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