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Grokking the Coding Interview Patterns in Go

Solution: Invert Binary Tree

Explore how to invert a binary tree by applying a post-order depth-first search that swaps left and right subtrees at each node. Learn to implement this transformation efficiently in Go and analyze its linear time complexity and space use based on tree height.

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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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