Max loss of the stock

Given an array of stock prices from day 0 to N-1 of a company X, we have to find the max loss that is possible. Loss occurs if stock is bought at higher price and sold at lower price.
Ex: 1 2 3 7 5 8 9 4 6 10 12
Max Loss is 9 - 4 = 5 (Possible losses are 8-4 = 4, 7-5 = 2 etc). Max difference between stock price is 12 - 1 = 11 but max loss is 9 -4 = 5

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