[백준] 2675번 : 문자열 반복 -JAVA

import java.util.Scanner;

public class Main{
  public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int T = scan.nextInt();
		for (int i = 0; i < T; i++) {
			int R = scan.nextInt();
			String S = scan.next();
			for (int k = 0; k < S.length(); k++) {
				for (int j = 0; j < R; j++) {
					System.out.print(S.charAt(k));
				}
			}
			System.out.println();
		}
	}
}