| 1143 | Longest Common Subsequence | Medium |
| 1160 | Find Words That Can Be Formed by Characters | Easy |
| 1239 | Maximum Length of a Concatenated String with Unique Characters | Medium |
| 1341 | Split a String in Balanced Strings | Easy |
| 1347 | Minimum Number of Steps to Make Two Strings Anagram | Medium |
| 1422 | Maximum Score After Splitting a String | Easy |
| 1436 | Destination City | Easy |
| 1456 | Maximum Number of Vowels in a Substring of Given Length | Medium |
| 1496 | Path Crossing | Easy |
| 1531 | String Compression II | Hard |
| 1544 | Make The String Great | Easy |
| 1578 | Minimum Time to Make Rope Colorful | Medium |
| 1624 | Largest Substring Between Two Equal Characters | Easy |
| 1647 | Minimum Deletions to Make Character Frequencies Unique | Medium |
| 1653 | Minimum Deletions to Make String Balanced | Medium |
| 1662 | Check If Two String Arrays are Equivalent | Easy |
| 1704 | Determine if String Halves Are Alike | Easy |
| 1750 | Minimum Length of String After Deleting Similar Ends | Medium |
| 1759 | Count Number of Homogenous Substrings | Medium |
| 1790 | Check if One String Swap Can Make Strings Equal | Easy |
| 1897 | Redistribute Characters to Make All Strings Equal | Easy |
| 1903 | Largest Odd Number in String | Easy |
| 1930 | Unique Length-3 Palindromic Subsequences | Medium |
| 1980 | Find Unique Binary String | Medium |
| 2024 | Maximize the Confusion of an Exam | Medium |
| 2038 | Remove Colored Pieces if Both Neighbors are the Same Color | Medium |
| 2124 | Check if All A's Appears Before All B's | Easy |
| 2125 | Number of Laser Beams in a Bank | Medium |
| 2147 | Number of Ways to Divide a Long Corridor | Hard |
| 2264 | Largest 3-Same-Digit Number in String | Easy |