电梯程序。等候电梯队列采用链表，每进一个人增加一个结点。电梯则用结构体，包括多个参数。函数包括，主函数,opening(),opened(),waiting(),closing(),closed(),moving(),ran_floor()(随机产生等待电梯的人)-Lift program. Waiting for the elevator queue using linked lists, each into a person to add a node. Elevator structural body including a plurality of parameters. Functions, including the main function, opening (), opened (), waiting (), the closing (), closed (), moving (), ran_floor () (randomly generated waiting for the elevator)