n9d https://blog.hatena.ne.jp/n9d/ 計算機と戯れる日々 https://n9d.hatenadiary.org/ まあ、そのまま。 sortByなりmaximumByなりがData.Ordのcomparingを使わないといけないのがrubyと比較して面倒 import Data.List import Data.Ord main = print $ p p = maximumBy (comparing length) $ group $ sort [x+y+z|x<-[1..998],y<-[x..998-x],z<-[y..998-x-y],x<=y,y<z,z^2==x^2+y^2] 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fn9d.hatenadiary.org%2Fentry%2F20110925%2Fp2" title="problem39 - 計算機と戯れる日々" 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 2011-09-25 00:00:01 rich https://n9d.hatenadiary.org/entry/20110925/p2 1.0 100%