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acm algorithm design Description: n has a customer waiting for a service at the same time. I need to service customers time ti, 1 < = i < = n. N how to arrange the order of a customer' s service to make the average waiting time to a minimum? Average waiting time is n-time customers wait for service by dividing the sum of n. N for a given month of the service needs of customers, the best services to the order of the calculation program. Input: the first line is a positive integer n, that there are n customer. 1 the next line, there is a positive integer n, that n of the service needs of customers. Output: the minimum average waiting time for cases of type: 10 56 12 1 99 1000 234 33 55 99 812 cases Output: 532.00