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=157 150番あたりの問題にしては簡単。 import Control.Monad import Number import Data.List divisor100 n = [2^x*5^y | x <-[0..2*n], y <- [0..2*n]] primitiveSolutions n = filter (uncurry (<=)) [(div (m^2) d + m, m + d) | d <- divisor100 n] where m = 10^n solutions … 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fjeneshicc.hatenadiary.org%2Fentry%2F20081224%2F1230130718" title="Problem 157 - 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 2008-12-24 23:58:38 rich https://jeneshicc.hatenadiary.org/entry/20081224/1230130718 1.0 100%