{"blog_url":"https://kiririmode.hatenablog.jp/","height":"190","description":"\u554f\u984c3-16\u3067\u51fa\u3066\u304d\u305f count-pairs \u3092\uff0c\u540c\u3058 pair \u3092\u91cd\u8907\u3057\u3066\u6570\u3048\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u3088\u3046\u5909\u66f4\u3059\u308b\u554f\u984c\uff0e (not (not-include ...))\u306b\u6df1\u3044\u610f\u5473\u306f\u306a\u3044\uff0e (use srfi-1) (define (count-pairs x) (define (not-include? elem l) (not (find (lambda (x) (eq? x elem)) l))) (define sight '()) (define (count-pairs-only-sight x) (cond ((not (pair? x)) 0) ((not (not-include? \u2026","image_url":null,"version":"1.0","author_name":"kiririmode","width":"100%","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fkiririmode.hatenablog.jp%2Fentry%2F20080313%2Fp2\" title=\"\u554f\u984c3-17 (3.3.1  Mutable List Structure) - \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>","author_url":"https://blog.hatena.ne.jp/kiririmode/","provider_name":"Hatena Blog","title":"\u554f\u984c3-17 (3.3.1  Mutable List Structure)","url":"https://kiririmode.hatenablog.jp/entry/20080313/p2","categories":["SICP"],"type":"rich","published":"2008-03-13 00:00:01","blog_title":"\u7406\u7cfb\u5b66\u751f\u65e5\u8a18","provider_url":"https://hatena.blog"}