Question

操作给定的二叉树，将其变换为源二叉树的镜像。

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