Practice problems across 75+ categories
Practice problems frequently asked at Amazon • 3399 problems | 851 Easy | 1772 Medium | 756 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 481 | Count Increasing Quadruplets | Hard | ArrayDynamic ProgrammingBinary Indexed Tree |
| 482 | Count Integers in Intervals | Hard | DesignSegment TreeOrdered Set |
| 483 | Count Integers With Even Digit Sum | Easy | MathSimulation |
| 484 | Count Items Matching a Rule | Easy | ArrayString |
| 485 | Count K-Subsequences of a String With Maximum Beauty | Hard | Hash TableMathString |
| 486 | Count Largest Group | Easy | Hash TableMath |
| 487 | Count Lattice Points Inside a Circle | Medium | ArrayHash TableMath |
| 488 | Count Mentions Per User | Medium | ArrayMathSorting |
| 489 | Count Negative Numbers in a Sorted Matrix | Easy | ArrayBinary SearchMatrix |
| 490 | Count Nice Pairs in an Array | Medium | ArrayHash TableMath |
| 491 | Count Nodes Equal to Average of Subtree | Medium | TreeDepth-First SearchBinary Tree |
| 492 | Count Nodes Equal to Sum of Descendants | Medium | TreeDepth-First SearchBinary Tree |
| 493 | Count Nodes That Are Great Enough | Hard | Divide and ConquerTreeDepth-First Search |
| 494 | Count Nodes With the Highest Score | Medium | ArrayTreeDepth-First Search |
| 495 | Count Non-Decreasing Subarrays After K Operations | Hard | ArrayStackSegment Tree |
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