作为全场最难的题，直接输出即可

#include<iostream> using namespace std; int main(){ cout<<"Good Luck!"; }

#include<iostream> using namespace std; int main() { cout <<"Good Luck!"; return 0; }

#include<bits/stdc++.h> using namespace std; int main(){ cout<<"Good Luck!"; return 0; }AC~

#include<iostream> using namespace std; int main(){ cout<<"Good Luck!"; return 0; }