Practice problems across 75+ categories
Practice problems frequently asked at Amazon • 3399 problems | 851 Easy | 1772 Medium | 756 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 631 | Count Zero Request Servers | Medium | ArrayHash TableSliding Window |
| 632 | Counter | Easy | JavaScript |
| 633 | Counter II | Easy | JavaScript |
| 634 | Counting Bits | Easy | Dynamic ProgrammingBit Manipulation |
| 635 | Counting Elements | Easy | ArrayHash Table |
| 636 | Counting Words With a Given Prefix | Easy | ArrayStringString Matching |
| 637 | Countries You Can Safely Invest In | Medium | Database |
| 638 | Couples Holding Hands | Hard | GreedyDepth-First SearchBreadth-First Search |
| 639 | Course Schedule | Medium | Depth-First SearchBreadth-First SearchGraph |
| 640 | Course Schedule II | Medium | Depth-First SearchBreadth-First SearchGraph |
| 641 | Course Schedule III | Hard | ArrayGreedySorting |
| 642 | Course Schedule IV | Medium | Depth-First SearchBreadth-First SearchGraph |
| 643 | Cousins in Binary Tree | Easy | TreeDepth-First SearchBreadth-First Search |
| 644 | Cracking the Safe | Hard | Depth-First SearchGraphEulerian Circuit |
| 645 | Crawler Log Folder | Easy | ArrayStringStack |
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