题解 | 单组_字符串

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        
        int len = in.nextInt();
        String s = in.next();
        StringBuilder reversed = new StringBuilder();
        for(int i = len -1; i >= 0; i--){
            reversed.append(s.charAt(i));
        }

        System.out.println(reversed.toString());
        in.close();
    }
}