class Solution {
public:
void reverseString(vector<char>& s)
{
reverse(s.begin(), s.end());
}
};
class Solution {
public:
void reverseString(vector<char>& s)
{
int len = s.size();
int i = 0;
int j = len - 1;
while(i <= j)
{
int tmp = s[i];
s[i] = s[j];
s[j] = tmp;
i++;
j--;
}
}
};
