Eroare de compilare: main.cpp: In function 'void solve(int, int, std::__cxx11::string)': main.cpp:21:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<colier.size(); ++i) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:56:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<workers.size(); ++i){ ~^~~~~~~~~~~~~~~ ./ccZJDRVB.o: In function `std::future<std::result_of<std::decay<void (&)(int, int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)>::type (std::decay<int&>::type, std::decay<int&>::type, std::decay<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&>::type)>::type> std::async<void (&)(int, int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >), int&, int&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&>(std::launch, void (&)(int, int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >), int&, int&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&)': main.cpp:(.text._ZSt5asyncIRFviiNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEJRiS8_RS5_EESt6futureINSt9result_ofIFNSt5decayIT_E4typeEDpNSC_IT0_E4typeEEE4typeEESt6launchOSD_DpOSG_[_ZSt5asyncIRFviiNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEJRiS8_RS5_EESt6futureINSt9result_ofIFNSt5decayIT_E4typeEDpNSC_IT0_E4typeEEE4typeEESt6launchOSD_DpOSG_]+0x32d): undefined reference to `pthread_create' /usr/lib/gcc/x86_64-linux-gnu/6/libstdc++.a(thread.o): In function `std::thread::_M_start_thread(std::unique_ptr<std::thread::_State, std::default_delete<std::thread::_State> >, void (*)())': (.text._ZNSt6thread15_M_start_threadESt10unique_ptrINS_6_StateESt14default_deleteIS1_EEPFvvE+0x11): undefined reference to `pthread_create' /usr/lib/gcc/x86_64-linux-gnu/6/libstdc++.a(thread.o): In function `std::thread::_M_start_thread(std::shared_ptr<std::thread::_Impl_base>, void (*)())': (.text._ZNSt6thread15_M_start_threadESt10shared_ptrINS_10_Impl_baseEEPFvvE+0x5f): undefined reference to `pthread_create' collect2: error: ld returned 1 exit status Non zero exit status: 1