Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 241 | Count Fertile Pyramids in a Land | Hard | ArrayDynamic ProgrammingMatrix |
| 242 | Count Good Meals | Medium | ArrayHash Table |
| 243 | Count Good Triplets | Easy | ArrayEnumeration |
| 244 | Count Good Triplets in an Array | Hard | ArrayBinary SearchDivide and Conquer |
| 245 | Count Hills and Valleys in an Array | Easy | Array |
| 246 | Count Houses in a Circular Street | Easy | ArrayInteractive |
| 247 | Count Houses in a Circular Street II | Hard | ArrayTwo Pointers |
| 248 | Count Increasing Quadruplets | Hard | ArrayDynamic ProgrammingBinary Indexed Tree |
| 249 | Count Items Matching a Rule | Easy | ArrayString |
| 250 | Count Lattice Points Inside a Circle | Medium | ArrayHash TableMath |
| 251 | Count Mentions Per User | Medium | ArrayMathSorting |
| 252 | Count Negative Numbers in a Sorted Matrix | Easy | ArrayBinary SearchMatrix |
| 253 | Count Nice Pairs in an Array | Medium | ArrayHash TableMath |
| 254 | Count Nodes With the Highest Score | Medium | ArrayTreeDepth-First Search |
| 255 | Count Non-Decreasing Subarrays After K Operations | Hard | ArrayStackSegment Tree |
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