Pakkaus

import java.util.Scanner;
 
public class Pakkaus {
 
	public static void main(String[] args) {
		//IO io = new IO();
		Scanner reader = new Scanner(System.in);
		String input = reader.next();
		//String input = io.next();
		int i;// = 0, amount = 0;
		//String str;
		String[] strlist = input.split("(?<=\\D)(?=\\d)|(?<=\\d)(?=\\D)");
		for (i=1;i<strlist.length;i+=2) {
			for (int j=0;j<Integer.valueOf(strlist[i-1]);j++) {
				System.out.print(strlist[i]);
			}
		}
//		while (i<input.length()-1) {
//			amount = 0;
//			str = "";
//			while (Character.isDigit(input.charAt(i)))
//				amount = amount * 10 + Character.getNumericValue(input.charAt(i++));
//			while (!Character.isDigit(input.charAt(i))) {
//				str += String.valueOf(input.charAt(i++));
//				if (i>input.length()-1)
//					break;
//			}
//			printString(amount, str, io);
//		}
		System.out.print("\n");
		reader.close();
		//io.close();
	}
 
//	private static void printString(int amount, String str, IO io) {
//		for (long i=0;i<amount;i++) {
//			io.print(str);
//		}
//	}
 
}

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: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED