UVa 572 - Oil Deposits

#include<iostream>
#include<cstring>
#include<cstdlib>
#include<cstdio>
#include<cmath>
#include<string>
using namespace std;
char a[100+2][100+2];
int flag[100+2][100+2];
void DFS(int x,int y)
{
if(!(a[x][y]-'*')||flag[x][y])
return ;
flag[x][y]=1;
DFS(x-1,y);
DFS(x,y-1);
DFS(x+1,y);
DFS(x,y+1);
DFS(x-1,y-1);
DFS(x+1,y-1);
DFS(x+1,y+1);
DFS(x-1,y+1);
}
int main()
{
#ifdef test
freopen("sample.txt","r",stdin);
#endif
int count,m,n;
while(scanf("%d%d",&m,&n)!=EOF)
{
if(!n&&!m) break;
memset(a,'*',sizeof(a));
memset(flag,0,sizeof(flag));
for(int i=1; i<=m; i++)
{
getchar();
for(int j=1; j<=n; j++)
scanf("%c",&a[i][j]);
}
count=0;
for(int i=1; i<=m; i++)
for(int j=1; j<=n; j++)
{
if(!(a[i][j]-'@')&&!flag[i][j])
count++;
DFS(i,j);
}
printf("%d\n",count);
}
return 0;
}