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124_maxPathSum.java

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/**

* 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 max = Integer.MIN_VALUE;// not 0!!!!

public int maxPathSum(TreeNode root) {

oneSide(root);

return max;

}

public int oneSide(TreeNode root){

if(root == null) return 0;

int left = Math.max(0, oneSide(root.left));

int right = Math.max(0, oneSide(root.right));

max = Math.max(max, root.val + left + right);

return root.val + Math.max(left, right);

}

}