Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 2836 | User Activity for the Past 30 Days I | Easy | Database |
| 2837 | Users That Actively Request Confirmation Messages | Easy | Database |
| 2838 | Users With Two Purchases Within Seven Days | Medium | Database |
| 2839 | Using a Robot to Print the Lexicographically Smallest String | Medium | Hash TableStringStack |
| 2840 | Valid Anagram | Easy | Hash TableStringSorting |
| 2841 | Valid Arrangement of Pairs | Hard | Depth-First SearchGraphEulerian Circuit |
| 2842 | Valid Boomerang | Easy | ArrayMathGeometry |
| 2843 | Valid Number | Hard | String |
| 2844 | Valid Palindrome | Easy | Two PointersString |
| 2845 | Valid Palindrome III | Hard | StringDynamic Programming |
| 2846 | Valid Palindrome IV | Medium | Two PointersString |
| 2847 | Valid Parentheses | Easy | StringStack |
| 2848 | Valid Parenthesis String | Medium | StringDynamic ProgrammingStack |
| 2849 | Valid Perfect Square | Easy | MathBinary Search |
| 2850 | Valid Phone Numbers | Easy | Shell |
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