这个代码是一个停车场管理系统，关于数据结构的实验，实现停车计费功能，若停车场满了就停在便道里，停车场出去一辆车，便道进去一辆车-This code is a parking management system, experiments on data structures, parking meter, the parking lot full of parked on the sidewalk, parking out of a car, the sidewalk inside a car

停车场里经常碰到车对车的情况，有时候车停的还很深。这能最大化地增加停车场停的车的数量，但是车主的车被停在一大排的车后面。在这种情况下，所有的车要离开来让要出去的车离开-Parking lot attendants often park cars bumper-to-bumper, several cars deep. This maximizes the number of cars they can fit into a parking lot at the expense of compli