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Grokking the Coding Interview Patterns in C++

Solution: Invert Binary Tree

Explore how to invert a binary tree by performing a post-order depth-first traversal that swaps left and right subtrees at each node. Understand the linear time complexity and space complexity based on tree height. This lesson helps you implement and analyze an efficient binary tree transformation algorithm.

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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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