Practice problems across 75+ categories
Practice problems frequently asked at Amazon • 3399 problems | 851 Easy | 1772 Medium | 756 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 3331 | Valid Permutations for DI Sequence | Hard | StringDynamic ProgrammingPrefix Sum |
| 3332 | Valid Phone Numbers | Easy | Shell |
| 3333 | Valid Square | Medium | MathGeometry |
| 3334 | Valid Sudoku | Medium | ArrayHash TableMatrix |
| 3335 | Valid Tic-Tac-Toe State | Medium | ArrayMatrix |
| 3336 | Valid Triangle Number | Medium | ArrayTwo PointersBinary Search |
| 3337 | Valid Word | Easy | String |
| 3338 | Valid Word Square | Easy | ArrayMatrix |
| 3339 | Validate Binary Search Tree | Medium | TreeDepth-First SearchBinary Search Tree |
| 3340 | Validate Binary Tree Nodes | Medium | TreeDepth-First SearchBreadth-First Search |
| 3341 | Validate IP Address | Medium | String |
| 3342 | Validate Stack Sequences | Medium | ArrayStackSimulation |
| 3343 | Verbal Arithmetic Puzzle | Hard | ArrayMathString |
| 3344 | Verify Preorder Sequence in Binary Search Tree | Medium | ArrayStackTree |
| 3345 | Verify Preorder Serialization of a Binary Tree | Medium | StringStackTree |
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