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Grokking the Coding Interview Patterns in Python

Solution: Invert Binary Tree

Understand how to invert a binary tree by applying a post-order depth-first search traversal. This lesson teaches you to recursively swap left and right children of each node, creating a mirror image of the original tree. You will also learn about the time and space complexity involved in this recursive solution.

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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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