344. 反转字符串

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

难度简单439

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 char[] 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。

你可以假设数组中的所有字符都是 ASCII 码表中的可打印字符。

示例 1：

输入：["h","e","l","l","o"]
输出：["o","l","l","e","h"]

示例 2：

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

通过次数340,746提交次数445,926

class Solution {
    public void reverseString(char[] s) {
        char temp;
        for(int i=0,j=s.length-1;i<j;i++,j--)
        {
            temp = s[i];
            s[i] = s[j];
            s[j]= temp;
        }
    }
}