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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; }} 转载地址：http://bbuvb.baihongyu.com/