jeneshicc https://blog.hatena.ne.jp/jeneshicc/ 落書き、時々落学 https://jeneshicc.hatenadiary.org/ Project Euler Haskell Java C++ http://projecteuler.net/index.php?section=problems&id=153とりあえず書いたが、速く動かない。（10^8ってかなり大きい気がするんですが。） import Number import Data.List -- ナーイブな実装 divisors n = [(a,b)| a <- [1..n], b <- [0..n-1], mod (n*a) (a*a+b*b) == 0, mod (n*b) (a*a+b*b) == 0] sumDiv = sum.map f.divisors where f (a,b) | b == 0 = a | ot… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fjeneshicc.hatenadiary.org%2Fentry%2F20081221%2F1229880435" title="Problem 153 - 落書き、時々落学" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2008-12-21 02:27:15 rich https://jeneshicc.hatenadiary.org/entry/20081221/1229880435 1.0 100%