public class TreeNode {
int val = 0;
TreeNode left = null;
TreeNode right = null;
public TreeNode(int val) {
this.val = val;
}
}
public class Solution {
public void Mirror(TreeNode root) {
if(root==null)return ;
else{
TreeNode tmp=new TreeNode(0);
tmp=root.left;
root.left=root.right;
root.right=tmp;
Mirror(root.left);
Mirror(root.right);
}
}
}