Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 616 | Rearrange Spaces Between Words | Easy | String |
| 617 | Rearrange String k Distance Apart | Hard | Hash TableStringGreedy |
| 618 | Rearrange Words in a Sentence | Medium | StringSorting |
| 619 | Reconstruct Original Digits from English | Medium | Hash TableMathString |
| 620 | Recover a Tree From Preorder Traversal | Hard | StringTreeDepth-First Search |
| 621 | Redistribute Characters to Make All Strings Equal | Easy | Hash TableStringCounting |
| 622 | Reformat Date | Easy | String |
| 623 | Reformat Phone Number | Easy | String |
| 624 | Reformat The String | Easy | String |
| 625 | Regex Pattern Matcher | Medium | Advanced StringsStringPattern |
| 626 | Regular Expression Matching | Hard | StringDynamic ProgrammingRecursion |
| 627 | Remove Adjacent Almost-Equal Characters | Medium | StringDynamic ProgrammingGreedy |
| 628 | Remove All Adjacent Duplicates In String | Easy | StringStack |
| 629 | Remove All Adjacent Duplicates in String II | Medium | StringStack |
| 630 | Remove All Occurrences of a Substring | Medium | StringStackSimulation |
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