gistfile1.txt

func maxProfit(prices: [Int]) -> Int {
  if prices.count < 2 {
    return 0
  }

  var profit = 0
  var min = prices[0]

  for price in prices {
    if price - min > profit {
      profit = price - min
    }

    if price < min {
      min = price
    }
  }

  return profit
}