Symmetric Tree

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Solution Guide: Symmetric Tree

Approach

Compare two opposite branches recursively and ensure each pair of nodes mirrors value and structure.

Complexity Analysis

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

Pattern

Tree Symmetry Check

Why It Works

A tree is symmetric only if left subtree and right subtree are mirror images at every level.

Updated Mar 2026