209. Minimum Size Subarray Sum #43
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tokuhirat
reviewed
Oct 5, 2025
| # @return {Integer} | ||
| def min_sub_array_len(target, nums) | ||
| min_size = Float::INFINITY | ||
| prefix_sum = 0 |
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prefix_sum というよりは subarray_sum かなと感じました。
tokuhirat
reviewed
Oct 5, 2025
| # @param {Integer[]} nums | ||
| # @return {Integer} | ||
| def min_sub_array_len(target, nums) | ||
| min_size = Float::INFINITY |
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初期値は難しいところですが選択肢の一つとして以下のパターンもありだとは思いました。
NOT_FOUND = nums.size + 1
min_size = NOT_FOUND
...
min_size == NOT_FOUND ? 0 : min_size
potrue
reviewed
Oct 5, 2025
| end | ||
| prefix_sum += num | ||
| end | ||
| min_size == Float::INFINITY ? 0 : min_size |
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いいと思います。
別の書き方としては、while trueで二つのポインタを回すような書き方もあると思いました。
Owner
Author
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Rubyらしいというのもありますが、必ずrightは1ずつ動くのでわざわざ自分で+1する必要もないかな、と思いこの書き方しています。
ただ、ポインタを使った方がsliding windowらしいのでそれもアリかもしれません。
コメントありがとうございます。
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解いた問題
209. Minimum Size Subarray Sum
使用言語
Ruby
次に解く問題
https://leetcode.com/problems/permutations/