如何将域变量添加到 global_cardinality? [英] How to add domain variable to global_cardinality?

问题描述

我正在尝试将约束 global_cardinality 添加到我的程序和 SICStus Prolog 手册 是这样写的:

I'm trying to add a constraint global_cardinality to my program and in the manual of SICStus Prolog is written:

global_cardinality(+Xs,+Vals)

global_cardinality(+Xs,+Vals)

global_cardinality(+Xs,+Vals,+Options)

global_cardinality(+Xs,+Vals,+Options)

其中 Xs = [X1,...,Xd] 是整数或域变量的列表，并且Vals = [K1-V1,...,Kn-Vn] 是一个对的列表，其中每个键 Ki 是一个唯一整数，Vi 是域变量或整数.真如果Xs 的每个元素都等于某个键，并且对于每对 Ki-Vi，Xs 的 Vi 元素正好等于 Ki.

where Xs = [X1,...,Xd] is a list of integers or domain variables, and Vals = [K1-V1,...,Kn-Vn] is a list of pairs where each key Ki is a unique integer and Vi is a domain variable or an integer. True if every element of Xs is equal to some key and for each pair Ki-Vi, exactly Vi elements of Xs are equal to Ki.

现在我可以写了:

global_cardinality([A,B,C], [1-2, 2-1]).

表示数字 1 将被使用两次.数字 2 将只使用一次.

to say that the number 1 will be used twice. The number 2 will be used just once.

但是我想说1这个数字会被用到:一次、两次或三次

But I would like to say that the number 1 will be used: once, twice or three times

根据手册，我需要一个域变量，但正确的语法是什么?

According to the manual I need a domain variable but what is the proper syntax for that?

推荐答案

对此不确定，但来自 SWI-Prolog 页面 我想你可以试试

not sure about this, but from SWI-Prolog page I think you could try

...global_cardinality([A,B,C], [1-X, 2-1]), (X #= 1 #\/ X #= 2 #\/ X #= 2)...

或

?- global_cardinality([A,B,C], [1-X, 2-1]), X in 1..3, label([A,B,C]).
A = B, B = 1,
C = X, X = 2 ;
A = C, C = 1,
B = X, X = 2 ;
A = X, X = 2,
B = C, C = 1.

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