Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 451 | Count Special Subsequences | Medium | ArrayHash TableMath |
| 452 | Count Special Triplets | Medium | ArrayHash TableCounting |
| 453 | Count Stepping Numbers in Range | Hard | StringDynamic Programming |
| 454 | Count Strictly Increasing Subarrays | Medium | ArrayMathDynamic Programming |
| 455 | Count Sub Islands | Medium | ArrayDepth-First SearchBreadth-First Search |
| 456 | Count Subarrays of Length Three With a Condition | Easy | Array |
| 457 | Count Subarrays Where Max Element Appears at Least K Times | Medium | ArraySliding Window |
| 458 | Count Subarrays With Fixed Bounds | Hard | ArrayQueueSliding Window |
| 459 | Count Subarrays With Median K | Hard | ArrayHash TablePrefix Sum |
| 460 | Count Subarrays With More Ones Than Zeros | Medium | ArrayHash TableBinary Search |
| 461 | Count Subarrays With Score Less Than K | Hard | ArrayBinary SearchSliding Window |
| 462 | Count Submatrices With All Ones | Medium | ArrayDynamic ProgrammingStack |
| 463 | Count Submatrices With Equal Frequency of X and Y | Medium | ArrayMatrixPrefix Sum |
| 464 | Count Submatrices with Top-Left Element and Sum Less Than k | Medium | ArrayMatrixPrefix Sum |
| 465 | Count Substrings Divisible By Last Digit | Hard | StringDynamic Programming |
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