Practice problems across 75+ categories
Practice problems frequently asked at Google • 3407 problems | 851 Easy | 1775 Medium | 761 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 3331 | Valid Mountain Array | Easy | Array |
| 3332 | Valid Number | Hard | String |
| 3333 | Valid Palindrome | Easy | Two PointersString |
| 3334 | Valid Palindrome II | Easy | Two PointersStringGreedy |
| 3335 | Valid Palindrome III | Hard | StringDynamic Programming |
| 3336 | Valid Palindrome IV | Medium | Two PointersString |
| 3337 | Valid Parentheses | Easy | StringStack |
| 3338 | Valid Parenthesis String | Medium | StringDynamic ProgrammingStack |
| 3339 | Valid Perfect Square | Easy | MathBinary Search |
| 3340 | Valid Permutations for DI Sequence | Hard | StringDynamic ProgrammingPrefix Sum |
| 3341 | Valid Phone Numbers | Easy | Shell |
| 3342 | Valid Square | Medium | MathGeometry |
| 3343 | Valid Sudoku | Medium | ArrayHash TableMatrix |
| 3344 | Valid Tic-Tac-Toe State | Medium | ArrayMatrix |
| 3345 | Valid Triangle Number | Medium | ArrayTwo PointersBinary Search |
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