| 1679. Max Number of K-Sum Pairs | | | Solve | Medium | | |
| 1695. Maximum Erasure Value | | | Solve | Medium | | |
| 1711. Count Good Meals | | | Solve | Medium | | |
| 1726. Tuple with Same Product | | | Solve | Medium | | |
| 1733. Minimum Number of People to Teach | | | Solve | Medium | | |
| 1737. Change Minimum Characters to Satisfy One of Three Conditions | | | Solve | Medium | | |
| 1740. Find Distance in a Binary Tree | | | Solve | Medium | | |
| 1743. Restore the Array From Adjacent Pairs | | | Solve | Medium | | |
| 1756. Design Most Recently Used Queue | | | Solve | Medium | | |
| 1772. Sort Features by Popularity | | | Solve | Medium | | |
| 1775. Equal Sum Arrays With Minimum Number of Operations | | | Solve | Medium | | |
| 1781. Sum of Beauty of All Substrings | | | Solve | Medium | | |
| 1794. Count Pairs of Equal Substrings With Minimum Difference | | | Solve | Medium | | |
| 1797. Design Authentication Manager | | | Solve | Medium | | |
| 1804. Implement Trie II (Prefix Tree) | | | Solve | Medium | | |
| 1807. Evaluate the Bracket Pairs of a String | | | Solve | Medium | | |
| 1814. Count Nice Pairs in an Array | | | Solve | Medium | | |
| 1817. Finding the Users Active Minutes | | | Solve | Medium | | |
| 1836. Remove Duplicates From an Unsorted Linked List | | | Solve | Medium | | |
| 1852. Distinct Numbers in Each Subarray | | | Solve | Medium | | |
| 1865. Finding Pairs With a Certain Sum | | | Solve | Medium | | |
| 1906. Minimum Absolute Difference Queries | | | Solve | Medium | | |
| 1915. Number of Wonderful Substrings | | | Solve | Medium | | |
| 1930. Unique Length-3 Palindromic Subsequences | | | Solve | Medium | | |
| 1940. Longest Common Subsequence Between Sorted Arrays | | | Solve | Medium | | |
| 1942. The Number of the Smallest Unoccupied Chair | | | Solve | Medium | | |
| 1943. Describe the Painting | | | Solve | Medium | | |
| 1980. Find Unique Binary String | | | Solve | Medium | | |
| 1983. Widest Pair of Indices With Equal Range Sum | | | Solve | Medium | | |
| 1993. Operations on Tree | | | Solve | Medium | | |
| 2001. Number of Pairs of Interchangeable Rectangles | | | Solve | Medium | - | |
| 2007. Find Original Array From Doubled Array | | | Solve | Medium | | |
| 2008. Maximum Earnings From Taxi | | | Solve | Medium | | |
| 2013. Detect Squares | | | Solve | Medium | | |
| 2023. Number of Pairs of Strings With Concatenation Equal to Target | | | Solve | Medium | | |
| 2034. Stock Price Fluctuation | | | Solve | Medium | | |
| 2043. Simple Bank System | | | Solve | Medium | | |
| 2080. Range Frequency Queries | | | Solve | Medium | | |
| 2083. Substrings That Begin and End With the Same Letter | | | Solve | Medium | - | |
| 2107. Number of Unique Flavors After Sharing K Candies | | | Solve | Medium | | |
| 2115. Find All Possible Recipes from Given Supplies | | | Solve | Medium | | |
| 2121. Intervals Between Identical Elements | | | Solve | Medium | | |
| 2131. Longest Palindrome by Concatenating Two Letter Words | | | Solve | Medium | | |
| 2135. Count Words Obtained After Adding a Letter | | | Solve | Medium | | |
| 2150. Find All Lonely Numbers in the Array | | | Solve | Medium | | |
| 2152. Minimum Number of Lines to Cover Points | | | Solve | Medium | | |
| 2166. Design Bitset | | | Solve | Medium | | |
| 2168. Unique Substrings With Equal Digit Frequency | | | Solve | Medium | | |
| 2170. Minimum Operations to Make the Array Alternating | | | Solve | Medium | - | |
| 2182. Construct String With Repeat Limit | | | Solve | Medium | | |
