{"description":"\u554f\u984c yukicoder.me \u89e3\u8aac \u554f\u984c\u3067\u306f\u300c\u8272\u3092\u5857\u308b\u300d\u2192\u300c\u30dc\u30fc\u30eb\u3092\u9078\u3076\u300d\u306e\u9806\u756a\u3067\u3059\u304c\u3053\u308c\u3092\u5165\u308c\u66ff\u3048\u307e\u3059. \u3059\u306a\u308f\u3061, \u4ee5\u4e0b\u306e\u554f\u984c\u3092\u89e3\u304d\u307e\u3059. $N$ \u500b\u306e\u30dc\u30fc\u30eb\u306e\u3046\u3061\u3044\u304f\u3064\u304b\u3092\u9078\u3073\u307e\u3059. \u9078\u3093\u3060\u30dc\u30fc\u30eb\u306b\u767b\u5834\u3059\u308b\u8272\u306e\u6570\u304c\u3061\u3087\u3046\u3069 $K$\u306b\u306a\u308b\u3088\u3046\u306a\u5857\u308a\u65b9\u306e\u901a\u308a\u6570\u3092\u9078\u3073\u65b9\u5168\u3066\u306b\u5bfe\u3057\u3066\u8db3\u3057\u5408\u308f\u305b\u3066\u304f\u3060\u3055\u3044. \u9078\u3076\u500b\u6570 $n$ \u3092\u56fa\u5b9a\u3057\u307e\u3059. \u3053\u306e\u3068\u304d, \u30dc\u30fc\u30eb\u306e\u9078\u3073\u65b9\u306f $\\displaystyle\\binom{N}{n}$ \u901a\u308a, \u8272\u306e\u9078\u3073\u65b9\u306f $\\displaystyle\\binom{M}{K}$ \u901a\u308a, \u8272\u306e\u5857\u308a\u65b9\u306f $K! S_{2}(n,K)$ \u901a\u308a\u3067\u3059. \u305f\u3060\u3057, $S_{2}$ \u306f\u2026","height":"190","author_url":"https://blog.hatena.ne.jp/nonon_math/","version":"1.0","blog_title":"nonon\u306e\u843d\u66f8\u304d\u5e33","provider_name":"Hatena Blog","width":"100%","url":"https://nononmath.hatenablog.com/entry/2024/05/01/200358","author_name":"nonon_math","image_url":null,"provider_url":"https://hatena.blog","categories":[],"type":"rich","published":"2024-05-01 20:03:58","blog_url":"https://nononmath.hatenablog.com/","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fnononmath.hatenablog.com%2Fentry%2F2024%2F05%2F01%2F200358\" title=\"Yukicoder No.1321 \u5857\u308b\u3081\u305f \u3092\u89e3\u304f - nonon\u306e\u843d\u66f8\u304d\u5e33\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","title":"Yukicoder No.1321 \u5857\u308b\u3081\u305f \u3092\u89e3\u304f"}