Compilare: user.cpp:2:15: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main(int64_t N){std::ifstream("fetite.in")>>N;std::ofstream("fetite.out")<<(N<<1|N>>31);} ^ user.cpp:2:1: warning: first argument of ‘int main(int64_t)’ should be ‘int’ [-Wmain] main(int64_t N){std::ifstream("fetite.in")>>N;std::ofstream("fetite.out")<<(N<<1|N>>31);} ^~~~ user.cpp:2:1: warning: ‘int main(int64_t)’ takes only zero or two arguments [-Wmain]