Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 256 | Count Number of Bad Pairs | Medium | ArrayHash TableMath |
| 257 | Count Number of Distinct Integers After Reverse Operations | Medium | ArrayHash TableMath |
| 258 | Count Number of Maximum Bitwise-OR Subsets | Medium | ArrayBacktrackingBit Manipulation |
| 259 | Count Number of Nice Subarrays | Medium | ArrayHash TableMath |
| 260 | Count Number of Pairs With Absolute Difference K | Easy | ArrayHash TableCounting |
| 261 | Count Number of Possible Root Nodes | Hard | ArrayHash TableDynamic Programming |
| 262 | Count Number of Rectangles Containing Each Point | Medium | ArrayHash TableBinary Search |
| 263 | Count Number of Special Subsequences | Hard | ArrayDynamic Programming |
| 264 | Count Number of Teams | Medium | ArrayDynamic ProgrammingBinary Indexed Tree |
| 265 | Count Occurrences | Easy | ArraysArrayLoop |
| 266 | Count of Interesting Subarrays | Medium | ArrayHash TablePrefix Sum |
| 267 | Count of Range Sum | Hard | ArrayBinary SearchDivide and Conquer |
| 268 | Count of Smaller Numbers After Self | Hard | ArrayBinary SearchDivide and Conquer |
| 269 | Count of Sub-Multisets With Bounded Sum | Hard | ArrayHash TableDynamic Programming |
| 270 | Count Pairs in Two Arrays | Medium | ArrayTwo PointersBinary Search |
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