Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 781 | Validate IP Address | Medium | String |
| 782 | Verbal Arithmetic Puzzle | Hard | ArrayMathString |
| 783 | Verify Preorder Serialization of a Binary Tree | Medium | StringStackTree |
| 784 | Verifying an Alien Dictionary | Easy | ArrayHash TableString |
| 785 | Vowel Spellchecker | Medium | ArrayHash TableString |
| 786 | Vowels Game in a String | Medium | MathStringBrainteaser |
| 787 | Vowels of All Substrings | Medium | MathStringDynamic Programming |
| 788 | Web Crawler | Medium | StringDepth-First SearchBreadth-First Search |
| 789 | Wildcard Matching | Hard | StringDynamic ProgrammingGreedy |
| 790 | Word Abbreviation | Hard | ArrayStringGreedy |
| 791 | Word Break | Medium | ArrayHash TableString |
| 792 | Word Break II | Hard | ArrayHash TableString |
| 793 | Word Ladder | Hard | Hash TableStringBreadth-First Search |
| 794 | Word Ladder II | Hard | Hash TableStringBacktracking |
| 795 | Word Pattern | Easy | Hash TableString |
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