Invert Binary Tree

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Solution Guide: Invert Binary Tree

Approach

Recursively invert children first, then swap node.left and node.right.

Complexity Analysis

Time
O(n) where n is node count
Space
O(h) where h is tree height

Pattern

Tree Transformation

Why It Works

Every node is independent: swapping both children at each node flips the entire subtree.

Updated Feb 2026