def maxProfit(self, prices: List[int]) -> int:

        min_price_so_far = float("inf")
        max_profit = 0

        for i in range(len(prices)):
            max_profit_so_far = prices[i] - min_price_so_far
            max_profit = max(max_profit, max_profit_so_far)
            min_price_so_far = min(prices[i], min_price_so_far)

        return max_profit