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#lang at-exp racket
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(require "csp.rkt" rackunit)
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#|
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(define creduce (assign-val ($csp (list ($var 'a '(1 2 3)) ($var 'b '(2 3)) ($var 'c '(1 2 3 4 5))) (list ($constraint '(a b c) (procedure-rename (λ (a b c) (= (+ a b c) 4)) 'summer)))) 'a 1))
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(check-equal?
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(make-arcs-consistent (reduce-constraint-arity creduce))
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($csp (list ($var 'a '(1)) ($var 'b '(2)) ($var 'c '(1))) '()))
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(define f (λ (a b c d) (+ a b c d)))
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(check-equal? 10 ((reduce-arity f '(1 b c d)) 2 3 4))
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(check-equal? 10 ((reduce-arity f '(1 2 c d)) 3 4))
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(check-equal? 10 ((reduce-arity f '(1 2 3 d)) 4))
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(check-equal? 10 ((reduce-arity f '(1 b 3 d)) 2 4))
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(check-equal? 10 ((reduce-arity f '(a b 3 d)) 1 2 4))
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|#
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(define c1 ($csp (list ($var 'a '(1 2)) ($var 'b '(1 2 3)) ($var 'c '(1 3 4 5))) (list ($constraint '(a b c) alldiff))))
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(assign-val c1 'b 3)
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(define c2 ($csp (list ($var 'a '(1 2)) ($var 'b '(1 2 3)) ($var 'c '(1 3 4 5))) null))
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(add-pairwise-constraint! c2 alldiff '(a b c))
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(assign-val c2 'b 3)
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