Compilare: main.cpp: In function 'int main()': main.cpp:43:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | for(int i = 0;i < primes.size() && primes[i] * primes[i] <= b; ++i) | ~~^~~~~~~~~~~~~~~ main.cpp:51:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for(int i = 0;i < v.size(); ++i) ans -= a / v[i]; | ~~^~~~~~~~~~ main.cpp:42:13: warning: unused variable 'z' [-Wunused-variable] 42 | int z = b; | ^