| 1. Two Sum | Solution | Solve | Easy | | |
| 3. Longest Substring Without Repeating Characters | Solution | Solve | Medium | | |
| 15. 3Sum | Solution | Solve | Medium | | |
| 23. Merge k Sorted Lists | Solution | Solve | Hard | | |
| 24. Swap Nodes in Pairs | Solution | Solve | Medium | | |
| 33. Search in Rotated Sorted Array | Solution | Solve | Medium | | |
| 41. First Missing Positive | Solution | Solve | Hard | | |
| 42. Trapping Rain Water | Solution | Solve | Hard | | |
| 45. Jump Game II | Solution | Solve | Medium | | |
| 48. Rotate Image | Solution | Solve | Medium | | |
| 49. Group Anagrams | Solution | Solve | Medium | | |
| 54. Spiral Matrix | Solution | Solve | Medium | | |
| 56. Merge Intervals | Solution | Solve | Medium | | |
| 65. Valid Number | Solution | Solve | Hard | | |
| 73. Set Matrix Zeroes | Solution | Solve | Medium | | |
| 74. Search a 2D Matrix | Solution | Solve | Medium | | |
| 92. Reverse Linked List II | Solution | Solve | Medium | | |
| 103. Binary Tree Zigzag Level Order Traversal | Solution | Solve | Medium | | |
| 124. Binary Tree Maximum Path Sum | Solution | Solve | Hard | | |
| 126. Word Ladder II | Solution | Solve | Hard | | |
| 130. Surrounded Regions | Solution | Solve | Medium | | |
| 132. Palindrome Partitioning II | Solution | Solve | Hard | | |
| 133. Clone Graph | Solution | Solve | Medium | | |
| 139. Word Break | Solution | Solve | Medium | | |
| 146. LRU Cache | Solution | Solve | Medium | | |
| 189. Rotate Array | Solution | Solve | Medium | | |
| 200. Number of Islands | Solution | Solve | Medium | | |
| 210. Course Schedule II | Solution | Solve | Medium | | |
| 238. Product of Array Except Self | Solution | Solve | Medium | | |
| 239. Sliding Window Maximum | Solution | Solve | Hard | | |
| 253. Meeting Rooms II | Solution | Solve | Medium | | |
| 297. Serialize and Deserialize Binary Tree | Solution | Solve | Hard | | |
| 329. Longest Increasing Path in a Matrix | Solution | Solve | Hard | | |
| 334. Increasing Triplet Subsequence | Solution | Solve | Medium | | |
| 347. Top K Frequent Elements | Solution | Solve | Medium | | |
| 394. Decode String | Solution | Solve | Medium | | |
| 410. Split Array Largest Sum | Solution | Solve | Hard | | |
| 417. Pacific Atlantic Water Flow | Solution | Solve | Medium | | |
| 460. LFU Cache | Solution | Solve | Hard | | |
| 516. Longest Palindromic Subsequence | Solution | Solve | Medium | | |
| 543. Diameter of Binary Tree | Solution | Solve | Easy | | |
| 545. Boundary of Binary Tree | Solution | Solve | Medium | | |
| 605. Can Place Flowers | Solution | Solve | Easy | | |
| 621. Task Scheduler | Solution | Solve | Medium | | |
| 628. Maximum Product of Three Numbers | Solution | Solve | Easy | | |
| 716. Max Stack | Solution | Solve | Hard | | |
| 853. Car Fleet | Solution | Solve | Medium | | |
| 863. All Nodes Distance K in Binary Tree | Solution | Solve | Medium | | |
| 895. Maximum Frequency Stack | Solution | Solve | Hard | | |
| 991. Broken Calculator | Solution | Solve | Medium | | |
