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=145 とりあえずナイーブなもの。 import Data.Char revInt ::Integer -> Integer revInt = read.reverse.show reversible n = mod n 10 /= 0 && (all odd.map digitToInt.show.(+n).revInt) n p145 n = filter reversible [1..n] main = print.length.p145$10^5 もちろん解けない（計算時間的な意… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fjeneshicc.hatenadiary.org%2Fentry%2F20081210%2F1228928328" title="Problem 145 - 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 2008-12-10 01:58:48 rich https://jeneshicc.hatenadiary.org/entry/20081210/1228928328 1.0 100%