Practice problems across 75+ categories
Practice problems frequently asked at Google • 3407 problems | 851 Easy | 1775 Medium | 761 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 466 | Count Different Palindromic Subsequences | Hard | StringDynamic Programming |
| 467 | Count Distinct Numbers on Board | Easy | ArrayHash TableMath |
| 468 | Count Elements With Maximum Frequency | Easy | ArrayHash TableCounting |
| 469 | Count Elements With Strictly Smaller and Greater Elements | Easy | ArraySortingCounting |
| 470 | Count Equal and Divisible Pairs in an Array | Easy | Array |
| 471 | Count Fertile Pyramids in a Land | Hard | ArrayDynamic ProgrammingMatrix |
| 472 | Count Good Meals | Medium | ArrayHash Table |
| 473 | Count Good Nodes in Binary Tree | Medium | TreeDepth-First SearchBreadth-First Search |
| 474 | Count Good Numbers | Medium | MathRecursion |
| 475 | Count Good Triplets | Easy | ArrayEnumeration |
| 476 | Count Good Triplets in an Array | Hard | ArrayBinary SearchDivide and Conquer |
| 477 | Count Hills and Valleys in an Array | Easy | Array |
| 478 | Count Houses in a Circular Street | Easy | ArrayInteractive |
| 479 | Count Houses in a Circular Street II | Hard | ArrayTwo Pointers |
| 480 | Count Increasing Quadruplets | Hard | ArrayDynamic ProgrammingBinary Indexed Tree |
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