Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 631 | Reverse Vowels of a String | Easy | Two PointersString |
| 632 | Reverse Words in a String | Medium | Two PointersString |
| 633 | Reverse Words in a String II | Medium | Two PointersString |
| 634 | Reverse Words in a String III | Easy | Two PointersString |
| 635 | Reward Top K Students | Medium | ArrayHash TableString |
| 636 | Rings and Rods | Easy | Hash TableString |
| 637 | Robot Bounded In Circle | Medium | MathStringSimulation |
| 638 | Robot Return to Origin | Easy | StringSimulation |
| 639 | Roman to Integer | Easy | Hash TableMathString |
| 640 | Rotate String | Easy | StringString Matching |
| 641 | Satisfiability of Equality Equations | Medium | ArrayStringUnion Find |
| 642 | Score of a String | Easy | String |
| 643 | Score of Parentheses | Medium | StringStack |
| 644 | Scramble String | Hard | StringDynamic Programming |
| 645 | Search Suggestions System | Medium | ArrayStringBinary Search |
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