设停车场是一个可停放n辆车的狭长通道，且只有一个大门可供汽车进出。在停车场内，汽车按到达的先后次序，由北向南依次排列（假设大门在最南端）。-Parking lots is a car parked n the narrow channel, and only one gate for vehicle access. In the parking lot, the car arrived at the order, from north to south in order of priority