Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 16 | Active Users | Medium | Database |
| 17 | Activity Participants | Medium | Database |
| 18 | Actors and Directors Who Cooperated At Least Three Times | Easy | Database |
| 19 | Add Binary | Easy | MathStringBit Manipulation |
| 20 | Add Bold Tag in String | Medium | ArrayHash TableString |
| 21 | Add Edges to Make Degrees of All Nodes Even | Hard | Hash TableGraph |
| 22 | Add Minimum Number of Rungs | Medium | ArrayGreedy |
| 23 | Add One Row to Tree | Medium | TreeDepth-First SearchBreadth-First Search |
| 24 | Add Strings | Easy | MathStringSimulation |
| 25 | Add Two Numbers | Medium | Linked ListMathRecursion |
| 26 | Add Two Polynomials Represented as Linked Lists | Medium | Linked ListMathTwo Pointers |
| 27 | Add Two Promises | Easy | JavaScript |
| 28 | Adding Spaces to a String | Medium | ArrayTwo PointersString |
| 29 | Additive Number | Medium | StringBacktracking |
| 30 | Adjacent Increasing Subarrays Detection I | Easy | Array |
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