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();
		int i = 0, amount = 0;
		String str;
		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);
		}
		io.print("\n");
		reader.close();
		io.close();
	}
 
	private static void printString(int amount, String str, IO io) {
		for (int 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: 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