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0344-反转字符串
https://leetcode.cn/problems/reverse-string
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
思路
前后坐标替换
参考代码
csharp
public class Solution {
public void ReverseString(char[] s) {
int n = s.Length;
int i = 0;
while(i < n/2){
char temp = s[i];
s[i] = s[n-i-1];
s[n-i-1] = temp;
i++;
}
}
}