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binary-tree-maximum-path-sum.java

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public class Solution {

private int max;

public int maxPathSum(TreeNode root) {

max = Integer.MIN_VALUE;

if (root == null) {

return 0;

}

search(root);

return max;

}

private int search(TreeNode node) {

if (node == null) {

return 0;

}

int maxLeft = search(node.left);

int maxRight = search(node.right);

int choice1 = maxLeft + maxRight + node.val;

int choice2 = maxLeft + node.val;

int choice3 = maxRight + node.val;

int choice4 = node.val;

int bestChoice = Math.max(choice1, Math.max(choice2, Math.max(choice3, choice4)));

max = Math.max(max, bestChoice);

return Math.max(choice4, Math.max(choice2, choice3));

}

}