Pakkaus

import java.util.Scanner;
 
public class Pakkaus {
    public static void main(String[] args) { 
        
        Scanner lukija = new Scanner(System.in);
        
        String syote = lukija.nextLine();
        
        //Jaetaan syote  paloiksi
        String pakatut = "";
        StringBuilder luku = new StringBuilder();
        StringBuilder kirjaimet = new StringBuilder();
        boolean kirjainHuomattu = false;
        
        for (int i = 0; i < syote.length(); i++) {
            //on numero
            if (Character.getNumericValue(syote.charAt(i)) < 10) {   
                if (kirjainHuomattu) {
                    int formaara = Integer.parseInt(luku.toString());
                    for (int a = 0; a < formaara; a++) {
                        pakatut += kirjaimet;
                    }                 
                    luku.delete(0, luku.length());
                    kirjaimet.delete(0, kirjaimet.length());
                    kirjainHuomattu = false;
                }
                luku.append(syote.charAt(i));
            } else {   
                kirjainHuomattu = true;
                kirjaimet.append(syote.charAt(i));
            }
        }
        for (int a = 0; a < Integer.parseInt(luku.toString()); a++) {
            pakatut += kirjaimet.toString();
        } 
             
        System.out.println(pakatut);
    }    
 }

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: ACCEPTED

Test 12

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 13

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 14

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 15

Group: 3

Verdict: TIME LIMIT EXCEEDED