[백준-2675번/Java] 문자열 반복

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int num = Integer.parseInt(sc.nextLine());

		for (int i = 0; i < num; i++) {
			int repeat = sc.nextInt();
			String str = sc.next();
			for (char c : str.toCharArray()) {
				for (int j = 0; j < repeat; j++) {
					System.out.print(c);
				}
			}
			System.out.println();
		}
	}

}