二叉树的镜像（无返回值）题解

二叉树的镜像（无返回值）

public class Solution {
    public void Mirror(TreeNode root) {
        recur(root);
    }
    private TreeNode recur(TreeNode root){
        if(root==null) return null;
        TreeNode temp = root.left;
        root.left = recur(root.right);
        root.right = recur(temp);
        return root;
    }
}