题解 | 单组_字符串

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        scanner.nextLine(); // 消耗换行符
        String s = scanner.nextLine();

        char[] chars = s.toCharArray();
        int left = 0, right = n - 1;
        while (left < right) {
            char temp = chars[left];
            chars[left] = chars[right];
            chars[right] = temp;
            left++;
            right--;
        }
        System.out.println(new String(chars));
    }
}