class Solution {
public:
string reverseString(string s) {
string ans(s.length(),'\0');
int len = s.length();
int i = 0;
while(len)
ans [i++] = s[--len];
return ans;
}
};
class Solution {
public:
string reverseString(string s) {
string ans(s.length(),'\0');
int len = s.length();
int i = 0;
while(len)
ans [i++] = s[--len];
return ans;
}
};