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Rokt
2 Easy2 Medium2 Hard6 total
| No. | Problem | Difficulty | Frequency |
|---|---|---|---|
| 227 | Basic Calculator II | Medium | |
| 224 | Basic Calculator | Hard | |
| 408 | Valid Word Abbreviation | Easy | |
| 10 | Regular Expression Matching | Hard | |
| 20 | Valid Parentheses | Easy | |
| 1472 | Design Browser History | Medium |