Jip J. Dekker
fad1b07018
git-subtree-dir: software/minizinc git-subtree-split: 4f10c82056ffcb1041d7ffef29d77a7eef92cf76
19 lines
975 B
MiniZinc
19 lines
975 B
MiniZinc
include "fzn_dag.mzn";
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include "fzn_dag_reif.mzn";
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/** @group globals.graph
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Constrains the subgraph \a ns and \a es of a given directed graph to be a DAG.
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@param from: the leaving node for each edge
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@param to: the entering node for each edge
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@param ns: a Boolean for each node whether it is in the subgraph
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@param es: a Boolean for each edge whether it is in the subgraph
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*/
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predicate dag(array[int] of $$N: from, array[int] of $$N: to,
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array[$$N] of var bool: ns, array[int] of var bool: es) =
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assert(index_set(from) = index_set(to),"dreachable: index set of from and to must be identical") /\
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assert(index_set(from) = index_set(es),"dreachable: index set of from and es must be identical") /\
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assert(dom_array(from) subset index_set(ns),"dreachable: nodes in from must be in index set of ns") /\
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assert(dom_array(from) subset index_set(ns),"dreachable: nodes in to must be in index set of ns") /\
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fzn_dag(from,to,ns,es);
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