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binary_tree_inorder_traversal /기초
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var inorderTraversal = function (root) {
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const result = [];
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const traverse = (node) => {
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if (node === null) return;
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traverse(node.left); // 왼쪽 서브트리 방문
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result.push(node.val); // 현재 노드 방문
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traverse(node.right); // 오른쪽 서브트리 방문
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};
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traverse(root);
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return result;
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};

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