Score : $200$ points

问题描述

你将获得三个整数 $L$，$R$ 以及一个由小写英文字母组成的字符串 $S$。
请打印该字符串，但其中第 $L$ 个至第 $R$ 个字符的顺序反转后的内容。

以上为通义千问 qwen-max 翻译，仅供参考。

Problem Statement

You are given integers $L$, $R$, and a string $S$ consisting of lowercase English letters.
Print this string after reversing (the order of) the $L$-th through $R$-th characters.

Constraints

• $S$ consists of lowercase English letters.
• $1 \le |S| \le 10^5$ ($|S|$ is the length of $S$.)
• $L$ and $R$ are integers.
• $1 \le L \le R \le |S|$

Input

Input is given from Standard Input in the following format:

$L$ $R$

$S$

Output

Print the specified string.

Sample Input 1

3 7
abcdefgh

Sample Output 1

abgfedch

After reversing the $3$-rd through $7$-th characters of abcdefgh, we have abgfedch.

Sample Input 2

1 7
reviver

Sample Output 2

reviver

The operation may result in the same string as the original.

Sample Input 3

4 13
merrychristmas

Sample Output 3

meramtsirhcyrs

update @ 2024/3/10 10:08:29