题解 | 单组_字符串

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);
        // 注意 hasNext 和 hasNextLine 的区别
        int n = in.nextInt();
        in.nextLine();
        String s = in.nextLine();
        char[] c = s.toCharArray();
        int left = 0;
        int right = n - 1;
        while (left < right) {
            char tem = c[left];
            c[left++] = c[right];
            c[right--] = tem;

        }
        System.out.println(new String(c));
    }
}