Compilare: user.cpp: In function ‘int main()’: user.cpp:32:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < P.size() && P[i] * P[i] <= n; i ++) ^ user.cpp:55:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < D.size(); j ++) ^ user.cpp:31:15: warning: unused variable ‘n_aux’ [-Wunused-variable] long long n_aux = n; ^