Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 661 | Reverse Prefix of Word | Easy | Two PointersStringStack |
| 662 | Reverse String | Easy | Two PointersString |
| 663 | Reverse String II | Easy | Two PointersString |
| 664 | Reverse Substrings Between Each Pair of Parentheses | Medium | StringStack |
| 665 | Reverse Vowels of a String | Easy | Two PointersString |
| 666 | Reverse Words in a String | Medium | Two PointersString |
| 667 | Reverse Words in a String II | Medium | Two PointersString |
| 668 | Reverse Words in a String III | Easy | Two PointersString |
| 669 | Reward Top K Students | Medium | ArrayHash TableString |
| 670 | Rings and Rods | Easy | Hash TableString |
| 671 | Robot Bounded In Circle | Medium | MathStringSimulation |
| 672 | Robot Return to Origin | Easy | StringSimulation |
| 673 | Roman to Integer | Easy | Hash TableMathString |
| 674 | Rope Data Structure | Hard | Advanced DSTreeString |
| 675 | ROT13 Encoder/Decoder | Easy | StringsStringASCII |
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