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Grokking the Coding Interview Patterns in Python

Solution: Invert Binary Tree

Explore how to invert a binary tree by performing a post-order depth-first traversal. Understand the step-by-step recursive approach to swap left and right children of each node, creating a mirror image of the original tree. This lesson helps you grasp how recursion and tree traversal work in binary tree manipulation, while considering time and space complexity trade-offs for efficient solutions.

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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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