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  1. ;; (import (chicken string))
  2. (define (product xs . rest)
  3.   (define (prod xs ys)
  4.     (reverse (foldl (lambda (acc x) (foldl (lambda (acc y) (cons (list x y) acc)) acc ys)) '() xs)))
  5.   (map flatten (foldl prod xs rest)))
  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.   (if (< n 1)
  14.       '()
  15.       (apply product (repeat (string-chop s 1) n))))
  16. (print (f "ABC" 0))
  17. (print (f "ABC" 1))
  18. (print (f "ABC" 2))
  19. (print (f "ABC" 3))
  20.  
Success #stdin #stdout 0.01s 7936KB
comments (?)
stdin 
Standard input is empty
stdout 
()
((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/feYtNB
language:
Scheme (chicken 4.13)
created:
12 days ago
visibility:
secret

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