leetcode刷题（116）——反转字符串

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

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

class Solution {
    public void reverseString(char[] s) {
        int n = s.length;
        for (int left = 0, right = n - 1; left < right; ++left, --right) {
            char tmp = s[left];
            s[left] = s[right];
            s[right] = tmp;
        }
    }
}