| 3. Longest Substring Without Repeating Characters | Solution | Solve | Medium | | |
| 6. Zigzag Conversion | Solution | Solve | Medium | | |
| 11. Container With Most Water | Solution | Solve | Medium | | |
| 15. 3Sum | Solution | Solve | Medium | | |
| 24. Swap Nodes in Pairs | Solution | Solve | Medium | | |
| 33. Search in Rotated Sorted Array | Solution | Solve | Medium | | |
| 34. Find First and Last Position of Element in Sorted Array | Solution | Solve | Medium | | |
| 36. Valid Sudoku | Solution | Solve | Medium | | |
| 48. Rotate Image | 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 | | |
| 73. Set Matrix Zeroes | Solution | Solve | Medium | | |
| 75. Sort Colors | Solution | Solve | Medium | | |
| 78. Subsets | Solution | Solve | Medium | | |
| 79. Word Search | Solution | Solve | Medium | | |
| 128. Longest Consecutive Sequence | Solution | Solve | Medium | | |
| 146. LRU Cache | Solution | Solve | Medium | | |
| 152. Maximum Product Subarray | Solution | Solve | Medium | | |
| 162. Find Peak Element | Solution | Solve | Medium | | |
| 198. House Robber | Solution | Solve | Medium | | |
| 200. Number of Islands | Solution | Solve | Medium | | |
| 207. Course Schedule | Solution | Solve | Medium | | |
| 215. Kth Largest Element in an Array | Solution | Solve | Medium | | |
| 221. Maximal Square | Solution | Solve | Medium | | |
| 238. Product of Array Except Self | Solution | Solve | Medium | | |
| 240. Search a 2D Matrix II | Solution | Solve | Medium | | |
| 259. 3Sum Smaller | Solution | Solve | Medium | | |
| 300. Longest Increasing Subsequence | Solution | Solve | Medium | | |
| 322. Coin Change | Solution | Solve | Medium | | |
| 347. Top K Frequent Elements | Solution | Solve | Medium | | |
| 355. Design Twitter | Solution | Solve | Medium | | |
| 402. Remove K Digits | Solution | Solve | Medium | | |
| 528. Random Pick with Weight | Solution | Solve | Medium | | |
| 560. Subarray Sum Equals K | Solution | Solve | Medium | | |
| 647. Palindromic Substrings | Solution | Solve | Medium | | |
| 692. Top K Frequent Words | Solution | Solve | Medium | | |
| 735. Asteroid Collision | Solution | Solve | Medium | | |
| 851. Loud and Rich | Solution | Solve | Medium | | |
| 875. Koko Eating Bananas | Solution | Solve | Medium | | |
| 945. Minimum Increment to Make Array Unique | Solution | Solve | Medium | | |
| 994. Rotting Oranges | Solution | Solve | Medium | | |
| 1010. Pairs of Songs With Total Durations Divisible by 60 | Solution | Solve | Medium | | |
| 1048. Longest String Chain | Solution | Solve | Medium | | |
| 1060. Missing Element in Sorted Array | Solution | Solve | Medium | | |
| 1202. Smallest String With Swaps | Solution | Solve | Medium | | |
| 1209. Remove All Adjacent Duplicates in String II | Solution | Solve | Medium | | |
