| 3. Longest Substring Without Repeating Characters | Solution | Solve | Medium | | |
| 6. Zigzag Conversion | Solution | Solve | Medium | | |
| 15. 3Sum | Solution | Solve | Medium | | |
| 22. Generate Parentheses | Solution | Solve | Medium | | |
| 31. Next Permutation | Solution | Solve | Medium | | |
| 49. Group Anagrams | Solution | Solve | Medium | | |
| 54. Spiral Matrix | Solution | Solve | Medium | | |
| 56. Merge Intervals | Solution | Solve | Medium | | |
| 91. Decode Ways | Solution | Solve | Medium | | |
| 139. Word Break | Solution | Solve | Medium | | |
| 146. LRU Cache | Solution | Solve | Medium | | |
| 155. Min Stack | Solution | Solve | Medium | | |
| 198. House Robber | Solution | Solve | Medium | | |
| 207. Course Schedule | Solution | Solve | Medium | | |
| 210. Course Schedule II | Solution | Solve | Medium | | |
| 215. Kth Largest Element in an Array | Solution | Solve | Medium | | |
| 236. Lowest Common Ancestor of a Binary Tree | Solution | Solve | Medium | | |
| 238. Product of Array Except Self | Solution | Solve | Medium | | |
| 300. Longest Increasing Subsequence | Solution | Solve | Medium | | |
| 322. Coin Change | Solution | Solve | Medium | | |
| 347. Top K Frequent Elements | Solution | Solve | Medium | | |
| 380. Insert Delete GetRandom O(1) | Solution | Solve | Medium | | |
| 394. Decode String | Solution | Solve | Medium | | |
| 443. String Compression | Solution | Solve | Medium | | |
| 456. 132 Pattern | Solution | Solve | Medium | | |
| 503. Next Greater Element II | Solution | Solve | Medium | | |
| 622. Design Circular Queue | Solution | Solve | Medium | | |
| 647. Palindromic Substrings | Solution | Solve | Medium | | |
| 673. Number of Longest Increasing Subsequence | Solution | Solve | Medium | | |
| 678. Valid Parenthesis String | Solution | Solve | Medium | | |
| 695. Max Area of Island | Solution | Solve | Medium | | |
| 739. Daily Temperatures | Solution | Solve | Medium | | |
| 787. Cheapest Flights Within K Stops | Solution | Solve | Medium | | |
| 983. Minimum Cost For Tickets | Solution | Solve | Medium | | |
| 994. Rotting Oranges | Solution | Solve | Medium | | |
| 1091. Shortest Path in Binary Matrix | Solution | Solve | Medium | | |
| 1319. Number of Operations to Make Network Connected | Solution | Solve | Medium | | |
| 1647. Minimum Deletions to Make Character Frequencies Unique | Solution | Solve | Medium | | |
| 1698. Number of Distinct Substrings in a String | Solution | Solve | Medium | | |
| 1760. Minimum Limit of Balls in a Bag | Solution | Solve | Medium | | |
| 2453. Destroy Sequential Targets | Solution | Solve | Medium | | |
| 2467. Most Profitable Path in a Tree | Solution | Solve | Medium | | |
| 2489. Number of Substrings With Fixed Ratio | Solution | Solve | Medium | | |
| 2915. Length of the Longest Subsequence That Sums to Target | Solution | Solve | Medium | | |
| 3148. Maximum Difference Score in a Grid | Solution | Solve | Medium | | |
| 3719. Longest Balanced Subarray I | Solution | Solve | Medium | | |
| 3619. Count Islands With Total Value Divisible by K | Solution | Solve | Medium | | |
