Compilare: main.cpp: In function 'int64_t solve()': main.cpp:21:28: warning: comparison of integer expressions of different signedness: 'int64_t' {aka 'long int'} and 'std::vector<long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for(int64_t it = 0; it < prime.size() && prime[it] * prime[it] <= b; it++){ | ~~~^~~~~~~~~~~~~~ main.cpp:33:30: warning: comparison of integer expressions of different signedness: 'int64_t' {aka 'long int'} and 'std::vector<long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | for(int64_t i = 0; i < bfs.size(); i++) | ~~^~~~~~~~~~~~