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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Zebra-puzzle/Racket/zebra-puzzle.rkt Normal file
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#lang racket
(require racklog)
(define %select
(%rel (x xs S S1)
[(x (cons x xs) xs)]
[(x (cons S xs) (cons S S1)) (%select x xs S1)]
[((cons x xs) S)
(%select x S S1)
(%select xs S1)]
[('() (_))]))
(define %next-to
(%rel (A B C)
[(A B C)
(%or (%left-of A B C)
(%left-of B A C))]))
(define %left-of
(%rel (A B C)
[(A B C) (%append (_) (cons A (cons B (_))) C)]))
(define %zebra
(%rel (Owns HS)
[(Owns HS)
(%is HS (list (list (_) 'norwegian (_) (_) (_))
(_)
(list (_) (_) (_) 'milk (_))
(_) (_)))
(%select (list (list 'red 'englishman (_) (_) (_))
(list (_) 'swede 'dog (_) (_))
(list (_) 'dane (_) 'tea (_))
(list (_) 'german (_) (_) 'prince))
HS)
(%select (list (list (_) (_) 'birds (_) 'pallmall)
(list 'yellow (_) (_) (_) 'dunhill)
(list (_) (_) (_) 'beer 'bluemaster))
HS)
(%left-of (list 'green (_) (_) 'coffee (_))
(list 'white (_) (_) (_) (_))
HS)
(%next-to (list (_) (_) (_) (_) 'dunhill)
(list (_) (_) 'horse (_) (_))
HS)
(%next-to (list (_) (_) (_) (_) 'blend)
(list (_) (_) 'cats (_) (_))
HS)
(%next-to (list (_) (_) (_) (_) 'blend)
(list (_) (_) (_) 'water (_))
HS)
(%next-to (list (_) 'norwegian (_) (_) (_))
(list 'blue (_) (_) (_) (_))
HS)
(%member (list (_) Owns 'zebra (_) (_)) HS)]))
(%which (Who HS) (%zebra Who HS))