Miser gifts his date

Amit is going on a date and he wants to gift his date an array of positive numbers. But he is running short on money. He already has an array of numbers in design. **Cost of an array of numbers is the sum of elements in it**. But he wants to minimize the cost of making it. So he does the following number of operations one by one for any number of times: He chooses **two adjacent elements** ,r