Compilare: user.cpp: In function ‘void Sieve()’: user.cpp:24:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < primes.size() && primes[j] <= lowDiv[i] && i * primes[j] <= vMax; j++) ^ user.cpp: In function ‘int NonComprimeSum(int)’: user.cpp:60:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < pDiv.size(); j++) { ^ user.cpp: In function ‘int main()’: user.cpp:78:11: warning: unused variable ‘j’ [-Wunused-variable] int i, j, winChance = 0, gcd; ^