Daily Coding Problem: Problem #1552 [Easy]

Good morning! Here's your coding interview problem for today.

This problem was asked by Facebook.

Given a array of numbers representing the stock prices of a company in chronological order, write a function that calculates the maximum profit you could have made from buying and selling that stock once. You must buy before you can sell it.

For example, given [9, 11, 8, 5, 7, 10], you should return 5, since you could buy the stock at 5 dollars and sell it at 10 dollars.

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