Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 391 | Count Increasing Quadruplets | Hard | ArrayDynamic ProgrammingBinary Indexed Tree |
| 392 | Count Integers in Intervals | Hard | DesignSegment TreeOrdered Set |
| 393 | Count K-Subsequences of a String With Maximum Beauty | Hard | Hash TableMathString |
| 394 | Count Lattice Points Inside a Circle | Medium | ArrayHash TableMath |
| 395 | Count Mentions Per User | Medium | ArrayMathSorting |
| 396 | Count Negative Numbers in a Sorted Matrix | Easy | ArrayBinary SearchMatrix |
| 397 | Count Nice Pairs in an Array | Medium | ArrayHash TableMath |
| 398 | Count Nodes Equal to Average of Subtree | Medium | TreeDepth-First SearchBinary Tree |
| 399 | Count Nodes Equal to Sum of Descendants | Medium | TreeDepth-First SearchBinary Tree |
| 400 | Count Nodes That Are Great Enough | Hard | Divide and ConquerTreeDepth-First Search |
| 401 | Count Nodes With the Highest Score | Medium | ArrayTreeDepth-First Search |
| 402 | Count Non-Decreasing Subarrays After K Operations | Hard | ArrayStackSegment Tree |
| 403 | Count Number of Bad Pairs | Medium | ArrayHash TableMath |
| 404 | Count Number of Balanced Permutations | Hard | MathStringDynamic Programming |
| 405 | Count Number of Distinct Integers After Reverse Operations | Medium | ArrayHash TableMath |
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