Flood Fill

#include <iostream>
#include <set>
#include <map>
#include <vector>
#include <algorithm>
#include <utility>
#include <functional>
#include <stack>
#include <queue>
#include <deque>
#include <string>
#include <cstring>
#include <cstdio>
#include <cctype>
#include <cstdlib>
#include <cmath>
#include <fstream>
using namespace std;
#define siz 105

char ar[siz][siz];

void floodfill(int a, int b, int m, int n){
    int x,y;
    ar[a][b]='?';

    for(int x=-1;x<2;x++)
        for(int y=-1;y<2;y++){
            int newx=x+a, newy=y+b;
            if(newx>=0&&newx<m&&newy>=0&&newy<n){
                if(ar[newx][newy]=='@'){
                    floodfill(newx,newy,m,n);
                }
            }
        }
}
int main()
{
    int m,n;
    while(scanf("%d%d",&m,&n)==2){
        if(m==0&&n==0) break;

        for(int i=0;i<m;i++)
            cin>>ar[i];

        int cnt=0;
        for(int i=0;i<m;i++){
            for(int j=0;j<n;j++){
                int s=0;
                if(ar[i][j]=='@'){
                    cnt++;
                    floodfill(i,j,m,n);
                }
            }
        }
        printf("%d\n",cnt);
    }
    return 0;
}