jsprit - 限制车辆数量 JSPRIT

Question

如何设置路线中涉及的固定车辆数量的约束？我在正确实现 StateManager 和 ConstraintManager 时遇到了一些问题，我可以举一些这类实现的例子（StateManager 和 ConstraintManager 的 main 很短）吗？

Answer 1

要设置固定/有限数量的车辆，您需要通过以下方式设置车辆类型：

VehicleTypeImpl.Builder vehicleTypeBuilder = VehicleTypeImpl.Builder.newInstance("vehicleType").addCapacityDimension(0, 2);
VehicleType vehicleType = vehicleTypeBuilder.build();
VehicleImpl.Builder vehicleBuilder = VehicleImpl.Builder.newInstance("vehicle");
vehicleBuilder.setStartLocation(loc(Coordinate.newInstance(10, 10)));
vehicleBuilder.setType(vehicleType);
VehicleImpl vehicle = vehicleBuilder.build();

然后通过以下方式构建问题：

VehicleRoutingProblem.Builder vrpBuilder = VehicleRoutingProblem.Builder.newInstance();
vrpBuilder.addVehicle(vehicle).setFleetSize(VehicleRoutingProblem.FleetSize.INFINITE);

现在，如果您想设置有限数量的车辆，您必须使用：VehicleRoutingProblem.FleetSize.FINITE

要添加车辆，请使用：

            int nuOfVehicles = 13;
            for (int i = 0; i < nuOfVehicles; i++) {
            VehicleType vehicleType = VehicleTypeImpl.Builder.newInstance(depotCounter + "_type")
                .addCapacityDimension(0, capacity).setCostPerDistance(1.0).build();
            String vehicleId = depotCounter + "_" + (i + 1) + "_vehicle";
            VehicleImpl.Builder vehicleBuilder = VehicleImpl.Builder.newInstance(vehicleId);
            vehicleBuilder.setStartLocation(Location.newInstance(depotCoord.getX(), depotCoord.getY()));
            vehicleBuilder.setType(vehicleType);
            vehicleBuilder.setLatestArrival(maxDuration);
            VehicleImpl vehicle = vehicleBuilder.build();
            vrpBuilder.addVehicle(vehicle);
        }