Eroare de compilare: main.cpp: In function 'int main()': main.cpp:84:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < V.size(); ++i ) { ~~^~~~~~~~~~ main.cpp:70:13: warning: unused variable 'timp' [-Wunused-variable] clock_t timp = clock(); ^~~~ main.cpp:67:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "mergesort.in", "r", stdin ); ^ main.cpp:68:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "mergesort.out", "w", stdout ); ^ ./cclpIaV6.o: In function `MergeSort(int, int)': main.cpp:(.text+0x18e): undefined reference to `pthread_create' main.cpp:(.text+0x1de): 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