| 1. Two Sum | Solution | Solve | Easy | | |
| 5. Longest Palindromic Substring | Solution | Solve | Medium | | |
| 10. Regular Expression Matching | Solution | Solve | Hard | | |
| 15. 3Sum | Solution | Solve | Medium | | |
| 17. Letter Combinations of a Phone Number | Solution | Solve | Medium | | |
| 20. Valid Parentheses | Solution | Solve | Easy | | |
| 22. Generate Parentheses | Solution | Solve | Medium | | |
| 41. First Missing Positive | Solution | Solve | Hard | | |
| 42. Trapping Rain Water | Solution | Solve | Hard | | |
| 45. Jump Game II | Solution | Solve | Medium | | |
| 49. Group Anagrams | Solution | Solve | Medium | | |
| 53. Maximum Subarray | Solution | Solve | Medium | | |
| 54. Spiral Matrix | Solution | Solve | Medium | | |
| 55. Jump Game | Solution | Solve | Medium | | |
| 56. Merge Intervals | Solution | Solve | Medium | | |
| 57. Insert Interval | Solution | Solve | Medium | | |
| 75. Sort Colors | Solution | Solve | Medium | | |
| 121. Best Time to Buy and Sell Stock | Solution | Solve | Easy | | |
| 127. Word Ladder | Solution | Solve | Hard | | |
| 128. Longest Consecutive Sequence | Solution | Solve | Medium | | |
| 134. Gas Station | Solution | Solve | Medium | | |
| 135. Candy | Solution | Solve | Hard | | |
| 138. Copy List with Random Pointer | Solution | Solve | Medium | | |
| 146. LRU Cache | Solution | Solve | Medium | | |
| 198. House Robber | Solution | Solve | Medium | | |
| 200. Number of Islands | Solution | Solve | Medium | | |
| 221. Maximal Square | Solution | Solve | Medium | | |
| 239. Sliding Window Maximum | Solution | Solve | Hard | | |
| 277. Find the Celebrity | Solution | Solve | Medium | | |
| 312. Burst Balloons | Solution | Solve | Hard | | |
| 322. Coin Change | Solution | Solve | Medium | | |
| 329. Longest Increasing Path in a Matrix | Solution | Solve | Hard | | |
| 337. House Robber III | Solution | Solve | Medium | | |
| 378. Kth Smallest Element in a Sorted Matrix | Solution | Solve | Medium | | |
| 399. Evaluate Division | Solution | Solve | Medium | | |
| 402. Remove K Digits | Solution | Solve | Medium | | |
| 406. Queue Reconstruction by Height | Solution | Solve | Medium | | |
| 410. Split Array Largest Sum | Solution | Solve | Hard | | |
| 473. Matchsticks to Square | Solution | Solve | Medium | | |
| 475. Heaters | Solution | Solve | Medium | | |
| 488. Zuma Game | Solution | Solve | Hard | | |
| 502. IPO | Solution | Solve | Hard | | |
| 514. Freedom Trail | Solution | Solve | Hard | | |
| 523. Continuous Subarray Sum | Solution | Solve | Medium | | |
| 542. 01 Matrix | Solution | Solve | Medium | | |
| 546. Remove Boxes | Solution | Solve | Hard | | |
| 621. Task Scheduler | Solution | Solve | Medium | | |
| 632. Smallest Range Covering Elements from K Lists | Solution | Solve | Hard | | |
| 639. Decode Ways II | Solution | Solve | Hard | | |
| 652. Find Duplicate Subtrees | Solution | Solve | Medium | | |
