LeetCode Algorithms


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Problems

#	Name	Solution	Youtube
1	Two Sum
7	Reverse Integer
9	PalindromeNumber
13	Roman To Integer
14	Longest Common Prefix
20	ValidParentheses
21	Merge 2 Sorted Lists
26	Remove Duplicates From Sorted Array
27	Remove Element
28	Needle in Haystack
35	Search Inserted Position
38	Count and Say
53	Maximum SubArray
58	Length of Last Word
66	Plus One
67	Add Binary
69	Sqrt(x)
70	Climbing Stairs
83	Remove Duplicates from Sorted List
88	Merge Sorted Array
94	Binary Tree Inorder Traversal
100	Same Tree
101	Symmetric Tree
104	Maximum Depth of Binary Tree
107	Binary Tree Level Order Traversal II
108	Convert Sorted Array To Binary Search Tree
110	Balanced Binary Tree
111	Minimum Depth of Binary Tree
112	Path Sum
118	Pascal's Triangle
119	Pascal's Triangle II
121	Best Time to Buy and Sell Stocks
122	Best Time to Buy and Sell Stocks II
125	Valid Palindrome
136	Single Number
141	Linked List Cycle
144	Binary Tree Preorder Traversal
145	Binary Tree Postorder Traversal
155	Min Stack
157	Read N Characters Given Read4
160	Intersection of Two Linked Lists
167	Two Sum II - Input Array is Sorted
168	Excel Sheet Column Title
169	Majority Element
170	🔒 Two Sum III - Data Structure Design
171	Excel Sheet Column Number
172	Factoring Trailing Zeroes
189	Rotate Array
190	Reverse Bits
191	Number of One Bits
198	House Robber
202	Happy Number
203	Remove Linked List Elements
204	Count Primes
205	Isomorphic Strings
206	Reverse Linked Lists
217	Contains Duplicate
219	Contains Duplicate II
225	Implement Stack using Queues
226	Invert Binary Tree
226	Summary Ranges
231	Power of Two
232	Implement Queue Using Stacks
234	Palindrome Linked Lists
235	Lowest Common Ancestor of a Binary Search Tree
237	Delete a Node In A Linked List
242	Valid Anagram
243	🔒 Shortest Word Distance
246	🔒 Strobogramatic Number
252	🔒 Meeting Rooms
256	🔒 Paint House
257	Binary Tree Paths
258	Add Digits
263	Ugly Number
266	🔒 Palindrome Permutation
268	Missing Number
270	🔒 Closest Binary Search Tree Value
276	🔒 Paint Fence
278	First Bad Version
283	Move Zeroes
290	Word Pattern
292	Nim Game
293	🔒 Flip Game
299	Bulls and Cows
303	Range Sum Query - Immutable
326	Power of Three
326	Counting Bits
339	🔒 Nested List Weight Sum
342	Power of Four
344	Reverse A String
345	Reverse Vowels of A String
346	🔒 Moving Average From Data Stream
349	Intersection of 2 Arrays
350	Intersection of 2 Arrays II
359	🔒 Logger Rate Limiter
367	Valid Perfect Square
374	Guess Number Higher or Lower
383	Ransom Note
387	First Unique Character in String
389	Find the Difference
392	Is Subsequence
401	Binary Watch
404	Sum of Left Leaves
405	Convert a Number to Hexadecimal
408	🔒 Valid Word Abbreviation
409	Longest Palindrome
412	Fizz Buzz
414	Third Maximum Number
415	Add Strings
422	🔒 Valid Word Square
434	Number of Segments in a String
441	Arranging Coins
443	String Compression
447	Number of Boomerangs
448	Find All Numbers Disappeared in an Array
453	Minimum Moves to Equal Array Elements
455	Assign Cookies
459	Repeated Substring Pattern
461	Hamming Distance
463	Island Perimeter
475	Heaters
476	Number Complement
482	License Key Formatting
485	Max Consecutive Ones
492	Construct the Rectangle
495	Teemo Attacking
496	Next Greater Element I
500	Keyboard Row
501	Find Mode in Binary Search Tree
504	Base 7
506	Relative Ranks
507	Perfect Number
509	Fibonacci Number
520	Detect Capital
521	Longest Uncommon Subsequence I
530	Minimum Absolute Difference in BST
532	K - Diff Pairs in Array
538	Convert BST to Greater Tree
541	Reverse String II
543	Diameter of Binary Tree
551	Student Attendance Record I
557	Reverse Words in a String III
559	Maximum Depth of N-Ary Tree
561	Array Partition I
563	Binary Tree Tilt
