栈的思想方法

 1 def largestRectangleArea(self, height):     
 2 height.append(0)    
 3 size = len(height)   
 4 no_decrease_stack = [0]   
 5 max_size = height[0]  
 6 i = 0 while i < size:      
 7 cur_num = height[i]     
 8 if (not no_decrease_stack or  cur_num>height[no_decrease_stack[-1]]):             
   no_decrease_stack.append(i)         
 9 i += 1        
10 else:           
11 index = no_decrease_stack.pop()      
12 if no_decrease_stack:      
13 width = i - no_decrease_stack[-1] - 1         
14 else:             
15 width = i        
16 max_size = max(max_size, width * height[index])    
17 return max_size