Compilare: user.cpp: In function ‘void GetPrimeNumbers(int)’: user.cpp:35:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < primes.size() && 1LL * i * primes[j] <= n; ++ j) ~~^~~~~~~~~~~~~~~ user.cpp: In function ‘void GetPhi(int)’: user.cpp:42:9: warning: unused variable ‘nrPrimes’ [-Wunused-variable] int nrPrimes = primes.size(); ^~~~~~~~ user.cpp: In function ‘int GetAnswer(int)’: user.cpp:68:22: warning: unused variable ‘lim’ [-Wunused-variable] int ans = n + 1, lim = sqrt(n) + 1; ^~~ user.cpp: In function ‘int main()’: user.cpp:82:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &mod); ^