Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 616 | Replace All Digits with Characters | Easy | String |
| 617 | Replace All ?'s to Avoid Consecutive Repeating Characters | Easy | String |
| 618 | Replace Question Marks in String to Minimize Its Value | Medium | Hash TableStringGreedy |
| 619 | Replace the Substring for Balanced String | Medium | StringSliding Window |
| 620 | Replace Words | Medium | ArrayHash TableString |
| 621 | Report Spam Message | Medium | ArrayHash TableString |
| 622 | Restore IP Addresses | Medium | StringBacktracking |
| 623 | Restore The Array | Hard | StringDynamic Programming |
| 624 | Resulting String After Adjacent Removals | Medium | StringStackSimulation |
| 625 | Reverse Degree of a String | Easy | StringSimulation |
| 626 | Reverse Only Letters | Easy | Two PointersString |
| 627 | Reverse Prefix of Word | Easy | Two PointersStringStack |
| 628 | Reverse String | Easy | Two PointersString |
| 629 | Reverse String II | Easy | Two PointersString |
| 630 | Reverse Substrings Between Each Pair of Parentheses | Medium | StringStack |
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