银行业务情况模拟（银行有四个柜台。客户随机地进入银行办理业务，每个人办理业务需要的时间也是随机确定。客户进入银行后选择队列最短的队列排队，如果队列都一样长，则随机选择一个队列排队。客户进入队列后，如果是队列第一个，则接受银行服务，直到服务完成，然后离开银行。-banking business of simulation (4 bank counters. Random access to customer bank business, Everyone transacting business and the time required is determined randomly. After entering the bank customers to choose the shortest queue queue queue, If the queue are the same length, then randomly selected a queue queue. customers enter the queue, and if the first cohort, it is acceptable for banking services until the completion of services, and then left the bank.