| 3. Longest Substring Without Repeating Characters | Solution | Solve | Medium | | |
| 5. Longest Palindromic Substring | Solution | Solve | Medium | | |
| 11. Container With Most Water | Solution | Solve | Medium | | |
| 15. 3Sum | Solution | Solve | Medium | | |
| 17. Letter Combinations of a Phone Number | Solution | Solve | Medium | | |
| 33. Search in Rotated Sorted Array | 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 | | |
| 56. Merge Intervals | Solution | Solve | Medium | | |
| 62. Unique Paths | Solution | Solve | Medium | | |
| 71. Simplify Path | Solution | Solve | Medium | | |
| 72. Edit Distance | Solution | Solve | Medium | | |
| 75. Sort Colors | Solution | Solve | Medium | | |
| 79. Word Search | Solution | Solve | Medium | | |
| 93. Restore IP Addresses | Solution | Solve | Medium | | |
| 122. Best Time to Buy and Sell Stock II | Solution | Solve | Medium | | |
| 128. Longest Consecutive Sequence | Solution | Solve | Medium | | |
| 129. Sum Root to Leaf Numbers | Solution | Solve | Medium | | |
| 134. Gas Station | Solution | Solve | Medium | | |
| 146. LRU Cache | Solution | Solve | Medium | | |
| 151. Reverse Words in a String | Solution | Solve | Medium | | |
| 162. Find Peak Element | Solution | Solve | Medium | | |
| 167. Two Sum II - Input Array Is Sorted | Solution | Solve | Medium | | |
| 179. Largest Number | Solution | Solve | Medium | | |
| 189. Rotate Array | Solution | Solve | Medium | | |
| 199. Binary Tree Right Side View | Solution | Solve | Medium | | |
| 200. Number of Islands | Solution | Solve | Medium | | |
| 207. Course Schedule | Solution | Solve | Medium | | |
| 213. House Robber II | Solution | Solve | Medium | | |
| 215. Kth Largest Element in an Array | Solution | Solve | Medium | | |
| 238. Product of Array Except Self | Solution | Solve | Medium | | |
| 264. Ugly Number II | Solution | Solve | Medium | | |
| 286. Walls and Gates | Solution | Solve | Medium | | |
| 300. Longest Increasing Subsequence | Solution | Solve | Medium | | |
| 347. Top K Frequent Elements | Solution | Solve | Medium | | |
| 416. Partition Equal Subset Sum | Solution | Solve | Medium | | |
| 451. Sort Characters By Frequency | Solution | Solve | Medium | | |
| 503. Next Greater Element II | Solution | Solve | Medium | | |
| 539. Minimum Time Difference | Solution | Solve | Medium | | |
| 560. Subarray Sum Equals K | Solution | Solve | Medium | | |
| 723. Candy Crush | Solution | Solve | Medium | | |
| 739. Daily Temperatures | Solution | Solve | Medium | | |
| 792. Number of Matching Subsequences | Solution | Solve | Medium | | |
| 931. Minimum Falling Path Sum | Solution | Solve | Medium | | |
| 974. Subarray Sums Divisible by K | Solution | Solve | Medium | | |
| 994. Rotting Oranges | Solution | Solve | Medium | | |
| 1314. Matrix Block Sum | Solution | Solve | Medium | | |
| 1353. Maximum Number of Events That Can Be Attended | Solution | Solve | Medium | | |
