Compilare: main.cpp: In function 'void solve(long long int)': main.cpp:39:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | for(int i=0;i<prime.size() && prime[i]*prime[i]<=n;i++) | ~^~~~~~~~~~~~~