| 1614 | Maximum Nesting Depth of the Parentheses | Easy |
| 1616 | Split Two Strings to Make Palindrome | Medium |
| 1624 | Largest Substring Between Two Equal Characters | Easy |
| 1625 | Lexicographically Smallest String After Applying Operations | Medium |
| 1629 | Slowest Key | Easy |
| 1638 | Count Substrings That Differ by One Character | Medium |
| 1639 | Number of Ways to Form a Target String Given a Dictionary | Hard |
| 1647 | Minimum Deletions to Make Character Frequencies Unique | Medium |
| 1653 | Minimum Deletions to Make String Balanced | Medium |
| 1657 | Determine if Two Strings Are Close | Medium |
| 1662 | Check If Two String Arrays are Equivalent | Easy |
| 1663 | Smallest String With A Given Numeric Value | Medium |
| 1668 | Maximum Repeating Substring | Easy |
| 1672 | Richest Customer Wealth | Easy |
| 1678 | Goal Parser Interpretation | Easy |
| 1684 | Count the Number of Consistent Strings | Easy |
| 1689 | Partitioning Into Minimum Number Of Deci-Binary Numbers | Medium |
| 1694 | Reformat Phone Number | Easy |
| 1702 | Maximum Binary String After Change | Medium |
| 1704 | Determine if String Halves Are Alike | Easy |
| 1717 | Maximum Score From Removing Substrings | Medium |
| 1736 | Latest Time by Replacing Hidden Digits | Easy |
| 1737 | Change Minimum Characters to Satisfy One of Three Conditions | Medium |
| 1745 | Palindrome Partitioning IV | Hard |
| 1750 | Minimum Length of String After Deleting Similar Ends | Medium |
| 1754 | Largest Merge Of Two Strings | Medium |
| 1758 | Minimum Changes To Make Alternating Binary String | Easy |
| 1759 | Count Number of Homogenous Substrings | Medium |
| 1763 | Longest Nice Substring | Easy |
| 1768 | Merge Strings Alternately | Easy |