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0 Easy2 Medium3 Hard5 total
| No. | Problem | Difficulty | Frequency |
|---|---|---|---|
| 1063 | Number of Valid Subarrays | Hard | |
| 772 | Basic Calculator III | Hard | |
| 814 | Binary Tree Pruning | Medium | |
| 371 | Sum of Two Integers | Medium | |
| 440 | K-th Smallest in Lexicographical Order | Hard |