{"type":"rich","image_url":null,"height":"190","description":"http://projecteuler.net/index.php?section=problems&id=170 \u5fd9\u3057\u3044\u3068\u3044\u3044\u3064\u3064\u3082\u3002 \u5408\u9593\u306b\u3084\u3063\u3066\u308b\u3060\u3051\u3060\u3088\u3002\u3068\u8a00\u3044\u8a33\u3002 \u6700\u5927\u3092\u63a2\u3059\u306e\u3067\u30019876543210\u304b\u3089\u9006\u8f9e\u66f8\u5f0f\u9806\u306b\u63a2\u7d22\u3002 \u6700\u521d\u306e\u6570\u306f3\u306e\u500d\u6570\u306750\u672a\u6e80\u3060\u3068\u5206\u304b\u308b\u3002\uff0810\u6841\u5236\u7d04\uff09 \u591a\u5206\u3001\u89e3\u306f98????????\u306e\u5f62\u3002 \u3059\u308b\u3068\u3001\u6574\u6570\u306f3\u3064\u306b\u306a\u308a\u3001\u306f\u3058\u3081\u306e1\u3064\u306f2\u6841\u3002 import Data.List permutation :: Eq a => [a] -> [[a]] permutation [] = [[]] permutation xs = [y:ys | y <- xs, ys \u2026","blog_url":"https://jeneshicc.hatenadiary.org/","author_name":"jeneshicc","version":"1.0","author_url":"https://blog.hatena.ne.jp/jeneshicc/","categories":["Project Euler","Haskell"],"published":"2009-01-11 15:44:03","url":"https://jeneshicc.hatenadiary.org/entry/20090111/1231656243","provider_name":"Hatena Blog","blog_title":"\u843d\u66f8\u304d\u3001\u6642\u3005\u843d\u5b66","provider_url":"https://hatena.blog","title":"Problem 170","width":"100%","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fjeneshicc.hatenadiary.org%2Fentry%2F20090111%2F1231656243\" title=\"Problem 170 - \u843d\u66f8\u304d\u3001\u6642\u3005\u843d\u5b66\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>"}