Compilare: main.cpp: In function 'long long int Solve(std::vector<int>)': main.cpp:98:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.size(); ++i) ~~^~~~~~~~~~ main.cpp:110:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < a.size(); ++i) ~~^~~~~~~~~~ main.cpp:91:9: warning: unused variable 'nr_prime' [-Wunused-variable] int nr_prime = Ciur(); ^~~~~~~~