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Solution.cs
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33 lines (32 loc) · 958 Bytes
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/**
* Definition for a binary tree node.
* public class TreeNode {
* public int val;
* public TreeNode left;
* public TreeNode right;
* public TreeNode(int val=0, TreeNode left=null, TreeNode right=null) {
* this.val = val;
* this.left = left;
* this.right = right;
* }
* }
*/
public class Solution
{
public int MaxPathSum(TreeNode root)
{
int maxSum = int.MinValue;
DFS(root, ref maxSum);
return maxSum;
}
public int DFS(TreeNode root, ref int ans)
{
if (root == null) return int.MinValue / 3;
int leftMax = DFS(root.left, ref ans);
int rightMax = DFS(root.right, ref ans);
int maxSum = Math.Max(root.val, Math.Max(root.val + leftMax, root.val + rightMax));
ans = Math.Max(ans, Math.Max(leftMax, rightMax));
ans = Math.Max(ans, Math.Max(maxSum, root.val + leftMax + rightMax));
return maxSum;
}
}