asteroids.java

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

// Sample input 3, in Java.
public class asteroids {
    public asteroids() {
    }

    static int n = -1, m = -1;

    static void load() {
        if (n != -1) {
            return;
        }
        Scanner sc;
        try {
            sc = new Scanner(new File("input.txt"));

            n = sc.nextInt();
            m = sc.nextInt();
            s = new String[n];
            for (int i = 0; i < n; i++) {
                s[i] = sc.next();
            }
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    static String[] s;

    public static long GetHeight() {
        load();
        return n;
    }

    public static long GetWidth() {
        load();
        return m;
    }

    public static char GetPosition(long i, long j) {
        load();
        if (i < 0 || i >= n || j < 0 || j >= m)
            throw new IllegalArgumentException("Invalid argument");
        return s[(int) i].charAt((int) j);
    }
}