[Java] 백준 2675번 : 문자열 반복 / 코드 O

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < n; i ++) {
            int m = sc.nextInt();
            char[] chars = sc.next().toCharArray();
            for (char c : chars) {
                sb.append(String.valueOf(c).repeat(m));
            }
            sb.append("\n");
        }
        System.out.print(sb);
    }
}