- 1. Two Sum
- 2. Add Two Numbers
- 3. Longest Substring Without Repeating Characters
- 5. Longest Palindromic Substring
- 7. Reverse Integer
- 8. String to Integer (atoi)
- 11. Container With Most Water
- 13. Roman to Integer
- 14. Longest Common Prefix
- 15. 3Sum
- 17. Letter Combinations of a Phone Number
- 20. Valid Parentheses
- 21. Merge Two Sorted List
- 22. Generate Parentheses
- 26. Remove Duplicates from Sorted Array
- 28. Find the Index of the First Occurrence in a String
- 29. Divide Two Integers
- 33. Search in Rotated Sorted Array
- 34. Find First and Last Position of Element in Sorted Array
- 36. Valid Sudoku
- 38. Count and Say
- 46. Permutations
- 48. Rotate Image
- 49. Group Anagrams
- 50. Pow(x, n)
- 53. Maximum Subarray
- 54. Spiral Matrix
- 55. Jump Game
- 56. Merge Intervals
- 62. Unique Paths
- 66. Plus One
- 69. Sqrt(x)
- 70. Climbing Stairs
- 73. Set Matrix Zeroes
- 75. Sort Colors
- 78. Subsets
- 88. Merge Sorted Array
- 91. Decode Ways
- 94. Binary Tree Inorder Traversal
- 98. Validate Binary Search Tree
- 101. Symmetric Tree
- 102. Binary Tree Level Order Traversal
- 103. Binary Tree Zigzag Level Order Traversal
- 104. Maximum Depth of Binary Tree
- 105. Construct Binary Tree from Preorder and Inorder Traversal
- 108. Convert Sorted Array to Binary Search Tree
- 116. Populating Next Right Pointers in Each Node
- 118. Pascal's Triangle
- 121. Best Time to Buy and Sell Stock
- 122. Best Time to Buy and Sell Stock II
- 125. Valid Palindrome
- 128. Longest Consecutive Sequence
- 129. Sum Root to Leaf Number
- 130. Surrounded Regions
- 131. Palindrome Partitioning
- 136. Single Number
- 141. Linked List Cycle
- 165. Compare Version Numbers
- 169. Majority Element
- 171. Excel Sheet Column Number
- 190. Reverse Bits
- 191. Number of 1 Bits
- 200. Number of Islands
- 202. Happy Number
- 206. Reverse Linked List
- 217. Contains Duplicates
- 234. Palindrome Linked List
- 237. Delete Node in a Linked List
- 242. Valid Anagram
- 260. Single Number II
- 268. Missing Number
- 283. Move Zeros
- 310. Minimum Height Trees
- 326. Power of Three
- 344. Reverse String
- 350. Intersection of Two Arrays II
- 387. First Unique Character in a String
- 409. Longest Palindrome
- 417. Fizz Buzz
- 463. Island Perimeter
- 506. Relative Ranks
- 514. Freedom Trail
- 623. Add One Row to Tree
- 752. Open the Lock
- 786. K-th Smallest Prime Fraction
- 834. Sum of Distances in Tree
- 857. Minimum Cost to Hire K Workers
- 881. Boats to Save People
- 974. Subarray Sums Divisible by K
- 979. Distribute Coins in Binary Tree
- 988. Smallest String Starting From Leaf
- 1137. N-th Tribonacci Number
- 1219. Path with Maximum Gold
- 1289. Minimum Falling Path Sum II
- 1325. Delete Leaves With a Given Value
- 1509. Minimum Difference Between Largest and Smallest Value in Three Moves
- 1608. Special Array With X Elements Greater Than or Equal X
- 1863. Sum of All Subset XOR Totals
- 1915. Number of Wonderful Substrings
- 1971. Find if Path Exists in Graph
- 1992. Find All Groups of Farmland
- 2000. Reverse Prefix of Word
- 2181. Merge Nodes in Between Zeros
- 2331. Evaluate Boolean Binary Tree
- 2370. Longest Ideal Subsequence
- 2373. Largest Local Values in a Matrix
- 2441. Largest Positive Integer That Exists With Its Negative
- 2487. Remove Nodes From Linked List
- 2597. The Number of Beautiful Subsets
- 2812. Find the Safest Path in a Grid
- 2816. Double a Number Represented as a Linked List
- 2997. Minimum Number of Operations to Make Array XOR Equal to K
- 3068. Find the Maximum Sum of Node Values
- 3075. Maximize Happiness of Selected Children
- 3110. Score of a String
- 1. Middle Element
- 2. Cheapest Path
- 3. Path with Maximum Weight
- 4. Horse Step
- 5. Cafe
- 6. Longest Common Sequence
- 7. Find in Depth
- 8. Components of Connectivity
- 9. Rewrite
- 10. Topological Sort
- 11. Find Cycle
- 12. Shortest Path
- 13. Path In Graph
- 14. Blohi
- 15. Steleolog Path
- 16. Metro
- 17. Transport Line
- 422. Two Teams
- 423. Closest Stop
- 437. Max Square
- 438. Crystall
- 439. Twice Letters