【字符串】 344. 反转字符串

题目：

 

 

解答:

class Solution {
public:
    void reverseString(vector<char>& s) 
    {
        if (s.size() <= 1)
        {
            return;
        }

        int beg = 0;
        int end = s.size() - 1;

        while (beg < end)
        {
            char tmp = s[beg];
            s[beg] = s[end];
            s[end] = tmp;
            beg++;
            end--;
        }
    }
};