# [344. Reverse String](https://leetcode.com/problems/reverse-string/)

## 题目

Write a function that reverses a string. The input string is given as an array of characters char[].

Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory.

You may assume all the characters consist of printable ascii characters.

**Example 1**:

```

Input: ["h","e","l","l","o"]
Output: ["o","l","l","e","h"]

```

**Example 2**:

```

Input: ["H","a","n","n","a","h"]
Output: ["h","a","n","n","a","H"]

```

## 题目大意

题目要求我们反转一个字符串。

## 解题思路

这一题的解题思路是用 2 个指针，指针对撞的思路，来不断交换首尾元素，即可。



## 代码

```go

package leetcode

func reverseString(s []byte) {
	for i, j := 0, len(s)-1; i < j; {
		s[i], s[j] = s[j], s[i]
		i++
		j--
	}
}

```