UVA Problem ID 572 (Oil Deposits)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;


public class Main {
	public static void main (String args[]) throws IOException
	{
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String input;
		StringBuilder sb=new StringBuilder(1000);
		while((input=br.readLine())!=null)
		{
			String s[]=input.split(" +");
			int m=Integer.parseInt(s[0]);
			int n=Integer.parseInt(s[1]);
			if(m==0)
				break;
			char grid[][]=new char[m][n];
			
			for (int i = 0; i < m; i++) {
				input=br.readLine();
				for (int j = 0; j < n; j++) {
					grid[i][j]=input.charAt(j);
				}	
			}
			int no_of_oilDeposits=0;
			for(int i=0;i=0)
		{
			if(column-1>=0 && grid[row-1][column-1]=='@')
				floodfill(grid,row-1, column-1,rowlimit,columnlimit);
			if(column+1=0 && grid[row+1][column-1]=='@')
				floodfill(grid,row+1, column-1,rowlimit,columnlimit);
			if(column+1=0 && grid[row][column-1]=='@')
			floodfill(grid,row, column-1,rowlimit,columnlimit);
		if(column+1