18. 二叉树的镜像

题目描述
操作给定的二叉树,将其变换为源二叉树的镜像。


思路
根据源二叉树镜像的定义,交换每个节点的左子树和右子树


代码实现

# -*- coding:utf-8 -*-
# class TreeNode:
#     def __init__(self, x):
#         self.val = x
#         self.left = None
#         self.right = None
class Solution:
    # 返回镜像树的根节点
    def Mirror(self, root):
        # write code here
        if (root == None or (root.left == None and root.right == None)):
            return root
        else:
            temp = root.left
            root.left = root.right
            root.right = temp
        if(root.left):
            self.Mirror(root.left)
        if(root.right):
            self.Mirror(root.right)