Compilare: user.cpp: In function ‘int main()’: user.cpp:42:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < Primes.size() && Primes[j] * Primes[j] <= X; ++ j) ^ user.cpp:55:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k = 0; k < Fact[j].size() && Good; ++ k) ^ user.cpp:60:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k = 0; k < Fact[j].size(); ++ k) ^ user.cpp:67:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k = 0; k < Fact[i].size(); ++ k) ^