题解 | #字符串反转#

import java.util.Scanner;

// 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) {
        Scanner in = new Scanner(System.in);

        String str =  in.nextLine();
        char[] arr = str.toCharArray();
        String s = "";
        for (int i = arr.length - 1; i >= 0; i--) {
            s += arr[i];
        }
        System.out.println(s);
    }

}