算法天天练334：字符串翻转
题目来源： https://leetcode.com/problems/reverse-string/
问题描述： 颠倒一个char数组里面的字符串顺序，只能修改原始数组的值，不允许分配额外的空间。
举例说明：
| 输入 | 输出 |
|---|---|
| ["h","e","l","l","o"] | ["o","l","l","e","h"] |
| ["H","a","n","n","a","h"] | ["h","a","n","n","a","H"] |
解决方案
- 遍历数组后用中间变量交换元素位置，时间复杂度Ο(n)
class Solution {
public void reverseString(char[] s) {
int length = s.length;
for(int i=0;i