Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 2641 | Strong Password Checker II | Easy | String |
| 2642 | Student Attendance Record I | Easy | String |
| 2643 | Student Attendance Record II | Hard | Dynamic Programming |
| 2644 | Students and Examinations | Easy | Database |
| 2645 | Students With Invalid Departments | Easy | Database |
| 2646 | Subarray Product Less Than K | Medium | ArrayBinary SearchSliding Window |
| 2647 | Subarray Sums Divisible by K | Medium | ArrayHash TablePrefix Sum |
| 2648 | Subarray With Elements Greater Than Varying Threshold | Hard | ArrayStackUnion Find |
| 2649 | Subarrays Distinct Element Sum of Squares I | Easy | ArrayHash Table |
| 2650 | Subarrays Distinct Element Sum of Squares II | Hard | ArrayDynamic ProgrammingBinary Indexed Tree |
| 2651 | Subarrays with K Different Integers | Hard | ArrayHash TableSliding Window |
| 2652 | Subdomain Visit Count | Medium | ArrayHash TableString |
| 2653 | Subsequence of Size K With the Largest Even Sum | Medium | ArrayGreedySorting |
| 2654 | Subsequence With the Minimum Score | Hard | Two PointersStringBinary Search |
| 2655 | Subsequences with a Unique Middle Mode I | Hard | ArrayHash TableMath |
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