{"title":"SRM409 div1 medium","url":"https://a-kawashiro.hatenablog.com/entry/20110501/1304227801","type":"rich","description":"\u5206\u304b\u3089\u3078\u3093\u304b\u3063\u305f\u3002 class MagicalSpheres { public: int count(int n,int p) { int r=0; while(n>1) { r+=n/p; n/=p; } return r; } bool check(int s,int f,int g) { for(int i=2;1<g;) { if(g%i==0) { int e=0; while(g%i==0) e++,g/=i; int c=count(s+f,i)-count(s,i)-count(f,i); if(c<e) return false; } i++; if(g<i*i) i=g; \u2026","author_name":"a_kawashiro","width":"100%","categories":["topcoder"],"version":"1.0","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fa-kawashiro.hatenablog.com%2Fentry%2F20110501%2F1304227801\" title=\"SRM409 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>","provider_url":"https://hatena.blog","height":"190","image_url":null,"published":"2011-05-01 14:30:01","blog_url":"https://a-kawashiro.hatenablog.com/","blog_title":"a_kawashiro\u306e\u30d6\u30ed\u30b0","provider_name":"Hatena Blog","author_url":"https://blog.hatena.ne.jp/a_kawashiro/"}