comefrom: <qiyuangong>121_Best_Time_to_Buy_and_Sell_Stock_1.py
code: def maxProfit( prices):
      length = len(prices)
      if length == 0:
          return 0
      max_profit, low = 0, prices[0]
      for i in range(1, length):
          if low > prices[i]:
              low = prices[i]
          else:
              temp = prices[i] - low
              if temp > max_profit:
                  max_profit = temp
      return max_profit
masked: def sample_funcname ( var_0 ) :
      var_2 = len ( var_0 )
      if var_2 == 0 :
          return 0
      var_4 , var_5 = 0 , var_0 [ 0 ]
      for var_8 in range ( 1 , var_2 ) :
          if var_5 > var_0 [ var_8 ] :
              var_5 = var_0 [ var_8 ]
          else :
              var_9 = var_0 [ var_8 ] - var_5
              if var_9 > var_4 :
                  var_4 = var_9
      return var_4
  