LeetCode 543 - Diameter of Binary Tree | Python | Visually Explained

Solve LeetCode 543 — Diameter of Binary Tree in under 3 minutes. The diameter is the number of edges on the longest path between any two nodes, and that path doesn't have to go through the root. The fix: use postorder traversal to visit every node, compute left depth + right depth as the candidate diameter, and track the global maximum. Time O(n), Space O(h). Clean, simple, no tricks.

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