Hi guys, I need help with a problem that I've been trying to solve for a while now.

Statement: Given a M x N binary matrix with at most 100000 ones, and given two integers a and b, count the number of zero submatrices with size a x b. Constraints: 1 <= a, b <= M, N <= 10000.

Some more info: The memory and time constraints are 64mb, and 1 sec. Sadly, the problem statement isn't in English, but here's a link to it anyway if you guys want to check it out: http://mendo.mk/Task.do?id=616