杭电 1241 Oil Deposits

题目地址：

　　　　http://acm.hdu.edu.cn/showproblem.php?pid=1241

　　　　经典深度优先遍历!

#include <stdio.h>
#define MAXN 110
#define MAXM 110
int n, m;
char field[MAXN][MAXM];

void dfs(int i, int j)
{
    int dx, dy;
    int nx, ny;
    field[i][j] = '*';

    for( dx = -1; dx <= 1; dx++ )
        for( dy = -1; dy <= 1; dy++ )
        {
            nx = i + dx;
            ny = j + dy;

            if( nx>=0 && nx<m && ny>=0 && ny<n && field[nx][ny]=='@' )
                dfs(nx,ny);
        }


}
void solve()
{
    int i, j, res = 0;
    for( i = 0; i < m; i++ )
        for( j = 0; j < n; j++ )
            if( field[i][j] == '@' )
            {
                dfs(i,j);
                res++;
            }
    printf("%d
", res);
}

int main()
{
    int i, j;
    while( (scanf( "%d%d", &m, &n ) != EOF) && m )
    {
        //printf( "%d %d
", m ,n );
        getchar();
        for( i = 0; i < m; i++ )
        {
            for( j = 0; j < n; j++ )
                scanf("%c",&field[i][j]);
            getchar();
        }
        /*for( i = 0; i < m; i++ )
        {
            for( j = 0; j < n; j++ )
                printf( "%c", field[i][j] );
            printf("
");
        }*/
        solve();
    }
    return 0;
}