Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1906 | Unique Paths III | Hard | ArrayBacktrackingBit Manipulation |
| 1907 | Unique Word Abbreviation | Medium | ArrayHash TableString |
| 1908 | Unit Conversion II | Medium | ArrayMathDepth-First Search |
| 1909 | UTF-8 Validation | Medium | ArrayBit Manipulation |
| 1910 | Valid Boomerang | Easy | ArrayMathGeometry |
| 1911 | Valid Mountain Array | Easy | Array |
| 1912 | Valid Sudoku | Medium | ArrayHash TableMatrix |
| 1913 | Valid Tic-Tac-Toe State | Medium | ArrayMatrix |
| 1914 | Valid Triangle Number | Medium | ArrayTwo PointersBinary Search |
| 1915 | Valid Word Square | Easy | ArrayMatrix |
| 1916 | Validate Stack Sequences | Medium | ArrayStackSimulation |
| 1917 | Verbal Arithmetic Puzzle | Hard | ArrayMathString |
| 1918 | Verify Preorder Sequence in Binary Search Tree | Medium | ArrayStackTree |
| 1919 | Verifying an Alien Dictionary | Easy | ArrayHash TableString |
| 1920 | Video Stitching | Medium | ArrayDynamic ProgrammingGreedy |
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