题目内容：使用队列模拟理发馆的排队现象，通过仿真手法评估其营业状况。

基本要求：

假设理发馆内设有N把理发椅，可同时为N位顾客进行理发。对于在营业时间(假设为T小时)内进门的顾客：

*当顾客进门时，若有空椅，则可以立即坐下理发，否则需要依次排队等候。

*一旦有顾客理完发离去时，排在队头的顾客便可开始理发。

*若理发馆每天连续营业T小时，求一天内顾客在理发馆内的平均逗留时间

*顾客排队等候的队列平均长度。

*营业时间到点后仍需完成服务的收尾工作时间。-topics as : the use of cohort simulation barber's shop, the queues, through simulation methods to assess its financial situation. Basic requirement : Suppose N Barber Library has put barber chairs, as well as for customers, N barber. For hours (assuming T-hour) entering customers : * When customers come through the door, if empty chairs, they can sit down barber immediately, otherwise needs were queuing up. * Once customers Jimmy End made to leave, the first in the queue of customers will start barber. * If the Barber Museum consecutive business day T-hour day for customers in the barbershop where the average length of stay * Customers waiting in line for the average queue length. * Hours after the close of the service needs to be done finishing time.