Elevator Simulation Problem

Edit only the function definition of Elevator.prototype.decide() in myelevator.js.
That function is called when elevator needs to decide which floor it needs to go to.
Try to:

1. minimize total_people_wait_time_in_elevator
2. minimize total_people_wait_time_out_elevator
3. minimize total_elevator_traveled_distance
4. maximize total_delivered_people