Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 601 | Remove Duplicate Letters | Medium | StringStackGreedy |
| 602 | Remove Invalid Parentheses | Hard | StringBacktrackingBreadth-First Search |
| 603 | Remove K Digits | Medium | StringStackGreedy |
| 604 | Remove Letter To Equalize Frequency | Easy | Hash TableStringCounting |
| 605 | Remove Outermost Parentheses | Easy | StringStack |
| 606 | Remove Palindromic Subsequences | Easy | Two PointersString |
| 607 | Remove Sub-Folders from the Filesystem | Medium | ArrayStringDepth-First Search |
| 608 | Remove Trailing Zeros From a String | Easy | String |
| 609 | Remove Vowels from a String | Easy | String |
| 610 | Removing Stars From a String | Medium | StringStackSimulation |
| 611 | Reorder Data in Log Files | Medium | ArrayStringSorting |
| 612 | Reorganize String | Medium | Hash TableStringGreedy |
| 613 | Repeated DNA Sequences | Medium | Hash TableStringBit Manipulation |
| 614 | Repeated String Match | Medium | StringString Matching |
| 615 | Repeated Substring Pattern | Easy | StringString Matching |
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