Hello,
I'm trying to introduce the following constraint in my model: let x
be a set of variables (an IntVarArray) and y a proper subset (a slice)
of them, I want to know how many variables in y get values among a given
set of values. Problem is: I want to implement this as a "soft"
constraint, i.e. I want to minimize/maximize the number of times this
condition is satisfied, but without actually posting the constraint.
I have tried with reified membership constraints, but apart from
reification (that did exactly what I wanted it to do), they actually
post propagators and thus prune my search space. I have tried counting
constraints as well, but none of them matches the semantics I need, so I
suspect that this kind of constraint cannot simply be expressed, am I wrong?
Thanks,
Tommaso
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