leetcode-344. 反转字符串

class Solution {
    public void reverseString(char[] s) {
        // 获取数组的长度
        int n = s.length;
        // 利用双指针，左右指针往中间靠，过程两两相互交换，直到 left = right
        for (int left = 0, right = n - 1; left < right; ++left, --right) {
            char tmp = s[left];
            s[left] = s[right];
            s[right] = tmp;
        }
    }
}