poj 1562 Oil Deposits(dfs)

import java.util.Scanner;

public class Main {

    static String field[][];
    
    static int rows;
    static int columns;
    
    static int pockets;
    
    static boolean marked[][];
    
    static int dx[] = {-1, 0, 1, -1, 1, -1, 0, 1};
    static int dy[] = {1, 1, 1, 0, 0, -1, -1, -1};
    
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while((rows =sc.nextInt()) != 0 && (columns = sc.nextInt()) != 0) {
            pockets = 0;
            field = new String[rows][columns];
            marked = new boolean[rows][columns];
            for(int i = 0; i < rows; i++) {
                String line = sc.next();
                for(int j = 0; j < columns; j++) {
                    field[i][j] = line.substring(j, j + 1);
                }
            }
            
            for(int i = 0; i < rows; i++)
                for(int j = 0; j < columns; j++) {
                    if(!marked[i][j] && field[i][j].equals("@")) {
                        dfs(i, j);
                        pockets++;
                    }
                }
            System.out.println(pockets);
        }
    }
    
    public static void dfs(int row, int col) {
        
        for(int i = 0; i < 8; i++) {
            int _row = row + dy[i];
            int _col = col + dx[i];
            if(_row < rows && _row >= 0 && _col < columns && _col >= 0 && !marked[_row][_col] && field[_row][_col].equals("@")) {
                marked[_row][_col] = true;
                dfs(_row, _col);
            }
        }
    }

}