剑指offer---二叉树的镜像

/*
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)
return;
TreeNode *tmp = pRoot->left;
pRoot->left = pRoot->right;
pRoot->right = tmp;

if(pRoot->left)
Mirror(pRoot->left);
if(pRoot->right)
Mirror(pRoot->right);
}
};