Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1906 | Valid Tic-Tac-Toe State | Medium | ArrayMatrix |
| 1907 | Valid Triangle Number | Medium | ArrayTwo PointersBinary Search |
| 1908 | Valid Word Square | Easy | ArrayMatrix |
| 1909 | Validate Stack Sequences | Medium | ArrayStackSimulation |
| 1910 | Verbal Arithmetic Puzzle | Hard | ArrayMathString |
| 1911 | Verify Preorder Sequence in Binary Search Tree | Medium | ArrayStackTree |
| 1912 | Verifying an Alien Dictionary | Easy | ArrayHash TableString |
| 1913 | Video Stitching | Medium | ArrayDynamic ProgrammingGreedy |
| 1914 | Visit Array Positions to Maximize Score | Medium | ArrayDynamic Programming |
| 1915 | Vowel Spellchecker | Medium | ArrayHash TableString |
| 1916 | Walking Robot Simulation | Medium | ArrayHash TableSimulation |
| 1917 | Walls and Gates | Medium | ArrayBreadth-First SearchMatrix |
| 1918 | Watering Plants | Medium | ArraySimulation |
| 1919 | Watering Plants II | Medium | ArrayTwo PointersSimulation |
| 1920 | Ways to Make a Fair Array | Medium | ArrayPrefix Sum |
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