| #include <bits/stdc++.h> |
|
|
| using namespace std; |
|
|
| int n, m, ans, area, v[105][105]; |
|
|
| int main(){ |
| while(scanf("%d %d", &n, &m), n | m){ |
| for(int i = 1; i <= n; i++) |
| for(int j = 1; j <= m; j++) |
| scanf("%d", &v[i][j]), v[i][j] += v[i - 1][j] + v[i][j - 1] - v[i - 1][j - 1]; |
| ans = 0; |
| for(int i = 1; i <= n; i++) |
| for(int j = 1; j <= m; j++) |
| for(int ii = i; ii <= n; ii++) |
| for(int jj = j; jj <= m; jj++){ |
| if((ii - i + 1) * (jj - j + 1) > ans){ |
| area = v[ii][jj] - v[ii][j - 1] - v[i - 1][jj] + v[i - 1][j - 1]; |
| if(area == 0) ans = (ii - i + 1) * (jj - j + 1); |
| } |
| } |
| printf("%d\n", ans); |
| } |
| return(0); |
| } |
|
|
