| 1447 | Simplified Fractions | Medium |
| 1451 | Rearrange Words in a Sentence | Medium |
| 1452 | People Whose List of Favorite Companies Is Not a Subset of Another List | Medium |
| 1455 | Check If a Word Occurs As a Prefix of Any Word in a Sentence | Easy |
| 1456 | Maximum Number of Vowels in a Substring of Given Length | Medium |
| 1461 | Check If a String Contains All Binary Codes of Size K | Medium |
| 1487 | Making File Names Unique | Medium |
| 1496 | Path Crossing | Easy |
| 1505 | Minimum Possible Integer After at Most K Adjacent Swaps On Digits | Hard |
| 1507 | Reformat Date | Easy |
| 1513 | Number of Substrings With Only 1s | Medium |
| 1520 | Maximum Number of Non-Overlapping Substrings | Hard |
| 1525 | Number of Good Ways to Split a String | Medium |
| 1528 | Shuffle String | Easy |
| 1529 | Minimum Suffix Flips | Medium |
| 1531 | String Compression II | Hard |
| 1540 | Can Convert String in K Moves | Medium |
| 1541 | Minimum Insertions to Balance a Parentheses String | Medium |
| 1542 | Find Longest Awesome Substring | Hard |
| 1544 | Make The String Great | Easy |
| 1545 | Find Kth Bit in Nth Binary String | Medium |
| 1556 | Thousand Separator | Easy |
| 1573 | Number of Ways to Split a String | Medium |
| 1576 | Replace All ?'s to Avoid Consecutive Repeating Characters | Easy |
| 1578 | Minimum Time to Make Rope Colorful | Medium |
| 1585 | Check If String Is Transformable With Substring Sort Operations | Hard |
| 1592 | Rearrange Spaces Between Words | Easy |
| 1593 | Split a String Into the Max Number of Unique Substrings | Medium |
| 1598 | Crawler Log Folder | Easy |
| 1604 | Alert Using Same Key-Card Three or More Times in a One Hour Period | Medium |