Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 631 | Remove Colored Pieces if Both Neighbors are the Same Color | Medium | MathStringGreedy |
| 632 | Remove Comments | Medium | ArrayString |
| 633 | Remove Digit From Number to Maximize Result | Easy | StringGreedyEnumeration |
| 634 | Remove Duplicate Letters | Medium | StringStackGreedy |
| 635 | Remove Duplicates from String | Easy | StringsStringSet/Loop |
| 636 | Remove Invalid Parentheses | Hard | StringBacktrackingBreadth-First Search |
| 637 | Remove K Digits | Medium | StringStackGreedy |
| 638 | Remove Letter To Equalize Frequency | Easy | Hash TableStringCounting |
| 639 | Remove Outermost Parentheses | Easy | StringStack |
| 640 | Remove Palindromic Subsequences | Easy | Two PointersString |
| 641 | Remove Sub-Folders from the Filesystem | Medium | ArrayStringDepth-First Search |
| 642 | Remove Trailing Zeros From a String | Easy | String |
| 643 | Remove Vowels from a String | Easy | String |
| 644 | Removing Stars From a String | Medium | StringStackSimulation |
| 645 | Reorder Data in Log Files | Medium | ArrayStringSorting |
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