Practice problems across 75+ categories
Practice problems frequently asked at Binary Tree • 177 problems | 37 Easy | 122 Medium | 17 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 166 | Symmetric Tree | Easy | TreeDepth-First SearchBreadth-First Search |
| 167 | Trim a Binary Search Tree | Medium | TreeDepth-First SearchBinary Search Tree |
| 168 | Two Sum BSTs | Medium | Two PointersBinary SearchStack |
| 169 | Two Sum IV - Input is a BST | Unknown | Hash TableTwo PointersTree |
| 170 | Unique Binary Search Trees | Medium | MathDynamic ProgrammingTree |
| 171 | Unique Binary Search Trees II | Medium | Dynamic ProgrammingBacktrackingTree |
| 172 | Univalued Binary Tree | Easy | TreeDepth-First SearchBreadth-First Search |
| 173 | Validate Binary Search Tree | Medium | TreeDepth-First SearchBinary Search Tree |
| 174 | Validate Binary Tree Nodes | Medium | TreeDepth-First SearchBreadth-First Search |
| 175 | Verify Preorder Sequence in Binary Search Tree | Medium | ArrayStackTree |
| 176 | Verify Preorder Serialization of a Binary Tree | Medium | StringStackTree |
| 177 | Vertical Order Traversal of a Binary Tree | Hard | Hash TableTreeDepth-First Search |
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