Pakkaus

import java.util.Scanner;

public class Pakkaus {

    public static void main(String[] args) {
        String mj = "";
        String lj = "";
        boolean num = true;
        Scanner lukija = new Scanner(System.in);
        String input = lukija.nextLine();
        char merkki;

        for (int i = 0; i < input.length(); i++) {
            merkki = input.charAt(i);
            if (Character.isDigit(merkki)) {
                if (num == false) {
                    num = true;
                    for (int j = 1; j <= Integer.parseInt(lj); j++) {
                        System.out.print(mj);
                    }
                    lj = "";
                    mj = "";
                }
                lj += merkki;
            } else {
                if (num == true) {
                    num = false;
                }
                mj += merkki;
            }
        }
        for (int j = 1; j <= Integer.parseInt(lj); j++) {
            System.out.print(mj);
        }
        System.out.println("");
    }
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

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

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED