| 1616. Split Two Strings to Make Palindrome | | | Solve | Medium | | |
| 1618. Maximum Font to Fit a Sentence in a Screen | | | Solve | Medium | | |
| 1625. Lexicographically Smallest String After Applying Operations | | | Solve | Medium | | |
| 1638. Count Substrings That Differ by One Character | | | Solve | Medium | | |
| 1647. Minimum Deletions to Make Character Frequencies Unique | | | Solve | Medium | | |
| 1653. Minimum Deletions to Make String Balanced | | | Solve | Medium | | |
| 1657. Determine if Two Strings Are Close | | | Solve | Medium | | |
| 1663. Smallest String With A Given Numeric Value | | | Solve | Medium | | |
| 1682. Longest Palindromic Subsequence II | | | Solve | Medium | | |
| 1689. Partitioning Into Minimum Number Of Deci-Binary Numbers | | | Solve | Medium | | |
| 1698. Number of Distinct Substrings in a String | | | Solve | Medium | | |
| 1702. Maximum Binary String After Change | | | Solve | Medium | | |
| 1717. Maximum Score From Removing Substrings | | | Solve | Medium | | |
| 1737. Change Minimum Characters to Satisfy One of Three Conditions | | | Solve | Medium | | |
| 1750. Minimum Length of String After Deleting Similar Ends | | | Solve | Medium | | |
| 1754. Largest Merge Of Two Strings | | | Solve | Medium | | |
| 1759. Count Number of Homogenous Substrings | | | Solve | Medium | | |
| 1769. Minimum Number of Operations to Move All Balls to Each Box | | | Solve | Medium | | |
| 1772. Sort Features by Popularity | | | Solve | Medium | | |
| 1781. Sum of Beauty of All Substrings | | | Solve | Medium | | |
| 1794. Count Pairs of Equal Substrings With Minimum Difference | | | Solve | Medium | | |
| 1804. Implement Trie II (Prefix Tree) | | | Solve | Medium | | |
| 1807. Evaluate the Bracket Pairs of a String | | | Solve | Medium | | |
| 1813. Sentence Similarity III | | | Solve | Medium | | |
| 1839. Longest Substring Of All Vowels in Order | | | Solve | Medium | | |
| 1849. Splitting a String Into Descending Consecutive Values | | | Solve | Medium | - | |
| 1850. Minimum Adjacent Swaps to Reach the Kth Smallest Number | | | Solve | Medium | | |
| 1864. Minimum Number of Swaps to Make the Binary String Alternating | | | Solve | Medium | | |
| 1871. Jump Game VII | | | Solve | Medium | | |
| 1881. Maximum Value after Insertion | | | Solve | Medium | - | |
| 1888. Minimum Number of Flips to Make the Binary String Alternating | | | Solve | Medium | | |
| 1898. Maximum Number of Removable Characters | | | Solve | Medium | | |
| 1904. The Number of Full Rounds You Have Played | | | Solve | Medium | | |
| 1910. Remove All Occurrences of a Substring | | | Solve | Medium | | |
| 1915. Number of Wonderful Substrings | | | Solve | Medium | | |
| 1927. Sum Game | | | Solve | Medium | | |
| 1930. Unique Length-3 Palindromic Subsequences | | | Solve | Medium | | |
| 1946. Largest Number After Mutating Substring | | | Solve | Medium | | |
| 1963. Minimum Number of Swaps to Make the String Balanced | | | Solve | Medium | | |
| 1980. Find Unique Binary String | | | Solve | Medium | | |
| 1985. Find the Kth Largest Integer in the Array | | | Solve | Medium | | |
| 2002. Maximum Product of the Length of Two Palindromic Subsequences | | | Solve | Medium | | |
| 2023. Number of Pairs of Strings With Concatenation Equal to Target | | | Solve | Medium | | |
| 2024. Maximize the Confusion of an Exam | | | Solve | Medium | | |
| 2038. Remove Colored Pieces if Both Neighbors are the Same Color | | | Solve | Medium | | |
| 2055. Plates Between Candles | | | Solve | Medium | | |
| 2063. Vowels of All Substrings | | | Solve | Medium | | |
| 2067. Number of Equal Count Substrings | | | Solve | Medium | | |
| 2075. Decode the Slanted Ciphertext | | | Solve | Medium | | |
| 2083. Substrings That Begin and End With the Same Letter | | | Solve | Medium | - | |
