max_area

class Solution:
    # @param A : list of integers
    # @return an integer
    def largestRectangleArea(self, A):
        max_sum = 0
        if len(A) == 0:
            return None
        if len(A) == 1:
            return A[0]
        for i in range(len(A)):
            count = 1
            round_sum = 0
            while i+count  <= len(A)-1:
                sum = min(A[i:i+count+1]) *  (count+1)
                count += 1
                if sum > round_sum:
                    round_sum = sum
                if sum < round_sum:
                    break
                if round_sum > max_sum:
                    max_sum = round_sum
        return max_sum



s = Solution()
#list = [ 90, 58, 69, 70, 82, 100, 13, 57, 47, 18 ]
list =  [ 65, 19, 8, 39, 14, 21, 83, 87, 95, 11, 14, 58, 11, 90,
          34, 96, 34, 62, 96, 38, 58, 57, 12, 78, 57, 60, 7, 58,
          56, 49, 36, 67, 69, 30, 74, 46, 97, 62, 47, 42, 43, 98,
          60, 32, 39, 75, 69, 28, 35, 52, 89, 78, 4, 26, 65, 21,
          39, 89, 87, 69, 48, 60, 6, 21, 5, 98, 52, 59 ]

#list = [51,33]
#list = [ 6, 2, 5, 4, 5, 1, 6 ]
#10
print(s.largestRectangleArea(list))

Your function returned the following :
570
The expected returned value :
700