norisuke3 https://blog.hatena.ne.jp/norisuke3/ From a Far East Island https://norisuke3.hatenadiary.org/ (define (copy items condition) (if (null? items) items (if (condition (car items)) (cons (car items) (copy (cdr items) condition)) (copy (cdr items) condition)))) (define (same-parity . items) (copy items (if (even? (car items)) even? odd?))) 汎用の条件式を取れるcopyを作成しておいて、same-parity用の条件をcopyに渡すようにしてみた。最初自… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fnorisuke3.hatenadiary.org%2Fentry%2F20070914%2F1189737148" title=" 問題2.20 ドット末尾記法 - From a Far East Island" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2007-09-14 11:32:28 rich https://norisuke3.hatenadiary.org/entry/20070914/1189737148 1.0 100%