| 15. 3Sum | | | Solve | Medium | | |
| 22. Generate Parentheses | | | Solve | Medium | | |
| 31. Next Permutation | | | Solve | Medium | | |
| 33. Search in Rotated Sorted Array | | | Solve | Medium | | |
| 34. Find First and Last Position of Element in Sorted Array | | | Solve | Medium | | |
| 39. Combination Sum | | | Solve | Medium | | |
| 46. Permutations | | | Solve | Medium | | |
| 53. Maximum Subarray | | | Solve | Medium | | |
| 56. Merge Intervals | | | Solve | Medium | | |
| 62. Unique Paths | | | Solve | Medium | | |
| 93. Restore IP Addresses | | | Solve | Medium | | |
| 105. Construct Binary Tree from Preorder and Inorder Traversal | | | Solve | Medium | | |
| 122. Best Time to Buy and Sell Stock II | | | Solve | Medium | | |
| 139. Word Break | | | Solve | Medium | | |
| 146. LRU Cache | | | Solve | Medium | | |
| 148. Sort List | | | Solve | Medium | | |
| 200. Number of Islands | | | Solve | Medium | | |
| 208. Implement Trie (Prefix Tree) | | | Solve | Medium | | |
| 210. Course Schedule II | | | Solve | Medium | | |
| 215. Kth Largest Element in an Array | | | Solve | Medium | | |
| 221. Maximal Square | | | Solve | Medium | | |
| 227. Basic Calculator II | | | Solve | Medium | | |
| 300. Longest Increasing Subsequence | | | Solve | Medium | | |
| 378. Kth Smallest Element in a Sorted Matrix | | | Solve | Medium | | |
| 386. Lexicographical Numbers | | | Solve | Medium | | |
| 394. Decode String | | | Solve | Medium | | |
| 445. Add Two Numbers II | | | Solve | Medium | | |
| 490. The Maze | | | Solve | Medium | | |
| 505. The Maze II | | | Solve | Medium | | |
| 518. Coin Change II | | | Solve | Medium | | |
| 523. Continuous Subarray Sum | | | Solve | Medium | | |
| 542. 01 Matrix | | | Solve | Medium | | |
| 567. Permutation in String | | | Solve | Medium | | |
| 670. Maximum Swap | | | Solve | Medium | | |
| 722. Remove Comments | | | Solve | Medium | | |
| 752. Open the Lock | | | Solve | Medium | | |
| 886. Possible Bipartition | | | Solve | Medium | | |
| 1004. Max Consecutive Ones III | | | Solve | Medium | | |
| 1031. Maximum Sum of Two Non-Overlapping Subarrays | | | Solve | Medium | | |
| 1081. Smallest Subsequence of Distinct Characters | | | Solve | Medium | | |
| 1155. Number of Dice Rolls With Target Sum | | | Solve | Medium | | |
| 1530. Number of Good Leaf Nodes Pairs | | | Solve | Medium | | |
| 1774. Closest Dessert Cost | | | Solve | Medium | | |
| 1824. Minimum Sideway Jumps | | | Solve | Medium | | |
| 1927. Sum Game | | | Solve | Medium | | |
| 1996. The Number of Weak Characters in the Game | | | Solve | Medium | | |
| 1997. First Day Where You Have Been in All the Rooms | | | Solve | Medium | | |
| 2420. Find All Good Indices | | | Solve | Medium | | |
