Practice problems across 75+ categories
Practice problems frequently asked at Microsoft • 3344 problems | 831 Easy | 1747 Medium | 746 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 3271 | Valid Number | Hard | String |
| 3272 | Valid Palindrome | Easy | Two PointersString |
| 3273 | Valid Palindrome II | Easy | Two PointersStringGreedy |
| 3274 | Valid Palindrome III | Hard | StringDynamic Programming |
| 3275 | Valid Palindrome IV | Medium | Two PointersString |
| 3276 | Valid Parentheses | Easy | StringStack |
| 3277 | Valid Parenthesis String | Medium | StringDynamic ProgrammingStack |
| 3278 | Valid Perfect Square | Easy | MathBinary Search |
| 3279 | Valid Permutations for DI Sequence | Hard | StringDynamic ProgrammingPrefix Sum |
| 3280 | Valid Phone Numbers | Easy | Shell |
| 3281 | Valid Square | Medium | MathGeometry |
| 3282 | Valid Sudoku | Medium | ArrayHash TableMatrix |
| 3283 | Valid Tic-Tac-Toe State | Medium | ArrayMatrix |
| 3284 | Valid Triangle Number | Medium | ArrayTwo PointersBinary Search |
| 3285 | Valid Word | Easy | String |
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