Compilare: main.cpp: In function 'std::vector<int> factorNumber(long long int)': main.cpp:15:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < primes.size() && 1ll * primes[i] * primes[i] <= n ; i++) { ~~^~~~~~~~~~~~~~~ main.cpp: In function 'bool is_ok(long long int, long long int)': main.cpp:46:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < factors.size() ; i++) { ~~^~~~~~~~~~~~~~~~ main.cpp:66:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < factorsA.size() ; i++) { ~~^~~~~~~~~~~~~~~~~ main.cpp:70:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < factorsB.size() ; i++) { ~~^~~~~~~~~~~~~~~~~