344. Reverse String

1 class Solution {
2 public:
3     string reverseString(string s) {
4         int size = s.length();
5         for(int i = 0, j = size - 1; i < j; i++, j--)
6             swap(s[i], s[j]);
7         return s;
8     }
9 };

 1 char* reverseString(char* s) {
 2     int i = 0, j = strlen(s) - 1, tmp;
 3     for(; i < j; i++, j--){
 4         tmp = s[i];
 5         s[i] = s[j];
 6         s[j] = tmp;
 7     }
 8     return s;
 9     
10 }