Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 2851 | Valid Tic-Tac-Toe State | Medium | ArrayMatrix |
| 2852 | Valid Triangle Number | Medium | ArrayTwo PointersBinary Search |
| 2853 | Valid Word | Easy | String |
| 2854 | Valid Word Square | Easy | ArrayMatrix |
| 2855 | Validate Binary Search Tree | Medium | TreeDepth-First SearchBinary Search Tree |
| 2856 | Validate Binary Tree Nodes | Medium | TreeDepth-First SearchBreadth-First Search |
| 2857 | Validate Stack Sequences | Medium | ArrayStackSimulation |
| 2858 | Verbal Arithmetic Puzzle | Hard | ArrayMathString |
| 2859 | Verify Preorder Serialization of a Binary Tree | Medium | StringStackTree |
| 2860 | Video Stitching | Medium | ArrayDynamic ProgrammingGreedy |
| 2861 | Viewers Turned Streamers | Hard | Database |
| 2862 | Visit Array Positions to Maximize Score | Medium | ArrayDynamic Programming |
| 2863 | Vowels Game in a String | Medium | MathStringBrainteaser |
| 2864 | Vowels of All Substrings | Medium | MathStringDynamic Programming |
| 2865 | Walking Robot Simulation II | Medium | DesignSimulation |
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