Binary Tree Maximum Path Sum
Binary Tree Maximum Path Sum
题目链接：https://leetcode.com/problems...
dfs对每个node，查一下包含这个node的最大路径值。
/*** Definition for a binary tree node.* public class TreeNode {* int val;* TreeNode left;* TreeNode right;* TreeNode(int x) { val = x; }* }*/
public class Solution {public int maxPathSum(TreeNode root) {dfs(root);return globalMax;}int globalMax = Integer.MIN_VALUE;private int dfs(TreeNode root) {// base caseif(root == null) return 0;int left = Math.max(0, dfs(root.left));int right = Math.max(0, dfs(root.right));globalMax = Math.max(globalMax, left + right + root.val);return Math.max(left, right) + root.val;}
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