jeneshicc https://blog.hatena.ne.jp/jeneshicc/ 落書き、時々落学 https://jeneshicc.hatenadiary.org/ Project Euler Haskell http://projecteuler.net/index.php?section=problems&id=112 ナイーブな実装。遅くないので、よしとする。 map2 f xs = zipWith f xs $ tail xs descend, ascend :: Integer -> Bool descend = and.map2 (>=).show ascend = and.map2 (<=).show main = print.snd.head.filter f.scanl add (0,1) $ [1..] where f (n,d) = 100*n == d add (m,_) x… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fjeneshicc.hatenadiary.org%2Fentry%2F20081128%2F1227868165" title="Problem 112 - 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 2008-11-28 19:29:25 rich https://jeneshicc.hatenadiary.org/entry/20081128/1227868165 1.0 100%