小红的字符串

实现代码：

 public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        int n = s.length();
        int ans = 0;
        
        for (int i = 0; i < n / 2; i++) {
            char left = s.charAt(i);
            char right = s.charAt(n - 1 - i);
            int diff = Math.abs(left - right);
            ans += Math.min(diff, 26 - diff);
        }
        
        System.out.println(ans);
        sc.close();
    }