题解 | #牛群的树形结构展开II#
牛群的树形结构展开II
https://www.nowcoder.com/practice/3e89ca58f76d4e6aa44cf29569017410
import java.util.*;
/*
* public class TreeNode {
* int val = 0;
* TreeNode left = null;
* TreeNode right = null;
* public TreeNode(int val) {
* this.val = val;
* }
* }
*/
public class Solution {
/**
* 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
*
*
* @param root TreeNode类
* @return TreeNode类
*/
public TreeNode flattenII (TreeNode root) {
// write code here
TreeNode result = new TreeNode(-1);
TreeNode temp = result;
inOrder(root,temp);
return result.right;
}
public TreeNode inOrder(TreeNode node,TreeNode target){
if(node == null){
return target;
}
target = inOrder(node.left,target);
target.right = new TreeNode(node.val);
target = target.right;
target = inOrder(node.right,target);
return target;
}
}
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