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LiveAI Interview • DSA

30:42

Invert Binary Tree

Given the root of a binary tree, invert the tree, and return its root.

4 4 / \ => / \ 2 7 7 2 / \ / \ / \ / \ 1 3 6 9 9 6 3 1

RizzInterviewsElegant! Swapping the children before recursing is highly efficient.

solution.py

class Solution:
    def invertTree(self, root):
        if not root:
            return None

        temp = root.left
        root.left = root.right
        root.right = temp

        self.invertTree(root.left)
        self.invertTree(root.right)

        return root

"Time complexity is O(n) since every node is visited once. Space is O(h) for the recursive stack—best case O(log n), worst case O(n)."

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