Problem(A22):Party

Judge Info
Memory Limit: 32768KB
Case Time Limit: 10000MS
Time Limit: 10000MS
Judger: Number Only Judger

Description
Frog Frank is going to have a party, he needs a large empty rectangular place. He ranted a large rectangular place in the forest, unfortunately the place is not empty, there are some trees in it. For solving the problem, he makes a map of the rectangular place with m × n grid, he paint the grid to black if there are some trees in it. Now, all he needs to do is find the largest rectangular place in the map contains no black grid.

Frank is asking your help to find out, the area(the number of grids) of the largest rectangular place without black grid.

Input
The first line of input contains , the number of test cases. For each test case, the first contains two integer number m and n , denotes the size of the map. In the next m lines, each line contains a string with n ’0’,’1’ characters, ’0’ denotes the empty grid, ’1’ denotes the black grid.

Output
For each test case, print the area(the number of grids) of the largest rectangular place in a line.

Sample Input
2
3 3
111
100
111
5 5
10101
00100
00000
00000
00001
Sample Output
2
12

```#include<stdio.h>
#include<string.h>
][];
][];
int main()
{
int T;
scanf("%d",&T);
int n,m;
while (T--)
{
scanf("%d%d",&n,&m);
memset(f,,sizeof(f));
int i,j,k;
;i<=n;i++) scanf("%s",s[i]);
;i<=n;i++)
;j<=m;j++)
]==;
;
;i<=n;i++)
;j<=m;j++)
) f[i][j]=f[i][j-]+;
int Max=0,l,r;
;i<=n;i++)
;j<=m;j++)
{
;k--)
][j]<f[i][j])
{
l=k;
break;
}
for (k=i;k<=n;k++)
][j]<f[i][j])
{
r=k;
break;
}
)>Max) Max=f[i][j]*(r-l+);
}
printf("%d\n",Max);
}
;
}```

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