Eroare de compilare: main.cpp: In constructor 'InputReader::InputReader(const char*)': main.cpp:32:35: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, SIZE, in); ^ main.cpp: In member function 'void InputReader::advance()': main.cpp:55:39: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, SIZE, in); ^ ./cc1qncpV.o: In function `std::thread::thread<void (&)()>(void (&)())': main.cpp:(.text._ZNSt6threadC2IRFvvEJEEEOT_DpOT0_[_ZNSt6threadC5IRFvvEJEEEOT_DpOT0_]+0x2e): 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