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/*
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) { //一个函数就够
if(pRoot==nullptr)
return;
if(pRoot->left==nullptr&&pRoot->right==nullptr )//左右都是空节点以及到头了
return;
TreeNode *temp=pRoot->left;
pRoot->left= pRoot->right;
pRoot->right=temp;
if(pRoot->left!=nullptr)
Mirror(pRoot->left);
if(pRoot->right!=nullptr)
Mirror(pRoot->right);
}
};