17 lines
571 B
MiniZinc
17 lines
571 B
MiniZinc
predicate fzn_value_precede_set(int: s, int: t, array[int] of var set of int: x) =
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let {
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int: imin = min(index_set(x)),
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int: imax = max(index_set(x)),
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array[imin..imax + 1] of var bool: b
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} in (
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forall (i in imin..imax) (
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let {
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var bool: xis = (s in x[i] /\ not (t in x[i]))
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} in
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(xis -> (b[i + 1] == true))
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/\ ((not xis) -> (b[i] == b[i + 1]))
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/\ ((not b[i]) -> (s in x[i] \/ not (t in x[i])))
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)
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/\ b[imin] == false
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);
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