| 10. Regular Expression Matching | | | Solve | Hard | | |
| 32. Longest Valid Parentheses | | | Solve | Hard | | |
| 42. Trapping Rain Water | | | Solve | Hard | | |
| 44. Wildcard Matching | | | Solve | Hard | | |
| 85. Maximal Rectangle | | | Solve | Hard | | |
| 87. Scramble String | | | Solve | Hard | | |
| 115. Distinct Subsequences | | | Solve | Hard | | |
| 123. Best Time to Buy and Sell Stock III | | | Solve | Hard | | |
| 124. Binary Tree Maximum Path Sum | | | Solve | Hard | | |
| 132. Palindrome Partitioning II | | | Solve | Hard | | |
| 140. Word Break II | | | Solve | Hard | | |
| 174. Dungeon Game | | | Solve | Hard | | |
| 188. Best Time to Buy and Sell Stock IV | | | Solve | Hard | | |
| 233. Number of Digit One | | | Solve | Hard | | |
| 265. Paint House II | | | Solve | Hard | | |
| 312. Burst Balloons | | | Solve | Hard | | |
| 329. Longest Increasing Path in a Matrix | | | Solve | Hard | | |
| 354. Russian Doll Envelopes | | | Solve | Hard | | |
| 403. Frog Jump | | | Solve | Hard | | |
| 410. Split Array Largest Sum | | | Solve | Hard | | |
| 446. Arithmetic Slices II - Subsequence | | | Solve | Hard | | |
| 458. Poor Pigs | | | Solve | Hard | | |
| 465. Optimal Account Balancing | | | Solve | Hard | | |
| 466. Count The Repetitions | | | Solve | Hard | | |
| 471. Encode String with Shortest Length | | | Solve | Hard | | |
| 472. Concatenated Words | | | Solve | Hard | | |
| 488. Zuma Game | | | Solve | Hard | | |
| 514. Freedom Trail | | | Solve | Hard | | |
| 546. Remove Boxes | | | Solve | Hard | | |
| 552. Student Attendance Record II | | | Solve | Hard | | |
| 568. Maximum Vacation Days | | | Solve | Hard | | |
| 600. Non-negative Integers without Consecutive Ones | | | Solve | Hard | | |
| 629. K Inverse Pairs Array | | | Solve | Hard | | |
| 639. Decode Ways II | | | Solve | Hard | | |
| 656. Coin Path | | | Solve | Hard | | |
| 664. Strange Printer | | | Solve | Hard | | |
| 689. Maximum Sum of 3 Non-Overlapping Subarrays | | | Solve | Hard | | |
| 691. Stickers to Spell Word | | | Solve | Hard | | |
| 727. Minimum Window Subsequence | | | Solve | Hard | | |
| 730. Count Different Palindromic Subsequences | | | Solve | Hard | | |
| 741. Cherry Pickup | | | Solve | Hard | | |
| 773. Sliding Puzzle | | | Solve | Hard | | |
| 801. Minimum Swaps To Make Sequences Increasing | | | Solve | Hard | | |
| 805. Split Array With Same Average | | | Solve | Hard | | |
| 818. Race Car | | | Solve | Hard | | |
| 828. Count Unique Characters of All Substrings of a Given String | | | Solve | Hard | | |
| 834. Sum of Distances in Tree | | | Solve | Hard | | |
| 847. Shortest Path Visiting All Nodes | | | Solve | Hard | | |
| 871. Minimum Number of Refueling Stops | | | Solve | Hard | | |
| 879. Profitable Schemes | | | Solve | Hard | | |