easyNeetCode 150
Diameter of Binary Tree
Return the diameter (longest path in edges) of a binary tree. Example: [1,2,3,4,5] => 3
Diameter of Binary Tree teaches the post-order trick that powers half of all tree problems: each node returns its height while a side variable tracks the best answer seen. The path that matters rarely runs through the root, so a top-down count fails. Once the height-plus-side-effect pattern clicks, max-path-sum feels familiar.
TreesBFS / DFS
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