| 1036 | Escape a Large Maze | Hard |
| 1044 | Longest Duplicate Substring | Hard |
| 1074 | Number of Submatrices That Sum to Target | Hard |
| 1092 | Shortest Common Supersequence | Hard |
| 1095 | Find in Mountain Array | Hard |
| 1096 | Brace Expansion II | Hard |
| 1106 | Parsing A Boolean Expression | Hard |
| 1125 | Smallest Sufficient Team | Hard |
| 1157 | Online Majority Element In Subarray | Hard |
| 1163 | Last Substring in Lexicographical Order | Hard |
| 1172 | Dinner Plate Stacks | Hard |
| 1178 | Number of Valid Words for Each Puzzle | Hard |
| 1187 | Make Array Strictly Increasing | Hard |
| 1192 | Critical Connections in a Network | Hard |
| 1203 | Sort Items by Groups Respecting Dependencies | Hard |
| 1206 | Design Skiplist | Hard |
| 1210 | Minimum Moves to Reach Target with Rotations | Hard |
| 1220 | Count Vowels Permutation | Hard |
| 1223 | Dice Roll Simulation | Hard |
| 1224 | Maximum Equal Frequency | Hard |
| 1235 | Maximum Profit in Job Scheduling | Hard |
| 1240 | Tiling a Rectangle with the Fewest Squares | Hard |
| 1250 | Check If It Is a Good Array | Hard |
| 1251 | Longest Chunked Palindrome Decomposition | Hard |
| 1255 | Maximum Score Words Formed by Letters | Hard |
| 1263 | Minimum Moves to Move a Box to Their Target Location | Hard |
| 1269 | Number of Ways to Stay in the Same Place After Some Steps | Hard |
| 1278 | Palindrome Partitioning III | Hard |
| 1284 | Minimum Number of Flips to Convert Binary Matrix to Zero Matrix | Hard |
| 1289 | Minimum Falling Path Sum II | Hard |