566	Reshape The Matrix
572	Subtree of Another Tree
575	Distribute Candies
581	Shortest Unsorted Continuous Subarray
589	N-Ary Tree Preorder Traversal
590	N-Ary Tree Postorder Traversal
594	Longest Harmonious Subsequence
598	Range Addition II
599	Minimum Index Sum of 2 Lists
604	🔒 Design Compressed String Iterator
605	Can Place Flowers
606	Construct String from Binary Tree
617	Merge Two Binary Trees
624	🔒 Maximum Distance in Arrays
628	Maximum Product of Three Numbers
633	Sum Square Numbers
637	Average of Levels in Binary Tree
643	Maximum Average SubArray I
645	Set Mismatch
653	Two Sum IV - Input is a BST
657	Robot Return to Origin
661	Image Smoother
665	Non Deceasing Array
669	Trim a Binary Search Tree
671	Second Minimum Node in Binary Tree
674	Longest Continuous Increasing Subsequence
680	Valid Palindrome II
682	Baseball Game
686	Repeated String Match
687	Longest Univalue Path
690	Employee Importance
693	Binary Number with Alternating Bits
696	Count Binary Substrings
697	Degree of an Array
700	Search in a Binary Search Tree
703	Kth Largest Element in a Stream
704	Binary Search
705	Design HashSet
706	Design HashMap
709	To Lower Case
716	Max Stack
717	1-bit and 2-bit Characters
720	Longest Word in Dictionary
724	Find Pivot Index
728	Self Dividing Numbers
733	Flood Fill
734	Sentence Similarity
744	Find Smallest Letter Greater Than Target
746	Min Cost Climbing Stairs
747	Largest Number at least twize of Others
748	Shortest Completing Word
758	Bold Words in String
760	Find Anagram Mappings
762	Prime Number of Set Bits in Primary Representation
766	Toeplitz Matrix
771	Jewels and Stones
783	Minimum Distance Between BST Nodes
788	Rotated Digits
796	Rotate String
800	Similar RGB Color
804	Unique Morse Code Words
806	Number of Lines to Write String
811	Subdomain Visit Count
812	Largest Triangle Area
819	Most Common Word
821	Shortest Distance to Character
824	Goat Latin
830	Positions of Large Groups
832	Flipping an Image
836	Rectangle Overlap
840	Magic Squares in Grid
844	Backspace String Compare
849	Maximize Distance to Closest Person
852	Peak Index in Mountain Array
859	Buddy Strings
860	Lemonade Change
867	Transpose Matrix
868	Binary Gap
872	Leaf-Similar Trees
874	Walking Robot Simulation
876	Middle of the Linked List
883	Projection Area of 3D Shapes
884	Uncommon Words from 2 Sentences
888	Fair Candy Swap
892	Surface Area of 3D Shapes
893	Groups of Special Equivalent Strings
896	Monotonic Array
897	Increasing Order Search Tree
905	Sort Array by Parity
908	Smallest Range I
914	X of a kind in a Deck of Cards
917	Reverse Only Letters
922	Sort Array by Parity II
925	Long Pressed Name
929	Unique Email Addresses
933	Number of Recent Calls
937	Reorder Data In Log Files
938	Range Sum of BST
941	Valid Mountain Array
942	DI String Match
944	Delete Columns to Make Sorted
949	Largest Time for Given Digits
953	Verifying an Alien Dictionary
961	N-Repeated Elements in Size 2N Array
965	Univalued Binary Tree
970	Powerful Integers
976	Largest Perimeter Triangle
977	Squares of a Sorted Array
985	Sum of Even Numbers after Queries
989	Add to Array Form of Integer
993	Cousins in Binary Tree
997	Find the Town Judge
999	Available Captures for Rook
1002	Find Common Characters
1005	Maximize Sum of Array After K Negations
1009	Complement of Base 10 Integer
1010	Pairs of Songs With Total Durations Divisible by 60
1013	Partition Array into Three Parts with equal Sum
1018	Binary Prefix Divisible by 5
1021	Remove Outermost Parenthesis
1022	Sum of Root to Leaf Binary Numbers
1025	Divisor Game
1029	Two City Scheduling
1030	Matrix Cells in Distance Order
1033	Moving Stones Until Consecutive
1037	Valid Boomerang
1042	Flower Planting with no Adjacent
1046	Last Stone Weight
1047	Remove All adjacent Duplicates in String
