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=164 これは簡単。表を埋めるだけの簡単なお仕事。 import Data.Array m = 20 f = listArray ((1,0,0),(m,9,9)).map g.range $ ((1,0,0),(m,9,9)) where g (1,a,b) = 10 - (a+b) g (n+1,a,b) = sum[f!(n,b,c)| c <- [0..9-(a+b)]] main = print.sum$[f!(m-2,a,b)| a<-[1..9], b<-[0..9]] 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fjeneshicc.hatenadiary.org%2Fentry%2F20081231%2F1230707649" title="Problem 164 - 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 2008-12-31 16:14:09 rich https://jeneshicc.hatenadiary.org/entry/20081231/1230707649 1.0 100%