3、　　某商场有一个100个车位的停车场，当车位未满时，等待的车辆可以进入并计时；当车位已满时，必须有车辆离开，等待的车辆才能进入；当车辆离开时计算停留的的时间，并且按照每小时1元收费。

汽车的输入信息格式可以是（进入/离开，车牌号，进入/离开时间），要求可以随时显示停车场内的车辆信息以及收费历史记录

- a mall has a 100-space car park, when parking spaces under the vehicle waiting to enter and timing　when parking is full, you must leave a vehicle, a vehicle waiting to enter　calculated when the vehicle left the residence the time and costs in accordance with one yuan per hour. Enter the information format cars can be (enter/leave, license plate number, entry/departure time), requirements can be displayed at any time vehicle history information, and parking fees within