226. 翻转二叉树 - 力扣(LeetCode)(点击前面链接即可查看题目)
一、题目
给你一棵二叉树的根节点
root
,翻转这棵二叉树,并返回其根节点。示例 1:
输入:root = [4,2,7,1,3,6,9] 输出:[4,7,2,9,6,3,1]示例 2:
输入:root = [2,1,3] 输出:[2,3,1]示例 3:
输入:root = [] 输出:[]提示:
- 树中节点数目范围在
[0, 100]
内-100 <= Node.val <= 100
二、解题思路以及代码
这个题比较简单,原根将左边复制放在新创建的根右边即可。另一边同理
/*** Definition for a binary tree node.* struct TreeNode {* int val;* struct TreeNode *left;* struct TreeNode *right;* };*/
struct TreeNode* invertTree(struct TreeNode* root)
{if(NULL == root)return NULL;struct TreeNode* newnode = (struct TreeNode*)malloc(sizeof(struct TreeNode));newnode->val = root->val;newnode->left = invertTree(root->right);newnode->right = invertTree(root->left);return newnode;
}