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4 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| User Activity for the Past 30 Days I | Easy | 100% | TopicsDatabase |
| User Activity for the Past 30 Days II | Easy | 100% | TopicsDatabase |
| 212. Word Search II | Hard | 78.4% | TopicsArrayStringBacktrackingTrieMatrix |
| 146. LRU Cache | Medium | 69.5% | TopicsHash TableLinked ListDesignDoubly-Linked List |
