Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 526 | Count Zero Request Servers | Medium | ArrayHash TableSliding Window |
| 527 | Counter | Easy | JavaScript |
| 528 | Counter II | Easy | JavaScript |
| 529 | Counting Bits | Easy | Dynamic ProgrammingBit Manipulation |
| 530 | Counting Elements | Easy | ArrayHash Table |
| 531 | Counting Words With a Given Prefix | Easy | ArrayStringString Matching |
| 532 | Countries You Can Safely Invest In | Medium | Database |
| 533 | Couples Holding Hands | Hard | GreedyDepth-First SearchBreadth-First Search |
| 534 | Course Schedule | Medium | Depth-First SearchBreadth-First SearchGraph |
| 535 | Course Schedule II | Medium | Depth-First SearchBreadth-First SearchGraph |
| 536 | Course Schedule III | Hard | ArrayGreedySorting |
| 537 | Course Schedule IV | Medium | Depth-First SearchBreadth-First SearchGraph |
| 538 | Cracking the Safe | Hard | Depth-First SearchGraphEulerian Circuit |
| 539 | Create a DataFrame from List | Easy | Pandas |
| 540 | Create a Session Bar Chart | Easy | Database |
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