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  1. ;; (import (chicken string))
  2. (define (product . lists)
  3.   (define (prod xs ys)
  4.     (reverse (foldl (lambda (acc x) (foldl (lambda (acc y) (cons (cons y x) acc)) acc ys)) '() xs)))
  5.   (map reverse (foldl prod '(()) lists)))
  6. (define (repeat x n)
  7.   (define (aux acc n)
  8.     (if (<= n 0)
  9.         acc
  10.         (aux (cons x acc) (- n 1))))
  11.   (aux '() n))
  12. (define (f s n)
  13.   (apply product (repeat (string-chop s 1) n)))
  14. (print (f "ABC" 0))
  15. (print (f "ABC" 1))
  16. (print (f "ABC" 2))
  17. (print (f "ABC" 3))
  18.  
Success #stdin #stdout 0.01s 8000KB
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(())
((A) (B) (C))
((A A) (A B) (A C) (B A) (B B) (B C) (C A) (C B) (C C))
((A A A) (A A B) (A A C) (A B A) (A B B) (A B C) (A C A) (A C B) (A C C) (B A A) (B A B) (B A C) (B B A) (B B B) (B B C) (B C A) (B C B) (B C C) (C A A) (C A B) (C A C) (C B A) (C B B) (C B C) (C C A) (C C B) (C C C))
https://ideone.com/A6K3XL
language:
Scheme (chicken 4.13)
created:
10 days ago
visibility:
secret

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