Practice problems across 75+ categories
Practice problems frequently asked at Facebook • 275 problems | 55 Easy | 175 Medium | 42 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 46 | Count Houses in a Circular Street | Easy | ArrayInteractive |
| 47 | Count Number of Nice Subarrays | Medium | ArrayHash TableMath |
| 48 | Count Palindromic Subsequences | Hard | StringDynamic Programming |
| 49 | Count Vowels Permutation | Hard | Dynamic Programming |
| 50 | Cousins in Binary Tree | Easy | TreeDepth-First SearchBreadth-First Search |
| 51 | Curry | Medium | JavaScript |
| 52 | Decrease Elements To Make Array Zigzag | Medium | ArrayGreedy |
| 53 | Delete Columns to Make Sorted II | Medium | ArrayStringGreedy |
| 54 | Delete N Nodes After M Nodes of a Linked List | Easy | Linked List |
| 55 | Delete Nodes And Return Forest | Medium | ArrayHash TableTree |
| 56 | Determine if String Halves Are Alike | Easy | StringCounting |
| 57 | Diagonal Traverse II | Medium | ArraySortingHeap (Priority Queue) |
| 58 | Distribute Candies to People | Easy | MathSimulation |
| 59 | Divide Array in Sets of K Consecutive Numbers | Medium | ArrayHash TableGreedy |
| 60 | Divide Chocolate | Hard | ArrayBinary Search |
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