{"published":"2007-12-08 00:00:01","image_url":null,"provider_name":"Hatena Blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fkiririmode.hatenablog.jp%2Fentry%2F20071208%2Fp2\" title=\"\u554f\u984c2-41 (2.2.3  Sequences as Conventional Interfaces) - \u7406\u7cfb\u5b66\u751f\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>","blog_url":"https://kiririmode.hatenablog.jp/","categories":["SICP"],"version":"1.0","blog_title":"\u7406\u7cfb\u5b66\u751f\u65e5\u8a18","height":"190","url":"https://kiririmode.hatenablog.jp/entry/20071208/p2","description":"\u4eca\u65e5\u306f\u3001\u8db3\u3057\u3066s\u306b\u306a\u308b\u3088\u3046\u306a3\u3064\u7d44\u3092\u3082\u3068\u3081\u308b\u3002 ordered\u3067distinct\u3063\u3066\u6307\u5b9a\u306a\u3093\u3067\u30013\u3064\u7d44(i, j, k)\u306fk ; \u6628\u65e5\u306e (define (enumerate-interval low high) (if (> low high) () (cons low (enumerate-interval (+ low 1) high)))) ; \u6628\u65e5\u306e (define (unique-pairs n) (flatmap (lambda (i) (map (lambda (j) (list i j)) (enumerate-interval 1 (- i 1)))) (enumerate\u2026","provider_url":"https://hatena.blog","title":"\u554f\u984c2-41 (2.2.3  Sequences as Conventional Interfaces)","type":"rich","author_url":"https://blog.hatena.ne.jp/kiririmode/","width":"100%","author_name":"kiririmode"}