Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:159: error: no match for ‘operator<’ in ‘fout.std::basic_ofstream<char, std::char_traits<char> >::<anonymous>.std::basic_ostream<_CharT, _Traits>::operator<< [with _CharT = char, _Traits = std::char_traits<char>](p1) < "\012"’ user.cpp:159: note: candidates are: operator<(const char*, const char*) <built-in> user.cpp:159: note: operator<(void*, void*) <built-in> user.cpp:44: warning: unused variable ‘j’ user.cpp:44: warning: unused variable ‘k’