{"type":"rich","description":"\u30b3\u30e1\u30f3\u30bf\u30ea\u30fc\u898b\u3066\u306a\u3093\u3068\u306a\u304f\u3046\u308c\u3057\u304f\u306a\u308a\u307e\u3057\u305f\u3002 \u554f\u984c No.278 \u9023\u7d9a\u3059\u308b\u6574\u6570\u306e\u548c(2) - yukicoder \u89e3\u6cd5 n \u304b\u3089\u59cb\u307e\u308b N \u500b\u306e\u6574\u6570\u306e\u548c\u306f, n + (n+1) + ... + (n+N-1) = Nn + N(N-1)/2\u3068\u306a\u308a\u307e\u3059\u3002X \u306f, \u4efb\u610f\u306e n \u306b\u3064\u3044\u3066\u4e0a\u8a18\u306e\u5024\u306e\u7d04\u6570\u306b\u306a\u3063\u3066\u3044\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u3053\u306e\u3088\u3046\u306a X \u306f, N \u3068 N(N-1)/2 \u306e\u6700\u5927\u516c\u7d04\u6570\u304a\u3088\u3073\u305d\u306e\u7d04\u6570\u3067\u3059\u3002\u3088\u3063\u3066, \u3053\u306e\u7d04\u6570\u306e\u548c\u3092\u6c42\u3081\u308c\u3070\u826f\u3044\u3067\u3059\u3002\u305f\u3060 C++ \u3060\u3068 N(N-1)/2 \u3092\u6c42\u3081\u308b\u969b\u306b\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3057\u3066\u3057\u307e\u3046\u306e\u3067\u5076\u5947\u3067\u5834\u5408\u5206\u3051\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3054\u307e\u304b\u3057\u3066\u66f8\u3044\u305f python \u30b3\u30fc\u30c9\u2026","url":"https://mayokoex.hatenablog.com/entry/2015/09/05/085334","height":"190","author_name":"mayokoex","blog_url":"https://mayokoex.hatenablog.com/","provider_url":"https://hatena.blog","image_url":null,"width":"100%","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fmayokoex.hatenablog.com%2Fentry%2F2015%2F09%2F05%2F085334\" title=\"yukicoder No.278 \u9023\u7d9a\u3059\u308b\u6574\u6570\u306e\u548c(2) - mayoko\u2019s diary\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","categories":[],"blog_title":"mayoko\u2019s diary","published":"2015-09-05 08:53:34","title":"yukicoder No.278 \u9023\u7d9a\u3059\u308b\u6574\u6570\u306e\u548c(2)","author_url":"https://blog.hatena.ne.jp/mayokoex/","version":"1.0","provider_name":"Hatena Blog"}