剑指offer_18

二叉树的镜像定义：源二叉树 
    	    8
    	   /  
    	  6   10
    	 /   / 
    	5  7 9 11
    	镜像二叉树
    	    8
    	   /  
    	  10   6
    	 /   / 
    	11 9 7  5

public class TreeNode {
    int val = 0;
    TreeNode left = null;
    TreeNode right = null;
    public TreeNode(int val) {
        this.val = val;
    }
}
*/
public class  {
    public void Mirror(TreeNode root) {
        TreeNode aux = null;
        if(root != null){
            aux = root.left;
            root.left = root.right;
            root.right = aux;
            
            Mirror(root.left);
            Mirror(root.right);
        }
    }
}