peroon https://blog.hatena.ne.jp/peroon/ perogram https://perogram.hateblo.jp/ yukicoder 累積和 Quiz https://yukicoder.me/problems/no/754 Submission https://yukicoder.me/submissions/350209 解法 N=3で書いてみると以下の和を求めればいいと分かる 配列AかBの累積和を持っておけば、和はO(N)で求められる 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fperogram.hateblo.jp%2Fentry%2F2019%2F06%2F05%2F150228" title="No.754 畳み込みの和 - perogram" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> https://cdn-ak.f.st-hatena.com/images/fotolife/p/peroon/20190605/20190605145930.jpg Hatena Blog https://hatena.blog 2019-06-05 15:02:28 rich https://perogram.hateblo.jp/entry/2019/06/05/150228 1.0 100%