19 二叉树的镜像

操作给定的二叉树，将其变换为源二叉树的镜像。

C++:

/*
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 * t = pRoot->left ;
        pRoot->left = pRoot->right ;
        pRoot->right = t ;
        Mirror(pRoot->left) ;
        Mirror(pRoot->right) ;
    }
};