Postorder Traversal
Postorder traversal visits nodes in Left-Right-Root order. Useful for deleting trees.
BeginnerTime: O(n)Space: O(h)
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## How Postorder Traversal Works
Postorder traversal visits nodes in the order: Left subtree -> Right subtree -> Root. This is useful for deleting trees or evaluating expression trees.
### Algorithm Steps:
1. Recursively traverse the left subtree
2. Recursively traverse the right subtree
3. Visit the current node (process/print it)
### Key Characteristics:
- **Children first**: Always processes children before parent
- **Tree deletion**: Safe way to delete tree (children deleted before parent)
- **Postfix expression**: Creates postfix notation for expression trees
Time & Space Complexity
| Case | Time Complexity |
|---|---|
| Best | O(n) |
| Average | O(n) |
| Worst | O(n) |
| Space | O(h) |
Practice Problems
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