| 720 | Longest Word in Dictionary | Medium |
| 721 | Accounts Merge | Medium |
| 722 | Remove Comments | Medium |
| 726 | Number of Atoms | Hard |
| 730 | Count Different Palindromic Subsequences | Hard |
| 736 | Parse Lisp Expression | Hard |
| 745 | Prefix and Suffix Search | Hard |
| 752 | Open the Lock | Medium |
| 761 | Special Binary String | Hard |
| 763 | Partition Labels | Medium |
| 767 | Reorganize String | Medium |
| 770 | Basic Calculator IV | Hard |
| 771 | Jewels and Stones | Easy |
| 777 | Swap Adjacent in LR String | Medium |
| 784 | Letter Case Permutation | Medium |
| 791 | Custom Sort String | Medium |
| 792 | Number of Matching Subsequences | Medium |
| 794 | Valid Tic-Tac-Toe State | Medium |
| 796 | Rotate String | Easy |
| 804 | Unique Morse Code Words | Easy |
| 806 | Number of Lines To Write String | Easy |
| 809 | Expressive Words | Medium |
| 811 | Subdomain Visit Count | Medium |
| 816 | Ambiguous Coordinates | Medium |
| 819 | Most Common Word | Easy |
| 820 | Short Encoding of Words | Medium |
| 821 | Shortest Distance to a Character | Easy |
| 824 | Goat Latin | Easy |
| 828 | Count Unique Characters of All Substrings of a Given String | Hard |
| 830 | Positions of Large Groups | Easy |