剑指offer 编程题（17）：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。
输入描述:
二叉树的镜像定义：

/*struct TreeNode {    int val;    struct TreeNode *left;    struct TreeNode *right;    TreeNode(int x) :            val(x), left(NULL), right(NULL) {    }};*/class Solution {public:    void Mirror(TreeNode *pRoot) {        if(pRoot == NULL)        {            return;        }        TreeNode *tem = NULL;        tem = pRoot->left;        pRoot->left = pRoot->right;        pRoot->right = tem;        Mirror(pRoot->left);        Mirror(pRoot->right);    }};

class Solution {public:    void Mirror(TreeNode *p) {    if(p){            swap(p -> left, p -> right);            Mirror(p -> left);            Mirror(p -> right);        }    }};