String | 344. Reverse String

题目：反转字符串

方法1：

class Solution {
public:
    string reverseString(string s) 
    {
        int m = (s.size() -1) / 2;
        for(int i = 0; i <= m; ++i)
        {
            char c = s[i];
            s[i] = s[s.size() -1 - i];
            s[s.size() -1 - i] = c;
        }
        return s;        
    }
};

方法2：

class Solution {
public:
    string reverseString(string s) 
    {
        reverse(s.begin(), s.end());
        return s;
    }
};