15 lines
517 B
MiniZinc
15 lines
517 B
MiniZinc
predicate fzn_network_flow(array[int,1..2] of int: arc,
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array[int] of int: balance,
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array[int] of var int: flow) =
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let { int: source_node = 1;
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int: sink_node = 2;
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set of int: ARCS = index_set_1of2(arc);
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set of int: NODES = index_set(balance);
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} in
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forall (i in NODES) (
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sum (j in ARCS where i == arc[j,source_node]) (flow[j]) -
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sum (j in ARCS where i == arc[j,sink_node]) (flow[j])
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= balance[i]
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);
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