| 5. Longest Palindromic Substring | Solution | Solve | Medium | - | |
| 7. Reverse Integer | Solution | Solve | Medium | - | |
| 10. Regular Expression Matching | Solution | Solve | Hard | - | |
| 17. Letter Combinations of a Phone Number | Solution | Solve | Medium | - | |
| 39. Combination Sum | Solution | Solve | Medium | - | |
| 40. Combination Sum II | Solution | Solve | Medium | - | |
| 43. Multiply Strings | Solution | Solve | Medium | - | |
| 45. Jump Game II | Solution | Solve | Medium | - | |
| 46. Permutations | Solution | Solve | Medium | - | |
| 48. Rotate Image | Solution | Solve | Medium | - | |
| 50. Pow(x, n) | Solution | Solve | Medium | - | |
| 51. N-Queens | Solution | Solve | Hard | - | |
| 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 | - | |
| 62. Unique Paths | Solution | Solve | Medium | - | |
| 66. Plus One | Solution | Solve | Easy | - | |
| 70. Climbing Stairs | Solution | Solve | Easy | - | |
| 72. Edit Distance | Solution | Solve | Medium | - | |
| 73. Set Matrix Zeroes | Solution | Solve | Medium | - | |
| 78. Subsets | Solution | Solve | Medium | - | |
| 79. Word Search | Solution | Solve | Medium | - | |
| 90. Subsets II | Solution | Solve | Medium | - | |
| 91. Decode Ways | Solution | Solve | Medium | - | |
| 97. Interleaving String | Solution | Solve | Medium | - | |
| 115. Distinct Subsequences | Solution | Solve | Hard | - | |
| 127. Word Ladder | Solution | Solve | Hard | - | |
| 130. Surrounded Regions | Solution | Solve | Medium | - | |
| 131. Palindrome Partitioning | Solution | Solve | Medium | - | |
| 133. Clone Graph | Solution | Solve | Medium | - | |
| 134. Gas Station | Solution | Solve | Medium | - | |
| 136. Single Number | Solution | Solve | Easy | - | |
| 139. Word Break | Solution | Solve | Medium | - | |
| 152. Maximum Product Subarray | Solution | Solve | Medium | - | |
| 190. Reverse Bits | Solution | Solve | Easy | - | |
| 191. Number of 1 Bits | Solution | Solve | Easy | - | |
| 198. House Robber | Solution | Solve | Medium | - | |
| 200. Number of Islands | Solution | Solve | Medium | - | |
| 202. Happy Number | Solution | Solve | Easy | - | |
| 207. Course Schedule | Solution | Solve | Medium | - | |
| 210. Course Schedule II | Solution | Solve | Medium | - | |
| 213. House Robber II | Solution | Solve | Medium | - | |
| 215. Kth Largest Element in an Array | Solution | Solve | Medium | - | |
| 252. Meeting Rooms | Solution | Solve | Easy | - | |
| 253. Meeting Rooms II | Solution | Solve | Medium | - | |
| 261. Graph Valid Tree | Solution | Solve | Medium | - | |
| 268. Missing Number | Solution | Solve | Easy | - | |
| 269. Alien Dictionary | Solution | Solve | Hard | - | |
| 286. Walls and Gates | Solution | Solve | Medium | - | |
| 295. Find Median from Data Stream | Solution | Solve | Hard | - | |
| 300. Longest Increasing Subsequence | Solution | Solve | Medium | - | |
| 309. Best Time to Buy and Sell Stock with Cooldown | Solution | Solve | Medium | - | |
| 312. Burst Balloons | Solution | Solve | Hard | - | |
| 322. Coin Change | Solution | Solve | Medium | - | |
| 323. Number of Connected Components in an Undirected Graph | Solution | Solve | Medium | - | |
| 329. Longest Increasing Path in a Matrix | Solution | Solve | Hard | - | |
| 332. Reconstruct Itinerary | Solution | Solve | Hard | - | |
| 338. Counting Bits | Solution | Solve | Easy | - | |
| 355. Design Twitter | Solution | Solve | Medium | - | |
| 371. Sum of Two Integers | Solution | Solve | Medium | - | |
| 416. Partition Equal Subset Sum | Solution | Solve | Medium | - | |
| 417. Pacific Atlantic Water Flow | Solution | Solve | Medium | - | |
| 435. Non-overlapping Intervals | Solution | Solve | Medium | - | |
| 494. Target Sum | Solution | Solve | Medium | - | |
| 518. Coin Change II | Solution | Solve | Medium | - | |
| 621. Task Scheduler | Solution | Solve | Medium | - | |
| 647. Palindromic Substrings | Solution | Solve | Medium | - | |
| 678. Valid Parenthesis String | Solution | Solve | Medium | - | |
| 684. Redundant Connection | Solution | Solve | Medium | - | |
| 695. Max Area of Island | Solution | Solve | Medium | - | |
| 743. Network Delay Time | Solution | Solve | Medium | - | |
| 746. Min Cost Climbing Stairs | Solution | Solve | Easy | - | |
| 763. Partition Labels | Solution | Solve | Medium | - | |
| 778. Swim in Rising Water | Solution | Solve | Hard | - | |
| 787. Cheapest Flights Within K Stops | Solution | Solve | Medium | - | |
| 846. Hand of Straights | Solution | Solve | Medium | - | |
| 973. K Closest Points to Origin | Solution | Solve | Medium | - | |
| 994. Rotting Oranges | Solution | Solve | Medium | - | |
| 1046. Last Stone Weight | Solution | Solve | Easy | - | |
| 1143. Longest Common Subsequence | Solution | Solve | Medium | - | |
| 1584. Min Cost to Connect All Points | Solution | Solve | Medium | - | |
| 1851. Minimum Interval to Include Each Query | Solution | Solve | Hard | - | |
| 1899. Merge Triplets to Form Target Triplet | Solution | Solve | Medium | - | |
| 2013. Detect Squares | Solution | Solve | Medium | - | |
| 1. Two Sum | Solution | Solve | Easy | - | |
| 2. Add Two Numbers | Solution | Solve | Medium | - | |
| 3. Longest Substring Without Repeating Characters | Solution | Solve | Medium | - | |
| 4. Median of Two Sorted Arrays | Solution | Solve | Hard | - | |
| 11. Container With Most Water | Solution | Solve | Medium | - | |
| 15. 3Sum | Solution | Solve | Medium | - | |
| 19. Remove Nth Node From End of List | Solution | Solve | Medium | - | |
| 20. Valid Parentheses | Solution | Solve | Easy | - | |
| 21. Merge Two Sorted Lists | Solution | Solve | Easy | - | |
| 22. Generate Parentheses | Solution | Solve | Medium | - | |
| 23. Merge k Sorted Lists | Solution | Solve | Hard | - | |
| 25. Reverse Nodes in k-Group | Solution | Solve | Hard | - | |
| 33. Search in Rotated Sorted Array | Solution | Solve | Medium | - | |
| 36. Valid Sudoku | Solution | Solve | Medium | - | |
