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Given a binary tree, find the maximum path sum.
The path may start and end at any node in the tree.
For example:
Given the below binary tree,
1 / 2 3
Return 6
.
解题思路:
DFS暴力枚举,注意,如果采用static 全局变量的话,在IDE里面是可以通过,但在OJ上无法测试通过,因此需要建立一个类来储存结果,JAVA实现如下:
public class Solution { static public int maxPathSum(TreeNode root) { Result result=new Result(Integer.MIN_VALUE); dfs(root,result); return result.val; } static int dfs(TreeNode root,Result result) { if (root == null) return 0; int left_sum = Math.max(0, dfs(root.left,result)); int right_sum = Math.max(0, dfs(root.right,result)); result.val = Math.max(result.val, left_sum + right_sum + root.val); return Math.max(left_sum, right_sum) + root.val; } } class Result{ int val; Result(){ this.val=Integer.MIN_VALUE; } Result(int val){ this.val=val; } }
Java for LeetCode 124 Binary Tree Maximum Path Sum
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原文地址:http://www.cnblogs.com/tonyluis/p/4531152.html