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# 344. 反转字符串

<https://leetcode-cn.com/problems/reverse-string/>

## 解法一：

用直接逆序`s[::-1]`的方法发现行不通，还是老实交换吧：

```python
class Solution:
    def reverseString(self, s: List[str]) -> None:
        """
        Do not return anything, modify s in-place instead.
        """        
        i, j = 0, len(s)-1
        while i < j:
            s[i], s[j] = s[j], s[i]
            i += 1
            j -= 1
```