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Grokking the Coding Interview Patterns in JavaScript

Solution: Invert Binary Tree

Explore how to transform a binary tree into its mirror image by recursively swapping left and right subtrees using post-order depth-first search. Understand the linear time complexity and space usage based on tree height as you apply this pattern to solve similar coding interview problems.

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Statement

Given the root node of a binary tree, transform the tree by swapping each node’s left and right subtrees, thus creating a mirror image of the original tree. Return the root of the transformed tree.

Constraints:

  • 0≤0\leq Number of nodes in the tree ≤100\leq 100
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