumpy Bookstore Owner |
Medium |
| 1139 |
Previous Permutation With One Swap |
Medium |
| 1140 |
Distant Barcodes |
Medium |
| 1141 |
How Many Apples Can You Put into the Basket |
Easy |
| 1142 |
Minimum Knight Moves |
Medium |
| 1143 |
Find Smallest Common Element in All Rows |
Medium |
| 1144 |
Optimize Water Distribution in a Village |
Hard |
| 1145 |
Number of Submatrices That Sum to Target |
Hard |
| 1146 |
Greatest Common Divisor of Strings |
Easy |
| 1147 |
Flip Columns For Maximum Number of Equal Rows |
Medium |
| 1148 |
Adding Two Negabinary Numbers |
Medium |
| 1149 |
Intersection of Three Sorted Arrays |
Easy |
| 1150 |
Two Sum BSTs |
Medium |
| 1151 |
Stepping Numbers |
Medium |
| 1152 |
Maximum Number of Ones |
Hard |
| 1153 |
Product Sales Analysis I |
Easy |
| 1154 |
Product Sales Analysis II |
Easy |
| 1155 |
Product Sales Analysis III |
Medium |
| 1156 |
Occurrences After Bigram |
Easy |
| 1157 |
Insufficient Nodes in Root to Leaf Paths |
Medium |
| 1159 |
Smallest Subsequence of Distinct Characters |
Medium |
| 1160 |
Letter Tile Possibilities |
Medium |
| 1161 |
Project Employees I |
Easy |
| 1162 |
Project Employees II |
Easy |
| 1163 |
Project Employees III |
Medium |
| 1164 |
Missing Number In Arithmetic Progression |
Easy |
| 1165 |
Meeting Scheduler |
Medium |
| 1166 |
Toss Strange Coins |
Medium |
| 1167 |
Minimum Time to Build Blocks |
Hard |
| 1168 |
Duplicate Zeros |
Easy |
| 1169 |
Largest Values From Labels |
Medium |
| 1170 |
Shortest Common Supersequence |
Hard |
| 1171 |
Shortest Path in Binary Matrix |
Medium |
| 1172 |
Sales Analysis I |
Easy |
| 1173 |
Sales Analysis II |
Easy |
| 1174 |
Sales Analysis III |
Easy |
| 1175 |
Array Transformation |
Easy |
| 1176 |
Design A Leaderboard |
Medium |
| 1177 |
Tree Diameter |
Medium |
| 1178 |
Valid Palindrome III |
Hard |
| 1179 |
Game Play Analysis I |
Easy |
| 1180 |
Game Play Analysis II |
Easy |
| 1181 |
Game Play Analysis III |
Medium |
| 1182 |
Game Play Analysis IV |
Medium |
| 1183 |
Statistics from a Large Sample |
Medium |
| 1184 |
Car Pooling |
Medium |
| 1185 |
Find in Mountain Array |
Hard |
| 1186 |
Building H2O |
Medium |
| 1187 |
Print FooBar Alternately |
Medium |
| 1188 |
Brace Expansion II |
Hard |
| 1189 |
Encode Number |
Medium |
| 1190 |
Smallest Common Region |
Medium |
| 1191 |
Synonymous Sentences |
Medium |
| 1192 |
Divide Chocolate |
Hard |
| 1193 |
Game Play Analysis V |
Hard |
| 1194 |
Path In Zigzag Labelled Binary Tree |
Medium |
| 1195 |
Distribute Candies to People |
Easy |
| 1196 |
Filling Bookcase Shelves |
Medium |
| 1197 |
Parsing A Boolean Expression |
Hard |
| 1198 |
Unpopular Books |
Medium |
| 1199 |
Hexspeak |
Easy |
| 1200 |
Remove Interval |
Medium |
| 1201 |
Delete Tree Nodes |
Medium |
| 1202 |
Palindrome Removal |
Hard |
| 1203 |
Print in Order |
Easy |
| 1204 |
New Users Daily Count |
Medium |
| 1205 |
Defanging an IP Address |
Easy |
| 1206 |
Corporate Flight Bookings |
Medium |
