Jip J. Dekker
f2a1c4e389
git-subtree-dir: software/mza git-subtree-split: f970a59b177c13ca3dd8aaef8cc6681d83b7e813
20 lines
721 B
MiniZinc
20 lines
721 B
MiniZinc
%-----------------------------------------------------------------------------%
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% 'all_different' constrains an array of objects to be all different.
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%
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% Linear version: equality encoding; see e.g. [Refalo, CP 2000]
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%
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% For a given d in dom(x), at most one i with x_i = d can exist.
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%-----------------------------------------------------------------------------%
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include "domain_encodings.mzn";
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predicate all_different_int(array[int] of var int: x) =
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let {
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array[int,int] of var 0..1: x_eq_d = eq_encode(x)
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} in (
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forall(d in index_set_2of2(x_eq_d))( sum(i in index_set_1of2(x_eq_d))( x_eq_d[i,d] ) <= 1 )
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);
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%-----------------------------------------------------------------------------%
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