{"height":"190","provider_name":"Hatena Blog","image_url":null,"url":"https://inamori.hateblo.jp/entry/20090302/p1","blog_url":"https://inamori.hateblo.jp/","categories":["\u6570\u5b66","\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0","C++"],"blog_title":"inamori\u2019s diary","published":"2009-03-02 00:00:00","author_name":"inamori","author_url":"https://blog.hatena.ne.jp/inamori/","description":"\u5927\u304d\u306a\u6574\u6570\u306e\u639b\u3051\u7b97\u306b\u306fFFT\u3092\u4f7f\u3046\u3068\u3088\u3044\u306e\u3060\u305d\u3046\u3060\u3002\u591a\u9805\u5f0f\u306e\u639b\u3051\u7b97\u3092\u8003\u3048\u308c\u3070\u3088\u3044\u3002 f(x) = a0 + a1x + ... + amxm g(x) = b0 + b1x + ... + bnxn \u5404\u9805\u306e\u4fc2\u6570\u306f\u3001\u7573\u8fbc\u307f\u3067\u8a08\u7b97\u3067\u304d\u308b\u3002\u7573\u8fbc\u307f\u306f\u30d5\u30fc\u30ea\u30a8\u5909\u63db\u3059\u308b\u3068\u5358\u306a\u308b\u639b\u3051\u7b97\u306b\u5909\u308f\u308b\u3002\u3053\u308c\u3092\u307e\u305f\u9006\u5909\u63db\u3059\u308b\u3002\u8a08\u7b97\u91cf\u306f\u3001\u9805\u6570\u3092n\u3068\u3059\u308b\u3068\u3001\u3075\u3064\u3046\u306b\u639b\u3051\u7b97\u3059\u308c\u3070O(n2)\u3002\u30d5\u30fc\u30ea\u30a8\u5909\u63db\u306bFFT\u3092\u4f7f\u3046\u3068\u3001O(nlogn)\u7a0b\u5ea6\uff08\u672c\u5f53\u306f\u9055\u3046\u3089\u3057\u3044\u304c\u3001\u5b9f\u7528\u7684\u306b\u306f\u554f\u984c\u306a\u3044\u3060\u308d\u3046\uff09\u306a\u306e\u3067\u3001\u3053\u3061\u3089\u306e\u307b\u3046\u304c\u901f\u304f\u306a\u308b\u3002\u3057\u304b\u3057\u3001\u6574\u6570\u306e\u30d5\u30fc\u30ea\u30a8\u5909\u63db\u306f\u3069\u306e\u3088\u3046\u306b\u3057\u305f\u3089\u3044\u3044\u306e\u3060\u308d\u3046\u304b\u3002 \u305d\u3046\u601d\u3063\u3066\u691c\u7d22\u3057\u3066\u307f\u305f\u3089\u3001\u3084\u3063\u3071\u308a\u5b9f\u6570\u8a08\u7b97\u3057\u2026","width":"100%","title":"\u6574\u6570\u306e\u30d5\u30fc\u30ea\u30a8\u5909\u63db\uff081\uff09","version":"1.0","provider_url":"https://hatena.blog","type":"rich","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Finamori.hateblo.jp%2Fentry%2F20090302%2Fp1\" title=\"\u6574\u6570\u306e\u30d5\u30fc\u30ea\u30a8\u5909\u63db\uff081\uff09 - inamori\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>"}