{"author_url":"https://blog.hatena.ne.jp/tanakaBox/","description":"Vim\u3054\u3068\u843d\u3061\u305f\u3002\u5931\u6557\u3002Problem 24 - PukiWiki (define (permutations s) (define (flatmap proc seq) (apply append (map proc seq))) (define (remove-1 item sequence) (cond ((null? sequence) '()) ((equal? (car sequence) item) (cdr sequence)) (else (cons (car sequence) (remove-1 item (cdr sequence)))))) (if (null? s)\u2026","provider_name":"Hatena Blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fboxnos.hatenablog.com%2Fentry%2F20080407%2F1207566084\" title=\" Problem 24 - \u9806\u5217(1) - \u30dc\u30af\u30ce\u30b9\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","height":"190","published":"2008-04-07 20:01:24","title":" Problem 24 - \u9806\u5217(1)","image_url":null,"blog_title":"\u30dc\u30af\u30ce\u30b9","provider_url":"https://hatena.blog","type":"rich","version":"1.0","author_name":"tanakaBox","width":"100%","categories":["Scheme"],"blog_url":"https://boxnos.hatenablog.com/","url":"https://boxnos.hatenablog.com/entry/20080407/1207566084"}