{"url":"https://mzp.hatenadiary.org/entry/20090512/fib","description":"30\u5206\u30d7\u30ed\u30b0\u30e9\u30e0\u3001\u305d\u306e581\u3002\u5bfe\u6570\u30b9\u30c6\u30c3\u30d7\u3067\u30d5\u30a3\u30dc\u30ca\u30c3\u30c1\u6570\u3092\u8a08\u7b97\u3067\u304d\u308b\u3089\u3057\u3044\u306e\u3067\u3001\u3084\u3063\u3066\u307f\u308b\u3002 SICP\u306e\u6f14\u7fd2\u554f\u984c\u3067\u62c5\u5f53\u306b\u306a\u3063\u305f\u3068\u3053\u308d\u306b\u3001\u30d5\u30a3\u30dc\u30ca\u30c3\u30c1\u6570\u3092\u5bfe\u6570\u30b9\u30c6\u30c3\u30d7\u3067\u8a08\u7b97\u3059\u308b\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u304c\u8f09\u3063\u3066\u3044\u305f\u306e\u3067\u8a66\u3057\u3066\u307f\u305f\u3002\u3068\u308a\u3042\u3048\u305a\u3001\u914d\u5e03\u8cc7\u6599\u3092\u8cbc\u3063\u3066\u7f6e\u304d\u307e\u3059\u306d\u3002 \u5bfe\u6570\u30b9\u30c6\u30c3\u30d7\u3067\u30d5\u30a3\u30dc\u30ca\u30c3\u30c1\u6570\u3092\u8a08\u7b97\u3059\u308b\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u304c\u5b58\u5728\u3059\u308b\u3002fib-iter\u3067\u306faa := a + b\u3001b := a\u3068\u3044\u3046\u5909\u5f62\u3092\u884c\u306a\u3063\u3066\u3044\u305f\u3002 \u3053\u306e\u5909\u5f62\u3092T\u3068\u547c\u3076\u3068\u3001T\u306fn\u56de\u9069\u7528\u3055\u308c\u3066\u3044\u308b\u3002 \u3064\u307e\u308a\u3001(1,0)\u306bT^n\u3092\u9069\u7528\u3059\u308b\u3068\u3001Fib(n+1)\u3068Fib(n)\u304c\u5f97\u3089\u308c\u308b\u3002\u3053\u3053\u3067\u3001T\u3092 a := bq + aq + ap b := bp \u2026","type":"rich","categories":["Haskell","30\u5206\u30d7\u30ed\u30b0\u30e9\u30e0"],"published":"2009-05-12 00:00:00","author_name":"mzp","blog_url":"https://mzp.hatenadiary.org/","provider_name":"Hatena Blog","version":"1.0","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fmzp.hatenadiary.org%2Fentry%2F20090512%2Ffib\" title=\"\u5bfe\u6570\u30b9\u30c6\u30c3\u30d7\u3067\u30d5\u30a3\u30dc\u30ca\u30c3\u30c1\u6570\u3092\u8a08\u7b97\u3059\u308b - \u307f\u305a\u3074\u30fc\u65e5\u8a18\" 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","width":"100%","height":"190","title":"\u5bfe\u6570\u30b9\u30c6\u30c3\u30d7\u3067\u30d5\u30a3\u30dc\u30ca\u30c3\u30c1\u6570\u3092\u8a08\u7b97\u3059\u308b","blog_title":"\u307f\u305a\u3074\u30fc\u65e5\u8a18","author_url":"https://blog.hatena.ne.jp/mzp/","image_url":null}