Practice problems across 75+ categories
Practice problems frequently asked at Google • 3407 problems | 851 Easy | 1775 Medium | 761 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 166 | Binary Tree Inorder Traversal | Easy | StackTreeDepth-First Search |
| 167 | Binary Tree Level Order Traversal | Medium | TreeBreadth-First SearchBinary Tree |
| 168 | Binary Tree Level Order Traversal II | Medium | TreeBreadth-First SearchBinary Tree |
| 169 | Binary Tree Longest Consecutive Sequence | Medium | TreeDepth-First SearchBinary Tree |
| 170 | Binary Tree Longest Consecutive Sequence II | Medium | TreeDepth-First SearchBinary Tree |
| 171 | Binary Tree Maximum Path Sum | Hard | Dynamic ProgrammingTreeDepth-First Search |
| 172 | Binary Tree Nodes | Medium | Database |
| 173 | Binary Tree Paths | Easy | StringBacktrackingTree |
| 174 | Binary Tree Postorder Traversal | Easy | StackTreeDepth-First Search |
| 175 | Binary Tree Preorder Traversal | Easy | StackTreeDepth-First Search |
| 176 | Binary Tree Pruning | Medium | TreeDepth-First SearchBinary Tree |
| 177 | Binary Tree Right Side View | Medium | TreeDepth-First SearchBreadth-First Search |
| 178 | Binary Tree Tilt | Easy | TreeDepth-First SearchBinary Tree |
| 179 | Binary Tree Upside Down | Medium | TreeDepth-First SearchBinary Tree |
| 180 | Binary Tree Vertical Order Traversal | Medium | Hash TableTreeDepth-First Search |
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