Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 376 | Count Covered Buildings | Medium | ArrayHash TableSorting |
| 377 | Count Days Without Meetings | Medium | ArraySorting |
| 378 | Count Different Palindromic Subsequences | Hard | StringDynamic Programming |
| 379 | Count Distinct Numbers on Board | Easy | ArrayHash TableMath |
| 380 | Count Elements With Maximum Frequency | Easy | ArrayHash TableCounting |
| 381 | Count Elements With Strictly Smaller and Greater Elements | Easy | ArraySortingCounting |
| 382 | Count Equal and Divisible Pairs in an Array | Easy | Array |
| 383 | Count Fertile Pyramids in a Land | Hard | ArrayDynamic ProgrammingMatrix |
| 384 | Count Good Meals | Medium | ArrayHash Table |
| 385 | Count Good Nodes in Binary Tree | Medium | TreeDepth-First SearchBreadth-First Search |
| 386 | Count Good Numbers | Medium | MathRecursion |
| 387 | Count Good Triplets | Easy | ArrayEnumeration |
| 388 | Count Good Triplets in an Array | Hard | ArrayBinary SearchDivide and Conquer |
| 389 | Count Hills and Valleys in an Array | Easy | Array |
| 390 | Count Houses in a Circular Street II | Hard | ArrayTwo Pointers |
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