Jawaban HackerRank Genius 7 (12-12-2020)

package genius7.pkg12.pkg12.pkg2020;
import java.util.Scanner;
/**
 * @author Ronaldoztupang <your.name at your.org>
 */
public class Genius712122020 {

    static Scanner in = new Scanner(System.in);

    public static void main(String[] args) {
        int jmlAnak = in.nextInt(), jmlMatkul = in.nextInt();
        in.nextLine();
        String data[][] = new String[jmlAnak][(jmlMatkul + 1)];
        data = input(data);
        output(data);
        rataKelas(data);
        rankSatu(data);
    }

    static void output(String[][] data) {
        for (int i = 0; i < data.length; i++) {
            double rata = 0;
            for (int j = 1; j < data[i].length; j++) {
                rata += Double.valueOf(data[i][j]);
            }
            rata /= data[i].length - 1;
            System.out.println("Rata-rata nilai mahasiswa " + data[i][0] + " adalah " + rata);
        }
    }

    static void rataKelas(String[][] data) {
        double rataKelas = 0;
        for (int i = 0; i < data.length; i++) {
            double rata = 0;
            for (int j = 1; j < data[i].length; j++) {
                rata += Double.valueOf(data[i][j]);
            }
            rata /= data[i].length - 1;
            rataKelas += rata;
        }
        rataKelas /= data.length;
        System.out.println("Rata-rata kelas: " + rataKelas);
    }

    static void rankSatu(String[][] data) {
        double rank1 = 0;
        int index = 0;
        for (int i = 0; i < data.length; i++) {
            double rata = 0;
            for (int j = 1; j < data[i].length; j++) {
                rata += Double.valueOf(data[i][j]);
            }
            rata /= data[i].length - 1;
            if (rank1 < rata) {
                rank1 = rata;
                index = i;
            }
        }
        System.out.println("Mahasiswa yang memiliki nilai tertinggi adalah " + data[index][0] + " dengan nilai " + rank1);
    }

    static String[][] input(String[][] data) {
        for (int i = 0; i < data.length; i++) {
            data[i][0] = in.next();
            for (int j = 1; j < data[i].length; j++) {
                data[i][j] = in.next();
            }
        }
        //data akan berisi string yang terdiri atas gabungan anatara string maupun double
        return data;
    }
}