백준 2675번 문자열 반복 - JAVA(문자추출: charAt)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
public class Main {
	public static void main(String[] args) throws IOException {	
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int t = Integer.parseInt(br.readLine());
		StringTokenizer st;
		int[] rArr = new int [t];
		String[] pArr = new String [t];
		for(int i = 0; i < t; i++) {
			st = new StringTokenizer(br.readLine());
			rArr[i] = Integer.parseInt(st.nextToken());
			pArr[i] = st.nextToken();
		}
		for(int i = 0; i < t; i++) {
			for(int j = 0; j < pArr[i].length(); j++) {
				for(int k = 0; k <rArr[i]; k++) {
					System.out.print(pArr[i].charAt(j));
				}
			}
			System.out.println();
		}
	}
}