comefrom: <qiyuangong>084_Largest_Rectangle_in_Histogram_1.py
code: def largestRectangleArea( heights):
      largest_rectangle = 0
      ls = len(heights)
      stack = [-1]
      top, pos = 0, 0
      for pos in range(ls):
          while top > 0 and heights[stack[top]] > heights[pos]:
              largest_rectangle = max(largest_rectangle, heights[stack[top]] * (pos - stack[top - 1] - 1))
              top -= 1
              stack.pop()
          stack.append(pos)
          top += 1
      while top > 0:
          largest_rectangle = max(largest_rectangle, heights[stack[top]] * (ls - stack[top - 1] - 1))
          top -= 1
      return largest_rectangle
masked: def sample_funcname ( var_0 ) :
      var_2 = 0
      var_4 = len ( var_0 )
      var_6 = [ - 1 ]
      var_7 , var_8 = 0 , 0
      for var_8 in range ( var_4 ) :
          while var_7 > 0 and var_0 [ var_6 [ var_7 ] ] > var_0 [ var_8 ] :
              var_2 = max ( var_2 , var_0 [ var_6 [ var_7 ] ] * ( var_8 - var_6 [ var_7 - 1 ] - 1 ) )
              var_7 -= 1
              var_6.pop ( )
          var_6.append ( var_8 )
          var_7 += 1
      while var_7 > 0 :
          var_2 = max ( var_2 , var_0 [ var_6 [ var_7 ] ] * ( var_4 - var_6 [ var_7 - 1 ] - 1 ) )
          var_7 -= 1
      return var_2
  