Freaks City

Given a (n \times m) matrix where each cell contains either 0 (white) or 1 (black), a subrectangle is considered balanced if the number of black cells equals the number of white cells inside it. The task is to find the area (total number of cells) of the largest balanced subrectangle, or 0 if none exists. Both (n) and (m) are at most 10, which ...