#include <iostream>
using namespace std;
int main() {
string s = "Hello World!";
cout << s.find("H") << endl; // 0
cout << s.find("e") << endl; // 1
cout << s.find("ee") << endl; // 18446744073709551615
cout << s.find("l") << endl; // 2
cout << s.find("ll") << endl; // 2
cout << s.find("lll") << endl; // 18446744073709551615
cout << s.find("z") << endl; // 18446744073709551615
}
#include <iostream>
using namespace std;
int main() {
string s = "Hello World!";
cout << (s.find("ll") != string::npos) << endl; // 1 (exits)
cout << (s.find("dd") != string::npos) << endl; // 0 (not exists)
}
