Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 46 | All the Pairs With the Maximum Number of Common Followers | Medium | Database |
| 47 | All Valid Triplets That Can Represent a Country | Easy | Database |
| 48 | Allocate Mailboxes | Hard | ArrayMathDynamic Programming |
| 49 | Allow One Function Call | Easy | JavaScript |
| 50 | Alternating Digit Sum | Easy | Math |
| 51 | Alternating Groups I | Easy | ArraySliding Window |
| 52 | Alternating Groups II | Medium | ArraySliding Window |
| 53 | Alternating Groups III | Hard | ArrayBinary Indexed TreeOrdered Set |
| 54 | Amount of New Area Painted Each Day | Hard | ArraySegment TreeOrdered Set |
| 55 | Amount of Time for Binary Tree to Be Infected | Medium | Hash TableTreeDepth-First Search |
| 56 | Analyze Organization Hierarchy | Hard | Database |
| 57 | Analyze User Website Visit Pattern | Medium | ArrayHash TableString |
| 58 | Android Unlock Patterns | Medium | Dynamic ProgrammingBacktrackingBit Manipulation |
| 59 | Ant on the Boundary | Easy | ArraySimulationPrefix Sum |
| 60 | Append Characters to String to Make Subsequence | Medium | Two PointersStringGreedy |
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