HDU 1241 Oil Deposits

#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
int n,m,t,p;
char map[105][105];
int yi[8][2]={{1,0},{-1,0},{0,1},{0,-1},{1,1},{1,-1},{-1,1},{-1,-1}};
void dfs(int x,int y)
{
    int i,j,rx,ry;
    map[x][y]=‘*‘;
    for (i=0;i<8;i++)
    {
         rx=x+yi[i][0];
         ry=y+yi[i][1];
        if (rx>=1 && rx<=n && ry>=1 && ry<=m && map[rx][ry]==‘@‘)
        {
            map[rx][ry]=‘*‘;
            dfs(rx,ry);
        }
    }
    return ;
}
int main()
{
    int i,j,ans;
    while (~scanf("%d%d",&n,&m))
    {
        if (n==0&&m==0) break;
        ans=0;
        getchar();
        for (i=1;i<=n;i++)
        for (j=1;j<=m;j++) scanf(" %c",&map[i][j]);
        for (i=1;i<=n;i++)
        for (j=1;j<=m;j++)
        if (map[i][j]==‘@‘)
        {
            dfs(i,j);
            ans++;
        }
        printf("%d\n",ans);
    }
    return 0;
}