Tree: Depth-First Search - Invert Binary Tree
Which traversal method is most suitable for implementing a function that swaps the left and right children of every node in a binary tree to produce its mirror image?
Which traversal method is most suitable for implementing a function that swaps the left and right children of every node in a binary tree to produce its mirror image?
easy💻 Programming Q1 of Q15
Step-by-Step Solution
Solution:
Step 1: Choose traversal order for swapping children
Post-order traversal processes children before the parent, ensuring children are inverted before swapping.Step 2: Swap children after recursive calls
At each node, swap left and right children after recursive calls to children.Final Answer:
Option B -> Option BQuick Check:
Children inverted before parent swap [OK]
Quick Trick: Swap children after recursive calls using post-order [OK]
Common Mistakes:
MISTAKES- Using in-order or pre-order causes partial or incorrect inversion
- Assuming level-order traversal is sufficient for inversion
Trap Explanation:
PITFALL- In-order or pre-order may swap children before they are inverted, causing incorrect results.
Interviewer Note:
CONTEXT- Tests understanding of traversal order impact on tree inversion.
Master "Invert Binary Tree" in Tree: Depth-First Search
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