Pakkaus

import java.util.Scanner;
 
/**
 *
 * @author Miro Petsalo
 */
public class Compresio12n {
 
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) { 
       Scanner s = new Scanner(System.in);
     String c = s.nextLine();
     int nb2 =c.length();
     String answer ="";
     StringBuilder answer1 = new StringBuilder("");
 
 
  while (nb2>0) { 
      
 
      
      int i=0;
      
       String d[] = c.split("(?<=\\D)(?=\\d)|(?<=\\d)(?=\\D)");
        nb2=nb2-d[i].length();
        int x = Integer.parseInt(d[0]);
        c=c.replaceFirst(d[i], "");
        
        while(x>0){
          answer1.append(d[i+1]);
            x=x-1;
                                            }
 
     
              
               c=c.replaceFirst(d[i+1], "");
 
        
       nb2 = nb2-d[1].length();
    
                                                    }
      System.out.println(answer1);   
    }
    
}

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: TIME LIMIT EXCEEDED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED