Practice problems across 75+ categories
Practice problems frequently asked at Facebook • 275 problems | 55 Easy | 175 Medium | 42 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 16 | Binary String With Substrings Representing 1 To N | Medium | Hash TableStringBit Manipulation |
| 17 | Binary Tree Paths | Easy | StringBacktrackingTree |
| 18 | Binary Tree Pruning | Medium | TreeDepth-First SearchBinary Tree |
| 19 | Binary Tree Tilt | Easy | TreeDepth-First SearchBinary Tree |
| 20 | Binary Tree Vertical Order Traversal | Medium | Hash TableTreeDepth-First Search |
| 21 | Binary Trees With Factors | Medium | ArrayHash TableDynamic Programming |
| 22 | Bitwise ORs of Subarrays | Medium | ArrayDynamic ProgrammingBit Manipulation |
| 23 | Boats to Save People | Medium | ArrayTwo PointersGreedy |
| 24 | Brace Expansion | Unknown | StringBacktrackingStack |
| 25 | Camelcase Matching | Medium | ArrayTwo PointersString |
| 26 | Check If a String Contains All Binary Codes of Size K | Medium | Hash TableStringBit Manipulation |
| 27 | Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree | Medium | TreeDepth-First SearchBreadth-First Search |
| 28 | Check If Array Pairs Are Divisible by k | Medium | ArrayHash TableCounting |
| 29 | Check If Word Is Valid After Substitutions | Medium | StringStack |
| 30 | Cherry Pickup II | Hard | ArrayDynamic ProgrammingMatrix |
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