Lehmät

import java.util.Scanner;

public class Lehmat {
    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);

        int heigth = scan.nextInt();
        int width = scan.nextInt();

        scan.nextLine();

        String[][] map = new String[heigth][width];
        String mapLine = new String();

        for(int i = 0; i < heigth; i++) {
            mapLine = scan.nextLine();

            for(int j = 0; j < width; j++) {
                map[i][j] = mapLine.substring(j,j+1);
            }
        }

        /*for(int i = 0; i < heigth; i++) {
            for(int j = 0; j < width; j++) {
                System.out.print(map[i][j]);
            }
            System.out.print("\n");
        }*/

        int minWidth = width, maxWidth = 0;
        int minHeigth = heigth, maxHeigth = 0;

        for(int i = 0; i < heigth; i++) {
            for(int j = 0; j < width; j++) {
                if(map[i][j].equals("*")) {
                    minWidth = Math.min(minWidth,j);
                    minHeigth = Math.min(minHeigth,i);
                    maxWidth = Math.max(maxWidth,j);
                    maxHeigth = Math.max(maxHeigth,i);
                }
            }
        }
        /*System.out.println(minWidth + " " + maxWidth);
        System.out.println(minHeigth + " " + maxHeigth);
        System.out.print("\n");*/

        int cows = 0;

        for(int i = minHeigth; i <= maxHeigth; i++) {
            for(int j = minWidth; j <= maxWidth; j++) {
                //System.out.print(map[i][j]);
                if(map[i][j].equals("@")) {
                    cows++;
                }
            }
            //System.out.print("\n");
        }

        System.out.println(cows);
    }
}

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 1, 2

Verdict: ACCEPTED

Test 3

Group: 1, 2

Verdict: ACCEPTED

Test 4

Group: 1, 2

Verdict: ACCEPTED

Test 5

Group: 1, 2

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED