/*反转字符串
编写一个函数，其作用是将输入的字符串反转过来。输入字符串以字符数组 s 的形式给出。

不要给另外的数组分配额外的空间，你必须原地修改输入数组、使用 O(1) 的额外空间解决这一问题。

 

示例 1：

输入：s = ["h","e","l","l","o"]
输出：["o","l","l","e","h"]
示例 2：

输入：s = ["H","a","n","n","a","h"]
输出：["h","a","n","n","a","H"]
 

提示：

1 <= s.length <= 105
s[i] 都是 ASCII 码表中的可打印字符*/

class Solution {
public:
    void reverseString(vector<char>& s) 
    {
        int left = 0;
        int right = s.size()-1;

        while(left < right)
        {
            swap(s[left], s[right]);

            ++left;
            --right;
        }
        
    }
};