Practice problems across 75+ categories
Practice coding problems across all companies and topics • 3600 problems | 879 Easy | 1856 Medium | 842 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 3826 | Valid Permutations for DI Sequence | Hard | StringDynamic ProgrammingPrefix Sum |
| 3827 | Valid Phone Numbers | Easy | Shell |
| 3828 | Valid Square | Medium | MathGeometry |
| 3829 | Valid Sudoku | Medium | ArrayHash TableMatrix |
| 3830 | Valid Tic-Tac-Toe State | Medium | ArrayMatrix |
| 3831 | Valid Triangle Number | Medium | ArrayTwo PointersBinary Search |
| 3832 | Valid Word | Easy | String |
| 3833 | Valid Word Abbreviation | Easy | Two PointersString |
| 3834 | Valid Word Square | Easy | ArrayMatrix |
| 3835 | Validate Binary Search Tree | Medium | TreeDepth-First SearchBinary Search Tree |
| 3836 | Validate Binary Tree Nodes | Medium | TreeDepth-First SearchBreadth-First Search |
| 3837 | Validate Date Function | Easy | FunctionsFunctionsLogic |
| 3838 | Validate IP Address | Medium | String |
| 3839 | Validate Stack Sequences | Medium | ArrayStackSimulation |
| 3840 | Van Emde Boas Tree | Hard | Advanced DSTreeBit Operations |
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