Practice problems across 75+ categories
Practice coding problems across all companies and topics • 3600 problems | 879 Easy | 1856 Medium | 842 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 3541 | Valid Boomerang | Easy | ArrayMathGeometry |
| 3542 | Valid Mountain Array | Easy | Array |
| 3543 | Valid Number | Hard | String |
| 3544 | Valid Palindrome | Easy | Two PointersString |
| 3545 | Valid Palindrome II | Easy | Two PointersStringGreedy |
| 3546 | Valid Palindrome III | Hard | StringDynamic Programming |
| 3547 | Valid Palindrome IV | Medium | Two PointersString |
| 3548 | Valid Parentheses | Easy | StringStack |
| 3549 | Valid Parenthesis String | Medium | StringDynamic ProgrammingStack |
| 3550 | Valid Perfect Square | Easy | MathBinary Search |
| 3551 | Valid Permutations for DI Sequence | Hard | StringDynamic ProgrammingPrefix Sum |
| 3552 | Valid Phone Numbers | Easy | Shell |
| 3553 | Valid Square | Medium | MathGeometry |
| 3554 | Valid Sudoku | Medium | ArrayHash TableMatrix |
| 3555 | Valid Tic-Tac-Toe State | Medium | ArrayMatrix |
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