Compilare: main.cpp: In function 'int main()': main.cpp:56:46: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 56 | while(prime[pos]*prime[pos]<=x && pos<prime.size()) | ~~~^~~~~~~~~~~~~ main.cpp:55:25: warning: unused variable 'd' [-Wunused-variable] 55 | long long int p,d=2,pos=0; | ^