Reverse String

c++

class Solution {public:    string reverseString(string s) {        if (s.empty() || s.size() < 2)            return s;        int i = 0;        int j = s.size() - 1;        while (i < j) {            auto tmp = s[i];            s[i] = s[j];            s[j] = tmp;            ++i;            --j;        }        return s;     }};

python

class Solution(object):    def reverseString(self, s):        """        :type s: str        :rtype: str        """        s = list(s)        i, j = 0, len(s)-1        while i<j:            s[i], s[j] = s[j], s[i]            i += 1            j -= 1        return ''.join(s)