public IEnumerable <Arc> GetConnectionCriticalArcs()
{
for (int i = Problem.MachineCount;
i < Problem.MachineAndConnectionCount;
i++)
{
var order = _sequences[i];
if (order.Count <= 1)
{
continue;
}
Assert(SequencingChecks, order.Count == 2);
Assert(SequencingChecks, order.All(occ => occ.Type != MachineOccupationType.Normal));
if (order.First().Type == MachineOccupationType.ConnectionOrigin)
{
continue;
}
Assert(SequencingChecks,
order.First().Type == MachineOccupationType.ConnectionTarget &&
order.Last().Type == MachineOccupationType.ConnectionOrigin);
var arc = Arc.BetweenOccupations(order.First(), order.Last());
Assert(SequencingChecks, GraphLayer.ArcExists(arc));
yield return(arc);
}
}