Compilare: main.cpp: In function 'void multiply(std::vector<std::complex<double> >&, std::vector<std::complex<double> >)': main.cpp:58:43: warning: narrowing conversion of '((ll)(((std::value_type<std::allocator<std::complex<double> >, std::complex<double> >*)((std::vector<std::complex<double>, std::allocator<std::complex<double> > >*)a)->operator[]()((std::vector<std::complex<double>, std::allocator<std::complex<double> > >::size_type)i))->std::complex<double>::real()() + 5.0e-1) % ((long long int)MOD))' from 'll' {aka 'long long int'} to 'double' [-Wnarrowing] 58 | a[i] = {((ll)(a[i].real() + 0.5)) % MOD, 0}; | ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~