Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 646 | Reorganize String | Medium | Hash TableStringGreedy |
| 647 | Repeated DNA Sequences | Medium | Hash TableStringBit Manipulation |
| 648 | Repeated String Match | Medium | StringString Matching |
| 649 | Repeated Substring Pattern | Easy | StringString Matching |
| 650 | Replace All Digits with Characters | Easy | String |
| 651 | Replace All ?'s to Avoid Consecutive Repeating Characters | Easy | String |
| 652 | Replace Question Marks in String to Minimize Its Value | Medium | Hash TableStringGreedy |
| 653 | Replace the Substring for Balanced String | Medium | StringSliding Window |
| 654 | Replace Words | Medium | ArrayHash TableString |
| 655 | Report Spam Message | Medium | ArrayHash TableString |
| 656 | Restore IP Addresses | Medium | StringBacktracking |
| 657 | Restore The Array | Hard | StringDynamic Programming |
| 658 | Resulting String After Adjacent Removals | Medium | StringStackSimulation |
| 659 | Reverse Degree of a String | Easy | StringSimulation |
| 660 | Reverse Only Letters | Easy | Two PointersString |
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