题目描述
操作给定的二叉树，将其变换为源二叉树的镜像。

class Solution {
public:
    void Mirror(TreeNode *pRoot) {
        if(pRoot == NULL)
            return;
        if(pRoot->left==NULL&&pRoot->right==NULL)
            return;
        TreeNode* p = pRoot->left;
        pRoot->left = pRoot->right;
        pRoot->right = p;
        if(pRoot->left)
            Mirror(pRoot->left);
        if(pRoot->right)
            Mirror(pRoot->right);
    }
};