aaaicu

문제 :https://www.acmicpc.net/problem/2675

 import java.util.Scanner;
 import java.util.StringTokenizer;

 public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int num = Integer.parseInt(scan.nextLine());
        String [] result = new String [num];

        for (int k = 0; k < num; k++) {
            result[k] = "";
            String input = scan.nextLine();
            StringTokenizer tokenInput = new StringTokenizer(input, " ");

            if (tokenInput.hasMoreTokens()) {
                int r = Integer.valueOf(tokenInput.nextToken());
                if (tokenInput.hasMoreTokens()) {
                    String s = tokenInput.nextToken();

                    for (int j = 0; j < s.length(); j++) {
                        for (int i = 0; i < r; i++) {
                            result[k] += Character.toString(s.charAt(j));
                        }
                    }
                }
            }
        }	
        for (String res : result) {
            System.out.println(res);
        }
        scan.close();
    }
 }