Leetcode题解 226. Invert Binary Tree
2016-06-18 13:52
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Invert a binary tree.
to
用递归实现
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.
4 / \ 2 7 / \ / \ 1 3 6 9
to
4 / \ 7 2 / \ / \ 9 6 3 1
用递归实现
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(null==root){ return root; } invertTree(root.left); invertTree(root.right); TreeNode temp=root.left; root.left=root.right; root.right=temp; return root; } }
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