Practice problems across 75+ categories
Practice problems frequently asked at Tree • 252 problems | 41 Easy | 150 Medium | 60 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 241 | Tree of Coprimes | Hard | ArrayMathTree |
| 242 | Trim a Binary Search Tree | Medium | TreeDepth-First SearchBinary Search Tree |
| 243 | Two Sum BSTs | Medium | Two PointersBinary SearchStack |
| 244 | Two Sum IV - Input is a BST | Unknown | Hash TableTwo PointersTree |
| 245 | Unique Binary Search Trees | Medium | MathDynamic ProgrammingTree |
| 246 | Unique Binary Search Trees II | Medium | Dynamic ProgrammingBacktrackingTree |
| 247 | Univalued Binary Tree | Easy | TreeDepth-First SearchBreadth-First Search |
| 248 | Validate Binary Search Tree | Medium | TreeDepth-First SearchBinary Search Tree |
| 249 | Validate Binary Tree Nodes | Medium | TreeDepth-First SearchBreadth-First Search |
| 250 | Verify Preorder Sequence in Binary Search Tree | Medium | ArrayStackTree |
| 251 | Verify Preorder Serialization of a Binary Tree | Medium | StringStackTree |
| 252 | Vertical Order Traversal of a Binary Tree | Hard | Hash TableTreeDepth-First Search |
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