Main.cc:2:1: error: ‘define’ does not name a type; did you mean ‘rewind’? define int long long ^~~~~~ rewind Main.cc: In function ‘int main()’: Main.cc:4:1: error: ‘ios’ has not been declared ios::sync_with_stdio(false); ^~~ Main.cc:5:1: error: ‘cin’ was not declared in this scope cin.tie(0),cout.tie(0); ^~~ Main.cc:5:1: note: suggested alternative: In file included from Main.cc:1:0: /usr/include/c++/7/iostream:60:18: note: ‘std::cin’ extern istream cin; /// Linked to standard input ^~~ Main.cc:5:12: error: ‘cout’ was not declared in this scope cin.tie(0),cout.tie(0); ^~~~ Main.cc:5:12: note: suggested alternative: In file included from Main.cc:1:0: /usr/include/c++/7/iostream:61:18: note: ‘std::cout’ extern ostream cout; /// Linked to standard output ^~~~