Practice problems across 75+ categories
Practice problems frequently asked at Amazon • 3399 problems | 851 Easy | 1772 Medium | 756 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 496 | Count Number of Bad Pairs | Medium | ArrayHash TableMath |
| 497 | Count Number of Balanced Permutations | Hard | MathStringDynamic Programming |
| 498 | Count Number of Distinct Integers After Reverse Operations | Medium | ArrayHash TableMath |
| 499 | Count Number of Homogenous Substrings | Medium | MathString |
| 500 | Count Number of Maximum Bitwise-OR Subsets | Medium | ArrayBacktrackingBit Manipulation |
| 501 | Count Number of Nice Subarrays | Medium | ArrayHash TableMath |
| 502 | Count Number of Pairs With Absolute Difference K | Easy | ArrayHash TableCounting |
| 503 | Count Number of Possible Root Nodes | Hard | ArrayHash TableDynamic Programming |
| 504 | Count Number of Rectangles Containing Each Point | Medium | ArrayHash TableBinary Search |
| 505 | Count Number of Special Subsequences | Hard | ArrayDynamic Programming |
| 506 | Count Number of Teams | Medium | ArrayDynamic ProgrammingBinary Indexed Tree |
| 507 | Count Number of Texts | Medium | Hash TableMathString |
| 508 | Count Number of Ways to Place Houses | Medium | Dynamic Programming |
| 509 | Count Numbers with Non-Decreasing Digits | Unknown | MathStringDynamic Programming |
| 510 | Count Numbers with Unique Digits | Medium | MathDynamic ProgrammingBacktracking |
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