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5 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| Number of Valid Subarrays | Hard | 100% | TopicsArrayStackMonotonic Stack |
| Basic Calculator III | Hard | 100% | TopicsMathStringStackRecursion |
| 814. Binary Tree Pruning | Medium | 100% | TopicsTreeDepth-First SearchBinary Tree |
| Sum of Two Integers | Medium | 100% | TopicsMathBit Manipulation |
| K-th Smallest in Lexicographical Order | Hard | 100% | TopicsTrie |
