Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 481 | Count the Number of Complete Components | Medium | Depth-First SearchBreadth-First SearchUnion Find |
| 482 | Count the Number of Computer Unlocking Permutations | Medium | ArrayMathBrainteaser |
| 483 | Count the Number of Consistent Strings | Easy | ArrayHash TableString |
| 484 | Count the Number of Experiments | Medium | Database |
| 485 | Count the Number of Fair Pairs | Medium | ArrayTwo PointersBinary Search |
| 486 | Count the Number of Good Nodes | Medium | TreeDepth-First Search |
| 487 | Count the Number of Good Partitions | Hard | ArrayHash TableMath |
| 488 | Count the Number of Good Subarrays | Medium | ArrayHash TableSliding Window |
| 489 | Count the Number of Good Subsequences | Medium | Hash TableMathString |
| 490 | Count the Number of Houses at a Certain Distance I | Medium | Breadth-First SearchGraphPrefix Sum |
| 491 | Count the Number of Houses at a Certain Distance II | Hard | GraphPrefix Sum |
| 492 | Count the Number of Ideal Arrays | Hard | MathDynamic ProgrammingCombinatorics |
| 493 | Count the Number of Incremovable Subarrays I | Easy | ArrayTwo PointersBinary Search |
| 494 | Count the Number of Incremovable Subarrays II | Hard | ArrayTwo PointersBinary Search |
| 495 | Count the Number of Infection Sequences | Hard | ArrayMathCombinatorics |
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