Invert Binary Tree

题目链接
Google: 90% of our engineers use the software you wrote (Homebrew), but you can’t invert a binary tree on a whiteboard so fuck off.

/** * Definition for a binary tree node. * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(int x) { val = x; } * } */
public class Solution {
    public TreeNode invertTree(TreeNode root) {
         if(root!=null)
        {

        TreeNode A=root.left;
        root.left=root.right;
        root.right=A;
        invertTree(root.left);
        invertTree(root.right);
        }
        return root;
    }
}

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