Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:12:9: warning: unused variable ‘result’ [-Wunused-variable] int result = 1; ^ /tmp/ccMVE0tv.o: In function `std::iterator_traits<std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> > >::difference_type std::distance<std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> > >(std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> >, std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> >)': user.cpp:(.text._ZSt8distanceISt14regex_iteratorIN9__gnu_cxx17__normal_iteratorIPKcSsEEcSt12regex_traitsIcEEENSt15iterator_traitsIT_E15difference_typeESA_SA_[_ZSt8distanceISt14regex_iteratorIN9__gnu_cxx17__normal_iteratorIPKcSsEEcSt12regex_traitsIcEEENSt15iterator_traitsIT_E15difference_typeESA_SA_]+0x1a): undefined reference to `std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> >::regex_iterator(std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> > const&)' user.cpp:(.text._ZSt8distanceISt14regex_iteratorIN9__gnu_cxx17__normal_iteratorIPKcSsEEcSt12regex_traitsIcEEENSt15iterator_traitsIT_E15difference_typeESA_SA_[_ZSt8distanceISt14regex_iteratorIN9__gnu_cxx17__normal_iteratorIPKcSsEEcSt12regex_traitsIcEEENSt15iterator_traitsIT_E15difference_typeESA_SA_]+0x2a): undefined reference to `std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> >::regex_iterator(std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> > const&)' user.cpp:(.text._ZSt8distanceISt14regex_iteratorIN9__gnu_cxx17__normal_iteratorIPKcSsEEcSt12regex_traitsIcEEENSt15iterator_traitsIT_E15difference_typeESA_SA_[_ZSt8distanceISt14regex_iteratorIN9__gnu_cxx17__normal_iteratorIPKcSsEEcSt12regex_traitsIcEEENSt15iterator_traitsIT_E15difference_typeESA_SA_]+0x3c): undefined reference to `std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> >::operator++()' user.cpp:(.text._ZSt8distanceISt14regex_iteratorIN9__gnu_cxx17__normal_iteratorIPKcSsEEcSt12regex_traitsIcEEENSt15iterator_traitsIT_E15difference_typeESA_SA_[_ZSt8distanceISt14regex_iteratorIN9__gnu_cxx17__normal_iteratorIPKcSsEEcSt12regex_traitsIcEEENSt15iterator_traitsIT_E15difference_typeESA_SA_]+0x4b): undefined reference to `std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> >::operator!=(std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> > const&)' /tmp/ccMVE0tv.o: In function `main': user.cpp:(.text.startup+0x163): undefined reference to `std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> >::regex_iterator(__gnu_cxx::__normal_iterator<char const*, std::string>, __gnu_cxx::__normal_iterator<char const*, std::string>, std::basic_regex<char, std::regex_traits<char> > const&, std::bitset<11u>)' user.cpp:(.text.startup+0x171): undefined reference to `std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> >::regex_iterator()' user.cpp:(.text.startup+0x183): undefined reference to `std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> >::regex_iterator(std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> > const&)' user.cpp:(.text.startup+0x19b): undefined reference to `std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> >::regex_iterator(std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> > const&)' collect2: error: ld returned 1 exit status