| 1207 |
Delete Nodes And Return Forest |
Medium |
| 1208 |
Maximum Nesting Depth of Two Valid Parentheses Strings |
Medium |
| 1209 |
Design Bounded Blocking Queue |
Medium |
| 1211 |
Iterator for Combination |
Medium |
| 1212 |
Sequential Digits |
Medium |
| 1213 |
Handshakes That Don't Cross |
Hard |
| 1214 |
Highest Grade For Each Student |
Medium |
| 1215 |
Reported Posts |
Easy |
| 1216 |
Print Zero Even Odd |
Medium |
| 1217 |
Relative Sort Array |
Easy |
| 1218 |
Lowest Common Ancestor of Deepest Leaves |
Medium |
| 1219 |
Longest Well-Performing Interval |
Medium |
| 1220 |
Smallest Sufficient Team |
Hard |
| 1221 |
Element Appearing More Than 25% In Sorted Array |
Easy |
| 1222 |
Remove Covered Intervals |
Medium |
| 1224 |
Minimum Falling Path Sum II |
Hard |
| 1225 |
Active Businesses |
Medium |
| 1226 |
User Purchase Platform |
Hard |
| 1227 |
Number of Equivalent Domino Pairs |
Easy |
| 1228 |
Minimum Cost Tree From Leaf Values |
Medium |
| 1229 |
Shortest Path with Alternating Colors |
Medium |
| 1230 |
Maximum of Absolute Value Expression |
Medium |
| 1231 |
Replace Elements with Greatest Element on Right Side |
Easy |
| 1232 |
Sum of Mutated Array Closest to Target |
Medium |
| 1233 |
Number of Ships in a Rectangle |
Hard |
| 1234 |
Number of Paths with Max Score |
Hard |
| 1236 |
N-th Tribonacci Number |
Easy |
| 1237 |
Reported Posts II |
Medium |
| 1238 |
Alphabet Board Path |
Medium |
| 1239 |
Largest 1-Bordered Square |
Medium |
| 1240 |
Stone Game II |
Medium |
| 1241 |
Decompress Run-Length Encoded List |
Easy |
| 1242 |
Matrix Block Sum |
Medium |
| 1243 |
Sum of Nodes with Even-Valued Grandparent |
Medium |
| 1244 |
Distinct Echo Substrings |
Hard |
| 1245 |
User Activity for the Past 30 Days I |
Easy |
| 1246 |
User Activity for the Past 30 Days II |
Easy |
| 1247 |
Decrease Elements To Make Array Zigzag |
Medium |
| 1248 |
Binary Tree Coloring Game |
Medium |
| 1249 |
Snapshot Array |
Medium |
| 1250 |
Longest Common Subsequence |
Medium |
| 1251 |
Longest Chunked Palindrome Decomposition |
Hard |
| 1252 |
Break a Palindrome |
Medium |
| 1253 |
Sort the Matrix Diagonally |
Medium |
| 1254 |
Deepest Leaves Sum |
Medium |
| 1255 |
Reverse Subarray To Maximize Array Value |
Hard |
| 1256 |
Rank Transform of an Array |
Easy |
| 1258 |
Article Views I |
Easy |
| 1259 |
Article Views II |
Medium |
| 1260 |
Day of the Year |
Easy |
| 1261 |
Swap For Longest Repeated Character Substring |
Medium |
| 1262 |
Online Majority Element In Subarray |
Hard |
| 1263 |
Number of Dice Rolls With Target Sum |
Medium |
| 1267 |
Remove Zero Sum Consecutive Nodes from Linked List |
Medium |
| 1268 |
Market Analysis I |
Medium |
| 1269 |
Market Analysis II |
Hard |
| 1270 |
Dinner Plate Stacks |
Hard |
| 1271 |
Web Crawler |
Medium |
| 1272 |
Invalid Transactions |
Medium |
| 1273 |
Compare Strings by Frequency of the Smallest Character |
Easy |
| 1274 |
Number of Days Between Two Dates |
Easy |
| 1275 |
