{"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fa-kawashiro.hatenablog.com%2Fentry%2F20110409%2F1302329871\" title=\"SRM466 div1 medium - a_kawashiro\u306e\u30d6\u30ed\u30b0\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","author_url":"https://blog.hatena.ne.jp/a_kawashiro/","published":"2011-04-09 15:17:51","blog_url":"https://a-kawashiro.hatenablog.com/","image_url":null,"provider_url":"https://hatena.blog","blog_title":"a_kawashiro\u306e\u30d6\u30ed\u30b0","height":"190","url":"https://a-kawashiro.hatenablog.com/entry/20110409/1302329871","description":"class LotteryPyaterochka{ public: double chanceToWin(int N) { double n=N; return (10.0*(5*n-5)*(5*n-6)/2+5*(5*n-5)+1.0)*n*120/((5*n)*(5*n-1)*(5*n-2)*(5*n-3)*(5*n-4)); } };","author_name":"a_kawashiro","title":"SRM466 div1 medium","provider_name":"Hatena Blog","version":"1.0","type":"rich","width":"100%","categories":["topcoder"]}