Preorder Traversal
Preorder traversal visits nodes in Root-Left-Right order. Useful for copying or serializing trees.
BeginnerTime: O(n)Space: O(h)
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## How Preorder Traversal Works
Preorder traversal visits nodes in the order: Root -> Left subtree -> Right subtree. This is useful for creating a copy of the tree or serializing it.
### Algorithm Steps:
1. Visit the current node (process/print it)
2. Recursively traverse the left subtree
3. Recursively traverse the right subtree
### Key Characteristics:
- **Root first**: Always processes root before children
- **Tree copying**: Useful for duplicating tree structure
- **Prefix expression**: Creates prefix 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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