Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 241 | Count Negative Numbers in a Sorted Matrix | Easy | ArrayBinary SearchMatrix |
| 242 | Count Nice Pairs in an Array | Medium | ArrayHash TableMath |
| 243 | Count Nodes With the Highest Score | Medium | ArrayTreeDepth-First Search |
| 244 | Count Non-Decreasing Subarrays After K Operations | Hard | ArrayStackSegment Tree |
| 245 | Count Number of Bad Pairs | Medium | ArrayHash TableMath |
| 246 | Count Number of Distinct Integers After Reverse Operations | Medium | ArrayHash TableMath |
| 247 | Count Number of Maximum Bitwise-OR Subsets | Medium | ArrayBacktrackingBit Manipulation |
| 248 | Count Number of Nice Subarrays | Medium | ArrayHash TableMath |
| 249 | Count Number of Pairs With Absolute Difference K | Easy | ArrayHash TableCounting |
| 250 | Count Number of Possible Root Nodes | Hard | ArrayHash TableDynamic Programming |
| 251 | Count Number of Rectangles Containing Each Point | Medium | ArrayHash TableBinary Search |
| 252 | Count Number of Special Subsequences | Hard | ArrayDynamic Programming |
| 253 | Count Number of Teams | Medium | ArrayDynamic ProgrammingBinary Indexed Tree |
| 254 | Count of Interesting Subarrays | Medium | ArrayHash TablePrefix Sum |
| 255 | Count of Range Sum | Hard | ArrayBinary SearchDivide and Conquer |
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