Compilare: main.cpp: In function 'int main()': main.cpp:30:21: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for(ll i=0;i<primes.size() and primes[i]*primes[i]<=b;++i) | ~^~~~~~~~~~~~~~ main.cpp:41:25: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | for(ll i=0;i<dv.size();++i,mask>>=1) | ~^~~~~~~~~~