Validate Binary Tree Nodes |
Medium |
| 1276 |
Closest Divisors |
Medium |
| 1277 |
Largest Multiple of Three |
Hard |
| 1278 |
Product Price at a Given Date |
Medium |
| 1279 |
Prime Arrangements |
Easy |
| 1280 |
Diet Plan Performance |
Easy |
| 1281 |
Can Make Palindrome from Substring |
Medium |
| 1282 |
Number of Valid Words for Each Puzzle |
Hard |
| 1285 |
Balance a Binary Search Tree |
Medium |
| 1287 |
Distance Between Bus Stops |
Easy |
| 1288 |
Maximum Subarray Sum with One Deletion |
Medium |
| 1289 |
Day of the Week |
Easy |
| 1290 |
Make Array Strictly Increasing |
Hard |
| 1291 |
Immediate Food Delivery I |
Easy |
| 1292 |
Immediate Food Delivery II |
Medium |
| 1297 |
Maximum Number of Balloons |
Easy |
| 1298 |
Reverse Substrings Between Each Pair of Parentheses |
Medium |
| 1299 |
K-Concatenation Maximum Sum |
Medium |
| 1300 |
Critical Connections in a Network |
Hard |
| 1301 |
Reformat Department Table |
Easy |
| 1306 |
Minimum Absolute Difference |
Easy |
| 1307 |
Ugly Number III |
Medium |
| 1308 |
Smallest String With Swaps |
Medium |
| 1309 |
Sort Items by Groups Respecting Dependencies |
Hard |
| 1316 |
Fizz Buzz Multithreaded |
Medium |
| 1317 |
Monthly Transactions I |
Medium |
| 1318 |
Tournament Winners |
Hard |
| 1319 |
Unique Number of Occurrences |
Easy |
| 1320 |
Remove All Adjacent Duplicates in String II |
Medium |
| 1321 |
Get Equal Substrings Within Budget |
Medium |
| 1322 |
Minimum Moves to Reach Target with Rotations |
Hard |
| 1327 |
Last Person to Fit in the Elevator |
Medium |
| 1328 |
Monthly Transactions II |
Medium |
| 1329 |
Play with Chips |
Easy |
| 1330 |
Longest Arithmetic Subsequence of Given Difference |
Medium |
| 1331 |
Path with Maximum Gold |
Medium |
| 1332 |
Count Vowels Permutation |
Hard |
| 1337 |
Design Skiplist |
Hard |
| 1338 |
Queries Quality and Percentage |
Easy |
| 1339 |
Team Scores in Football Tournament |
Medium |
| 1340 |
The Dining Philosophers |
Medium |
| 1341 |
Split a String in Balanced Strings |
Easy |
| 1342 |
Queens That Can Attack the King |
Medium |
| 1343 |
Dice Roll Simulation |
Medium |
| 1344 |
Maximum Equal Frequency |
Hard |
| 1349 |
Check If It Is a Straight Line |
Easy |
| 1350 |
Remove Sub-Folders from the Filesystem |
Medium |
| 1351 |
Replace the Substring for Balanced String |
Medium |
| 1352 |
Maximum Profit in Job Scheduling |
Hard |
| 1357 |
Report Contiguous Dates |
Hard |
| 1358 |
Find Positive Integer Solution for a Given Equation |
Easy |
| 1359 |
Circular Permutation in Binary Representation |
Medium |
| 1360 |
Maximum Length of a Concatenated String with Unique Characters |
Medium |
| 1361 |
Tiling a Rectangle with the Fewest Squares |
Hard |
| 1362 |
Airplane Seat Assignment Probability |
Medium |
| 1368 |
Web Crawler Multithreaded |
Medium |
| 1369 |
Minimum Swaps to Make Strings Equal |
Medium |
| 1370 |
Count Number of Nice Subarrays |
Medium |
| 1371 |
Minimum Remove to Make Valid Parentheses |
Medium |
