| 1. Two Sum | Solution | Solve | Easy | | |
| 2. Add Two Numbers | Solution | Solve | Medium | | |
| 4. Median of Two Sorted Arrays | Solution | Solve | Hard | | |
| 5. Longest Palindromic Substring | Solution | Solve | Medium | | |
| 9. Palindrome Number | Solution | Solve | Easy | | |
| 14. Longest Common Prefix | Solution | Solve | Easy | | |
| 15. 3Sum | Solution | Solve | Medium | | |
| 20. Valid Parentheses | Solution | Solve | Easy | | |
| 22. Generate Parentheses | Solution | Solve | Medium | | |
| 23. Merge k Sorted Lists | Solution | Solve | Hard | | |
| 29. Divide Two Integers | Solution | Solve | Medium | | |
| 30. Substring with Concatenation of All Words | Solution | Solve | Hard | | |
| 31. Next Permutation | Solution | Solve | Medium | | |
| 33. Search in Rotated Sorted Array | Solution | Solve | Medium | | |
| 42. Trapping Rain Water | Solution | Solve | Hard | | |
| 45. Jump Game II | Solution | Solve | Medium | | |
| 46. Permutations | Solution | Solve | Medium | | |
| 48. Rotate Image | Solution | Solve | Medium | | |
| 53. Maximum Subarray | Solution | Solve | Medium | | |
| 56. Merge Intervals | Solution | Solve | Medium | | |
| 72. Edit Distance | Solution | Solve | Medium | | |
| 75. Sort Colors | Solution | Solve | Medium | | |
| 79. Word Search | Solution | Solve | Medium | | |
| 88. Merge Sorted Array | Solution | Solve | Easy | | |
| 108. Convert Sorted Array to Binary Search Tree | Solution | Solve | Easy | | |
| 121. Best Time to Buy and Sell Stock | Solution | Solve | Easy | | |
| 127. Word Ladder | Solution | Solve | Hard | | |
| 141. Linked List Cycle | Solution | Solve | Easy | | |
| 146. LRU Cache | Solution | Solve | Medium | | |
| 160. Intersection of Two Linked Lists | Solution | Solve | Easy | | |
| 162. Find Peak Element | Solution | Solve | Medium | | |
| 189. Rotate Array | Solution | Solve | Medium | | |
| 200. Number of Islands | Solution | Solve | Medium | | |
| 253. Meeting Rooms II | Solution | Solve | Medium | | |
| 283. Move Zeroes | Solution | Solve | Easy | | |
| 295. Find Median from Data Stream | Solution | Solve | Hard | | |
| 300. Longest Increasing Subsequence | Solution | Solve | Medium | | |
| 312. Burst Balloons | Solution | Solve | Hard | | |
| 322. Coin Change | Solution | Solve | Medium | | |
| 374. Guess Number Higher or Lower | Solution | Solve | Easy | | |
| 402. Remove K Digits | Solution | Solve | Medium | | |
| 407. Trapping Rain Water II | Solution | Solve | Hard | | |
| 410. Split Array Largest Sum | Solution | Solve | Hard | | |
| 653. Two Sum IV - Input is a BST | Solution | Solve | Easy | | |
| 713. Subarray Product Less Than K | Solution | Solve | Medium | | |
| 785. Is Graph Bipartite? | Solution | Solve | Medium | | |
| 849. Maximize Distance to Closest Person | Solution | Solve | Medium | | |
| 855. Exam Room | Solution | Solve | Medium | | |
| 886. Possible Bipartition | Solution | Solve | Medium | | |
| 987. Vertical Order Traversal of a Binary Tree | Solution | Solve | Hard | | |
