相关疑难解决方法(0)

我在阅读dr drcket的输出时遇到了麻烦.默认情况下,它使用mcons显示列表.例如,sicp exercise 2.32产生:

> (subsets (list 1 2 3))
(mcons
 (mcons
  '()
  (mcons
   (mcons 3 '())
   (mcons
    (mcons 2 '())
    (mcons
     (mcons 2 (mcons 3 '()))
     (mcons
      (mcons 1 '())
      (mcons
       (mcons 1 (mcons 3 '()))
       (mcons
        (mcons 1 (mcons 2 '()))
        (mcons (mcons 1 (mcons 2 (mcons 3 '()))) '()))))))))
 '())

我读这篇文章时遇到了麻烦.有没有办法使输出看起来像:

 (() (3) (2) (2 3) (1) (1 3) (1 2) (1 2 3))

谢谢!