| 1372 |
Check If It Is a Good Array |
Hard |
| 1377 |
Number of Comments per Post |
Easy |
| 1378 |
Cells with Odd Values in a Matrix |
Easy |
| 1379 |
Reconstruct a 2-Row Binary Matrix |
Medium |
| 1380 |
Number of Closed Islands |
Medium |
| 1381 |
Maximum Score Words Formed by Letters |
Hard |
| 1386 |
Shift 2D Grid |
Easy |
| 1387 |
Find Elements in a Contaminated Binary Tree |
Medium |
| 1388 |
Greatest Sum Divisible by Three |
Medium |
| 1389 |
Minimum Moves to Move a Box to Their Target Location |
Hard |
| 1390 |
Average Selling Price |
Easy |
| 1395 |
Minimum Time Visiting All Points |
Easy |
| 1396 |
Count Servers that Communicate |
Medium |
| 1397 |
Search Suggestions System |
Medium |
| 1398 |
Number of Ways to Stay in the Same Place After Some Steps |
Hard |
| 1399 |
Page Recommendations |
Medium |
| 1400 |
Find Winner on a Tic Tac Toe Game |
Easy |
| 1401 |
Number of Burgers with No Waste of Ingredients |
Medium |
| 1402 |
Count Square Submatrices with All Ones |
Medium |
| 1403 |
Palindrome Partitioning III |
Hard |
| 1404 |
Print Immutable Linked List in Reverse |
Medium |
| 1405 |
All People Report to the Given Manager |
Medium |
| 1406 |
Subtract the Product and Sum of Digits of an Integer |
Easy |
| 1407 |
Group the People Given the Group Size They Belong To |
Medium |
| 1408 |
Find the Smallest Divisor Given a Threshold |
Medium |
| 1409 |
Minimum Number of Flips to Convert Binary Matrix to Zero Matrix |
Hard |
| 1410 |
Traffic Light Controlled Intersection |
Easy |
| 1411 |
Convert Binary Number in a Linked List to Integer |
Easy |
| 1413 |
Maximum Side Length of a Square with Sum Less than or Equal to Threshold |
Medium |
| 1414 |
Shortest Path in a Grid with Obstacles Elimination |
Hard |
| 1415 |
Students and Examinations |
Easy |
| 1420 |
Find the Start and End Number of Continuous Ranges |
Medium |
| 1421 |
Find Numbers with Even Number of Digits |
Easy |
| 1422 |
Divide Array in Sets of K Consecutive Numbers |
Medium |
| 1423 |
Maximum Number of Occurrences of a Substring |
Medium |
| 1424 |
Maximum Candies You Can Get from Boxes |
Hard |
| 1425 |
Weather Type in Each Country |
Easy |
| 1426 |
Find N Unique Integers Sum up to Zero |
Easy |
| 1427 |
All Elements in Two Binary Search Trees |
Medium |
| 1428 |
Jump Game III |
Medium |
| 1429 |
Verbal Arithmetic Puzzle |
Hard |
| 1434 |
Decrypt String from Alphabet to Integer Mapping |
Easy |
| 1435 |
XOR Queries of a Subarray |
Medium |
| 1436 |
Get Watched Videos by Your Friends |
Medium |
| 1437 |
Minimum Insertion Steps to Make a String Palindrome |
Hard |
| 1438 |
Find the Team Size |
Easy |
| 1439 |
Running Total for Different Genders |
Medium |
| 1440 |
Convert Integer to the Sum of Two No-Zero Integers |
Easy |
| 1441 |
Minimum Flips to Make a OR b Equal to c |
Medium |
| 1442 |
Number of Operations to Make Network Connected |
Medium |
| 1443 |
Minimum Distance to Type a Word Using Two Fingers |
Hard |
| 1444 |
