| 716. Max Stack | | | Solve | Hard | | |
| 726. Number of Atoms | | | Solve | Hard | | |
| 759. Employee Free Time | | | Solve | Hard | | |
| 768. Max Chunks To Make Sorted II | | | Solve | Hard | | |
| 772. Basic Calculator III | | | Solve | Hard | | |
| 805. Split Array With Same Average | | | Solve | Hard | | |
| 827. Making A Large Island | | | Solve | Hard | | |
| 828. Count Unique Characters of All Substrings of a Given String | | | Solve | Hard | | |
| 871. Minimum Number of Refueling Stops | | | Solve | Hard | | |
| 895. Maximum Frequency Stack | | | Solve | Hard | | |
| 972. Equal Rational Numbers | | | Solve | Hard | | |
| 987. Vertical Order Traversal of a Binary Tree | | | Solve | Hard | | |
| 1028. Recover a Tree From Preorder Traversal | | | Solve | Hard | | |
| 1032. Stream of Characters | | | Solve | Hard | | |
| 1092. Shortest Common Supersequence | | | Solve | Hard | | |
| 1153. String Transforms Into Another String | | | Solve | Hard | | |
| 1192. Critical Connections in a Network | | | Solve | Hard | | |
| 1206. Design Skiplist | | | Solve | Hard | | |
| 1246. Palindrome Removal | | | Solve | Hard | | |
| 1369. Get the Second Most Recent Activity | | | Solve | Hard | | |
| 1458. Max Dot Product of Two Subsequences | | | Solve | Hard | | |
| 1494. Parallel Courses II | | | Solve | Hard | | |
| 1510. Stone Game IV | | | Solve | Hard | | |
| 1531. String Compression II | | | Solve | Hard | | |
| 1671. Minimum Number of Removals to Make Mountain Array | | | Solve | Hard | | |
| 1681. Minimum Incompatibility | | | Solve | Hard | | |
| 1703. Minimum Adjacent Swaps for K Consecutive Ones | | | Solve | Hard | | |
| 1808. Maximize Number of Nice Divisors | | | Solve | Hard | | |
| 2035. Partition Array Into Two Arrays to Minimize Sum Difference | | | Solve | Hard | | |
| 2127. Maximum Employees to Be Invited to a Meeting | | | Solve | Hard | | |
| 2193. Minimum Number of Moves to Make Palindrome | | | Solve | Hard | | |
| 2218. Maximum Value of K Coins From Piles | | | Solve | Hard | | |
| 2246. Longest Path With Different Adjacent Characters | | | Solve | Hard | | |
| 2321. Maximum Score Of Spliced Array | | | Solve | Hard | | |
| 2360. Longest Cycle in a Graph | | | Solve | Hard | | |