I'm modeling a CVRPTW with some features:
Each type of vehicle has a cost per km and a fixed cost per trip. To calculate these costs, I am using these methods for this:
Each customer has a time window where they can be visited. I'm using this method for this:
solver.addConstraint(solver.makeNotMemberCt(transitTimeDimensionCumulVar, forbiddenWindow.starts, forbiddenWindow.ends)
So far, everything is working correctly but now, a requirement has arisen to add an extra fixed cost if a vehicle has been idle(slacking) for more than 4 hours at a customer. A vehicle can wait for the opening time of the next customer before leaving.
I'm in doubt about how I can add a fixed cost for SlackVar on each node or something like
Is it possible to add a fixed cost associated with each customer's SlackVar? This cost does not apply to waiting at the depot.
I'm using ORTools 7.6 with Java