#include <iostream>
#include <cstring>
using namespace std;
int main() {
char s[] = "hello";
_strrev(s);
cout << s << endl; // olleh
return 0;
}
#include <iostream>
#include <string>
#include <algorithm>
using namespace std;
int main() {
string s = "hello";
reverse(s.begin(), s.end());
cout << s << endl; // olleh
return 0;
}