fork download
copy 
  1. ; keypad errors
  2.  
  3. (define (digits n . args)
  4.   (let ((b (if (null? args) 10 (car args))))
  5.     (let loop ((n n) (d '()))
  6.       (if (zero? n) d
  7.           (loop (quotient n b)
  8.                 (cons (modulo n b) d))))))
  9.  
  10. (define (remove x xs)
  11.   (let loop ((xs xs) (zs '()))
  12.     (cond ((null? xs) (reverse zs))
  13.           ((equal? (car xs) x) (loop (cdr xs) zs))
  14.           (else (loop (cdr xs) (cons (car xs) zs))))))
  15.  
  16. (define (range . args)
  17.   (case (length args)
  18.     ((1) (range 0 (car args) (if (negative? (car args)) -1 1)))
  19.     ((2) (range (car args) (cadr args) (if (< (car args) (cadr args)) 1 -1)))
  20.     ((3) (let ((le? (if (negative? (caddr args)) >= <=)))
  21.            (let loop ((x(car args)) (xs '()))
  22.              (if (le? (cadr args) x)
  23.                  (reverse xs)
  24.                  (loop (+ x (caddr args)) (cons x xs))))))
  25.     (else (error 'range "unrecognized arguments"))))
  26.  
  27. (define (match target keyed)
  28.   (let ((ts (digits target)) (ks (digits keyed)))
  29.     (if (equal? ts ks) #t
  30.       (let loop ((ds (range 10)))
  31.         (if (null? ds) #f
  32.           (if (equal? (remove (car ds) ts) ks) #t
  33.             (loop (cdr ds))))))))
  34.  
  35. (display (match 18684 164)) (newline)
  36. (display (match 17674 164)) (newline)
  37. (display (match 18684 165)) (newline)
  38. (display (match 18684 18685)) (newline); your code goes here
Success #stdin #stdout 0.04s 8792KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
#t
#t
#f
#f
https://ideone.com/EJJ7oR
language:
Scheme (guile 2.2.4)
created:
7 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!