【Grind75Hard】10問目124. Binary Tree Maximum Path Sum #69
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nodchip
approved these changes
Jun 3, 2024
| # 子を2つ持てるのは根だけ | ||
| class Solution: | ||
| def maxPathSum(self, root: Optional[TreeNode]) -> int: | ||
| max_sum = -float("inf") |
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leetcode上だと関係ないのですが、floatはimportなしで使えるため使用していました。
math.infを使うようにします。
oda
reviewed
Jun 3, 2024
| return 0, max_sum | ||
| left_sum, max_sum = helper(node.left, max_sum) | ||
| right_sum, max_sum = helper(node.right, max_sum) | ||
| max_sum = max(max_sum, node.val + left_sum + right_sum) |
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私の想定は、分散処理を考えて下みたいなのでしたが、これでもいいです。
left_sum, left_max_sum = helper(node.left)
right_sum, right_max_sum = helper(node.right)
max_sum = max(left_max_sum, right_max_sum, node.val + left_sum + right_sum)
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ありがとうございます。
変数を分けた方が読みやすい気がしました。
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問題
https://leetcode.com/problems/binary-tree-maximum-path-sum/