停车场管理问题

设有一个可以停放n辆汽车的狭长停车场，它只有一个大门可以供车辆进出。车辆按到达停车场时间的早晚依次从停车场最里面向大门口处停放(最先到达的第一辆车放在停车场的最里面)。-There is a car park management vehicles can be parked n the long and narrow parking lot, it can be only one door for vehicular access. Vehicles to reach the car park by the time sooner or later followed by the most from the car park inside the main door to the big park (the first arrival of the first car on the parking lot of the inside).