| 554 | Brick Wall | Medium |
| 560 | Subarray Sum Equals K | Medium |
| 567 | Permutation in String | Medium |
| 575 | Distribute Candies | Easy |
| 594 | Longest Harmonious Subsequence | Easy |
| 599 | Minimum Index Sum of Two Lists | Easy |
| 609 | Find Duplicate File in System | Medium |
| 621 | Task Scheduler | Medium |
| 632 | Smallest Range Covering Elements from K Lists | Hard |
| 645 | Set Mismatch | Easy |
| 648 | Replace Words | Medium |
| 652 | Find Duplicate Subtrees | Medium |
| 653 | Two Sum IV - Input is a BST | Easy |
| 659 | Split Array into Consecutive Subsequences | Medium |
| 676 | Implement Magic Dictionary | Medium |
| 677 | Map Sum Pairs | Medium |
| 690 | Employee Importance | Medium |
| 692 | Top K Frequent Words | Medium |
| 697 | Degree of an Array | Easy |
| 705 | Design HashSet | Easy |
| 706 | Design HashMap | Easy |
| 710 | Random Pick with Blacklist | Hard |
| 720 | Longest Word in Dictionary | Medium |
| 726 | Number of Atoms | Hard |
| 729 | My Calendar I | Medium |
| 736 | Parse Lisp Expression | Hard |
| 740 | Delete and Earn | Medium |
| 745 | Prefix and Suffix Search | Hard |
| 748 | Shortest Completing Word | Medium |
| 752 | Open the Lock | Medium |