题解 | 单组_字符串

import java.util.Scanner;
import java.io.*;
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(br.readLine());
        String s = br.readLine();
        String reverse = new StringBuilder(s).reverse().toString();
        System.out.print(reverse);
    }
}