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package ch14;
import datatype.TreeNode;
public class P56_1 {
// 각 노드의 값을 설정하기 위한 변수 선언
int val = 0;
public TreeNode bstToGst(TreeNode root) {
if (root != null) {
// 오른쪽 자식 노드부터 탐색
bstToGst(root.right);
// 누적된 값에 현재 노드 값 추가
val += root.val;
// 현재 노드 값을 지금까지 누적된 값으로 할당
root.val = val;
// 왼쪽 자식 노드 탐색
bstToGst(root.left);
}
return root;
}
}
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