344. 反转字符串(简单)

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"]

来源:力扣(LeetCode)
链接:https://leetcode-cn.com/problems/reverse-string

思路:

比较简单,双指针

代码:

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class Solution {
public void reverseString(char[] s) {
int left = 0;
int right = s.length-1;
while (left<right){
//交换
char temp = s[left];
s[left] = s[right];
s[right] = temp;
//左右移动
left++;
right--;
}
}
}