Number of Steps to Reduce a Number to Zero |
Easy |
| 1445 |
Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold |
Medium |
| 1446 |
Angle Between Hands of a Clock |
Medium |
| 1447 |
Jump Game IV |
Hard |
| 1448 |
Maximum 69 Number |
Easy |
| 1449 |
Print Words Vertically |
Medium |
| 1450 |
Delete Leaves With a Given Value |
Medium |
| 1451 |
Minimum Number of Taps to Open to Water a Garden |
Hard |
| 1452 |
Restaurant Growth |
Medium |
| 1453 |
Ads Performance |
Easy |
| 1454 |
Remove Palindromic Subsequences |
Easy |
| 1455 |
Filter Restaurants by Vegan-Friendly, Price and Distance |
Medium |
| 1456 |
Find the City With the Smallest Number of Neighbors at a Threshold Distance |
Medium |
| 1457 |
Minimum Difficulty of a Job Schedule |
Hard |
| 1458 |
Sort Integers by The Number of 1 Bits |
Easy |
| 1459 |
Apply Discount Every n Orders |
Medium |
| 1460 |
Number of Substrings Containing All Three Characters |
Medium |
| 1461 |
Count All Valid Pickup and Delivery Options |
Hard |
| 1462 |
List the Products Ordered in a Period |
Easy |
| 1463 |
The K Weakest Rows in a Matrix |
Easy |
| 1464 |
Reduce Array Size to The Half |
Medium |
| 1465 |
Maximum Product of Splitted Binary Tree |
Medium |
| 1466 |
Jump Game V |
Hard |
| 1467 |
Number of Transactions per Visit |
Hard |
| 1468 |
Check If N and Its Double Exist |
Easy |
| 1469 |
Minimum Number of Steps to Make Two Strings Anagram |
Medium |
| 1470 |
Tweet Counts Per Frequency |
Medium |
| 1471 |
Maximum Students Taking Exam |
Hard |
| 1472 |
Increasing Decreasing String |
Easy |
| 1473 |
Find the Longest Substring Containing Vowels in Even Counts |
Medium |
| 1474 |
Longest ZigZag Path in a Binary Tree |
Medium |
| 1475 |
Maximum Sum BST in Binary Tree |
Hard |
| 1476 |
Count Negative Numbers in a Sorted Matrix |
Easy |
| 1477 |
Product of the Last K Numbers |
Medium |
| 1478 |
Maximum Number of Events That Can Be Attended |
Medium |
| 1479 |
Construct Target Array With Multiple Sums |
Hard |
| 1480 |
Movie Rating |
Medium |
| 1481 |
Students With Invalid Departments |
Easy |
| 1482 |
How Many Numbers Are Smaller Than the Current Number |
Easy |
| 1483 |
Rank Teams by Votes |
Medium |
| 1484 |
Linked List in Binary Tree |
Medium |
| 1485 |
Minimum Cost to Make at Least One Valid Path in a Grid |
Hard |
| 1490 |
Generate a String With Characters That Have Odd Counts |
Easy |
| 1491 |
Bulb Switcher III |
Medium |
| 1492 |
Time Needed to Inform All Employees |
Medium |
| 1493 |
Frog Position After T Seconds |
Hard |
| 1494 |
Activity Participants |
Medium |
| 1495 |
Number of Trusted Contacts of a Customer |
Medium |
| 1496 |
Lucky Numbers in a Matrix |
Easy |
| 1497 |
Design a Stack With Increment Operation |
Medium |
| 1498 |
Find a Corresponding Node of a Binary Tree in a Clone of That Tree |
Medium |
| 1499 |
Maximum Performance of a Team |
Hard |
| 1504 |
Get the Second Most Recent Activity |
Hard |
| 1509 |
Replace Employee ID With The Unique Identifier |
Easy |