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Posted by Anonymous on Sat 25 Oct 00:57
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  1. (define (no-repeating-digits max)
  2.   (filter (lambda (anum) (not (dup-char? (string->list (number->string anum)) empty)))
  3.           (mk-number-lst max empty)))
  4.  
  5. (define (mk-number-lst max alon)
  6.   (cond [(empty? alon) (mk-number-lst max (list 1))]
  7.         [(cons? alon) (cond [(>= (first alon) max) alon]
  8.                             [else (mk-number-lst max (cons (+ (first alon) 1) alon))])]))
  9.  
  10. (define (dup-char? top bottom)
  11.   (cond [(empty? top) false]
  12.         [(cons? top) (cond [(not (empty? (filter (lambda (achar) (char=? (first top) achar))
  13.                                                  (append (rest top) bottom)))) true]
  14.                            [else (dup-char? (rest top) (cons (first top) bottom))])]))

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