Practice problems across 75+ categories
Practice problems frequently asked at Facebook • 275 problems | 55 Easy | 175 Medium | 42 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 31 | Circular Permutation in Binary Representation | Medium | MathBacktrackingBit Manipulation |
| 32 | Closest Binary Search Tree Value | Easy | Binary SearchTreeDepth-First Search |
| 33 | Clumsy Factorial | Medium | MathStackSimulation |
| 34 | Combination Sum | Medium | ArrayBacktracking |
| 35 | Concatenation of Consecutive Binary Numbers | Medium | MathBit ManipulationSimulation |
| 36 | Confusing Number | Easy | Math |
| 37 | Consecutive Available Seats | Easy | Database |
| 38 | Construct Binary Search Tree from Preorder Traversal | Medium | ArrayStackTree |
| 39 | Construct Binary Tree from String | Medium | StringStackTree |
| 40 | Construct String from Binary Tree | Medium | StringTreeDepth-First Search |
| 41 | Continuous Subarray Sum | Medium | ArrayHash TableMath |
| 42 | Convert Binary Search Tree to Sorted Doubly Linked List | Medium | Linked ListStackTree |
| 43 | Convert BST to Greater Tree | Medium | TreeDepth-First SearchBinary Search Tree |
| 44 | Convert Sorted Array to Binary Search Tree | Easy | ArrayDivide and ConquerTree |
| 45 | Count Complete Tree Nodes | Easy | Binary SearchBit ManipulationTree |
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