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test
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/**
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* Definition for a binary tree node.
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* function TreeNode(val, left, right) {
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* this.val = (val===undefined ? 0 : val)
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* this.left = (left===undefined ? null : left)
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* this.right = (right===undefined ? null : right)
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* }
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*/
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/**
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* @param {TreeNode} root
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* @return {number}
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*/
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var diameterOfBinaryTree = function(root) {
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function depth(node) {
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//node 가 null이면?
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// 왼쪽 깊이 구하기
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// 오른쪽 깊이 구하기
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// 현재 노드를 거치는 경로 길이 확인
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// 부모에게는 무엇을 return 해야할까?
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}
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depth(root);
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// 최종 return
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};

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