class Solution(object):
def maximalRectangle(self, matrix):
"""
:type matrix: List[List[str]]
:rtype: int
"""
if not matrix or not matrix[0]:
return 0
n = len(matrix[0])
height = [0] * (n + 1)
ans = 0
for row in matrix:
for i in xrange(n):
height[i] = height[i] + 1 if row[i] == '1' else 0
stack = [-1]
for i in xrange(n + 1):
while height[i] < height[stack[-1]]:
h = height[stack.pop()]
w = i - 1 - stack[-1]
ans = max(ans, h * w)
stack.append(i)
return ans
https://leetcode.com/problems/maximal-rectangle/#/solutions
