Poj Solution 1562

http://poj.org/problem?id=1562

//* @author: 82638882@163.com
import java.util.Scanner;
public class Main
{
  public static void main(String[] args)
   {
    Scanner in=new Scanner(System.in);
    while(true)
    {
    int a=in.nextInt();
    int b=in.nextInt();
    if(a==0&&b==0)break;
    int count=0;
    int[][] arr=new int[a+2][b+2];
    for(int i=1;i<=a;i++){
        String s=in.next();
        for(int j=1;j<=b;j++)
              arr[i][j]=s.charAt(j-1);
    }
    for(int i=1;i<=a;i++)
      for(int j=1;j<=b;j++)
        if(arr[i][j]==64){
            find(arr,i,j);
            count++;
        }
    System.out.println(count);
        }
                
     }
    
 public static void find(int[][] a,int i,int j)
  {
    a[i][j]=65;
    for(int k=i-1;k<=i+1;k++)
          for(int w=j-1;w<=j+1;w++)
        if(a[k][w]==64)find(a,k,w);
 }
}