UVa 527 oil deposits

#include<cstdio>
#include<cstring>
#define MAXN 110
char plot[MAXN][MAXN],vis[MAXN][MAXN];
int m,n;
void dfs(int x, int y)
{
	if(vis[x][y] || plot[x][y] == '*' ||x<0 || x>=m || y<0 || y>=n)return;

	vis[x][y]=1;
	dfs(x-1, y-1);	dfs(x-1, y);	dfs(x-1, y+1);
	dfs(x, y-1);					dfs(x, y+1);
	dfs(x+1,y-1);	dfs(x+1,y);		dfs(x+1,y+1);
}
int main()
{
	while(scanf("%d%d", &m, &n) != EOF && m)
	{
		for(int i=0;i<m;i++)
			scanf("%s",plot[i]);
		memset(vis, 0, sizeof(vis));
		memset(re, 0, sizeof(re));
		int count=0;
		for(int i=0; i<m; i++)
			for(int j=0; j<n; j++)
				if(plot[i][j] == '@' && !vis[i][j])
				{
					count++;
					dfs(i,j);
				}
		printf("%d\n",count);
	}
}