参考回答：
public class Solution {public void Mirror(TreeNode root) {if(root==null){return;}TreeNode temp = root.left;root.left = root.right;root.right = temp;Mirror(root.left);Mirror(root.right);}}
参考回答：
public class Solution {public void Mirror(TreeNode root) {if(root==null){return;}TreeNode temp = root.left;root.left = root.right;root.right = temp;Mirror(root.left);Mirror(root.right);}}
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