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package ch14;

import datatype.TreeNode;

public class P57_1 {

public int rangeSumBST(TreeNode root, int low, int high) {

// 예외 처리

if (root == null) return 0;

// 결과 변수

int result = 0;

// 현재 노드의 값이 low와 high 사이에 있다면 결과에 추가

if (low <= root.val && root.val <= high)

result = root.val;

// 자식 노드 재귀 DFS 진행

result += rangeSumBST(root.left, low, high);

result += rangeSumBST(root.right, low, high);

return result;

}

}