| 15. 3Sum | | | Solve | Medium | | |
| 16. 3Sum Closest | | | Solve | Medium | | |
| 18. 4Sum | | | Solve | Medium | | |
| 49. Group Anagrams | | | Solve | Medium | | |
| 56. Merge Intervals | | | Solve | Medium | | |
| 75. Sort Colors | | | Solve | Medium | | |
| 147. Insertion Sort List | | | Solve | Medium | | |
| 148. Sort List | | | Solve | Medium | | |
| 164. Maximum Gap | | | Solve | Medium | | |
| 179. Largest Number | | | Solve | Medium | | |
| 215. Kth Largest Element in an Array | | | Solve | Medium | | |
| 229. Majority Element II | | | Solve | Medium | | |
| 253. Meeting Rooms II | | | Solve | Medium | | |
| 259. 3Sum Smaller | | | Solve | Medium | | |
| 274. H-Index | | | Solve | Medium | | |
| 280. Wiggle Sort | | | Solve | Medium | | |
| 314. Binary Tree Vertical Order Traversal | | | Solve | Medium | | |
| 324. Wiggle Sort II | | | Solve | Medium | | |
| 347. Top K Frequent Elements | | | Solve | Medium | | |
| 360. Sort Transformed Array | | | Solve | Medium | | |
| 368. Largest Divisible Subset | | | Solve | Medium | | |
| 378. Kth Smallest Element in a Sorted Matrix | | | Solve | Medium | | |
| 406. Queue Reconstruction by Height | | | Solve | Medium | | |
| 435. Non-overlapping Intervals | | | Solve | Medium | | |
| 436. Find Right Interval | | | Solve | Medium | | |
| 451. Sort Characters By Frequency | | | Solve | Medium | | |
| 452. Minimum Number of Arrows to Burst Balloons | | | Solve | Medium | | |
| 462. Minimum Moves to Equal Array Elements II | | | Solve | Medium | | |
| 475. Heaters | | | Solve | Medium | | |
| 522. Longest Uncommon Subsequence II | | | Solve | Medium | | |
| 524. Longest Word in Dictionary through Deleting | | | Solve | Medium | | |
| 532. K-diff Pairs in an Array | | | Solve | Medium | | |
| 539. Minimum Time Difference | | | Solve | Medium | | |
| 581. Shortest Unsorted Continuous Subarray | | | Solve | Medium | | |
| 611. Valid Triangle Number | | | Solve | Medium | | |
| 621. Task Scheduler | | | Solve | Medium | | |
| 646. Maximum Length of Pair Chain | | | Solve | Medium | | |
| 658. Find K Closest Elements | | | Solve | Medium | | |
| 692. Top K Frequent Words | | | Solve | Medium | | |
| 720. Longest Word in Dictionary | | | Solve | Medium | | |
| 721. Accounts Merge | | | Solve | Medium | | |
| 767. Reorganize String | | | Solve | Medium | | |
| 769. Max Chunks To Make Sorted | | | Solve | Medium | | |
| 786. K-th Smallest Prime Fraction | | | Solve | Medium | | |
| 791. Custom Sort String | | | Solve | Medium | | |
| 792. Number of Matching Subsequences | | | Solve | Medium | | |
| 823. Binary Trees With Factors | | | Solve | Medium | | |
| 825. Friends Of Appropriate Ages | | | Solve | Medium | | |
| 826. Most Profit Assigning Work | | | Solve | Medium | | |
| 833. Find And Replace in String | | | Solve | Medium | | |