1051	Height Checker
1056	Confusing Number
1064	Fixed Point
1065	Index Pairs of a String
1071	Greatest Common Divisors of Strings
1078	Occurrence After Bigram
1085	Sum of Digits in Minimum Number
1086	High Five
1089	Duplicate Zeroes
1099	Two Sum Less Than K
1103	Distribute Candies to People
1108	Defanging an IP Address
1118	Number of Days in a Month
1119	Remove Vowels From String
1122	Relative Sort Array
1128	Number of Equivalent Domino Pairs
1133	Largest Unique Number
1134	Armstrong Number
1137	Nth Tribonacci Number
1150	Check if Number is Majority Element in Sorted Array
1154	Day of The Year
1160	Find Words That Can Be Formed By Characters
1165	Single Row Keyboard
1170	Compare Strings By Frequency of the Smallest Character
1175	Prime Arrangements
1176	Diet Plan Performance
1180	Count Substrings with only one Distinct Letter
1184	Distance Between Bus Stops
1185	Day of the Week
1189	Maximum Number of Balloons
1196	How Many Apples Can You Put into the Basket
1200	Minimum Absolute Difference
1207	Unique Number of Occurrences
1213	Intersection of Three Sorted Arrays
1217	Play With Chips
1221	Split A String In Balanced Strings
1228	Missing A Number In Arithmetic Progression
1232	Check If It Is A Straight Line
1237	Find Positive Integer Solutions for a Given Equation
1243	Array Transformation
1252	Cells With Odd Values In Matrix
1260	Shift 2D Grid
1266	Minimum Time Visiting All Points
1271	Hexspeak
1275	Find Winner On a Tic Tac Toe Game
1281	Subtract the Product and Sum of Digits of a Integer
1287	Element Appearing More Than 25% in Sorted Array
1290	Convert Binary Number In A Linked List to Integer
1295	Find Numbers With Even Numbers of Digits
1299	Replace Elements With Greatest Element on Right Side
1304	Find N Unique Integers Sum Up To Zero
1309	Decrypt String From Alphabet To Integer Mapping
1313	Decompress Run-Length Encoded Strings
1317	Convert Integer to Sum Of Two Non-Zero Integers
1323	Maximum 69 Number
1331	Rank Transform of An Array
1332	Remove Palindromic Subsequences
1337	The K Weakest Rows In A Matrix
1342	Number of Steps to Reduce a Number to Zero
1346	Check if N and It's Double Exist
1351	Count Negative Numbers In A Sorted Matrix
1356	Sort Integers by Number of 1 Bits
1360	Number of Days Between Two Dates
1365	How Many Numbers Are Smaller Than Current Number
1370	Increasing Decreasing String
1374	Generate A String With Characters That Have Odd Count
1380	Lucky Numbers In A Matrix
1385	Find The Distance Value Between 2 Arrays
1389	Create Target Array in Given Order
1394	Find Lucky Integer In An Array
1399	Count Largest Group
1403	Minimum Subsequence in Non-Increasing Order
1408	String Matching In An Array
1413	Minimum Value To Get Positive Step By Step Sum
1417	Reformat The String
1422	Maximum Score After Splitting A String
1426	Counting Elements
1427	Performing String Shifts
1431	Kids With The Greatest Number Of Candies
1436	Destination City
1441	Build An Array With Stack Operation
1446	Consecutive Characters
1450	Number of Students Doing Homework at Given Time
1455	Check If Word Occurs as Prefix of any Word in Sentence
1460	Make 2 Arrays Equal by Reversing Sub Arrays
1464	Maximum Product of 2 Elements in Array
1469	Find All Lonely Nodes
1470	Shuffle The Array
1474	Delete N Nodes After M Nodes In A Linked List
1475	Final Prices With Special Discount in a Shop
1480	Running Sum of 1D Array
1486	XOR Operations in An Array
1491	Average Salary Excluding the Minimum and Maximum Salary
1496	Path Crossing
1502	Can Make Arithmetic Progression From Sequence
1507	Reformat Date
1512	Number of Good Pairs
1518	Water Bottles
1523	Count Odd Numbers In Interval Range
1528	Shuffle Strings
1534	Count Good Triplets
1539	Kth Missing Positive Number
1544	Make The String Great