Problem
Given a binary matrix (0s and 1s), find the area of the largest rectangle consisting only of 1s.
Input format
Input
input.txt
- Two integers N, M (1 ≤ N, M ≤ 20) - N rows with M integers (0 or 1)
Output format
Output
output.txt
- The area of the largest rectangle.
Example
input
3 4 1 0 1 1 1 1 1 1 0 1 1 1
output
6
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Sample cases (from the problem)
Sample Case 1
Input
3 4 1 0 1 1 1 1 1 1 0 1 1 1
Expected output
6
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