Compilare: main.cpp: In function 'int main()': main.cpp:44:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | for ( int d = 0; d < primes.size () && primes[d] * primes[d] <= num; d++ ) | ~~^~~~~~~~~~~~~~~~ main.cpp:56:32: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare] 56 | for ( int j = 0; j < m; j++ ) | ~~^~~