Diameter of Binary Tree

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Solution Guide: Diameter of Binary Tree

Approach

During depth-first traversal, update diameter as leftHeight + rightHeight at each node and return max subtree height.

Complexity Analysis

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

Pattern

Tree DP via DFS

Why It Works

Each node contributes a candidate diameter through its left and right heights.

Updated Feb 2026