text: class Solution(object):
      def maxProfit(self, prices):
          """
          :type prices: List[int]
          :rtype: int
          """
          sellPrice = 9999999
          length = len(prices)
          maxAns = 0
          for x in range(0, length):
              if prices[x] < sellPrice:
                  sellPrice = prices[x]
              if prices[x] > sellPrice:
                  temp = prices[x] - sellPrice
                  if temp > maxAns:
                      maxAns = temp
          return maxAns
  