Compilare: user.cpp: In function ‘void sieve()’: user.cpp:22:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < primes.size() && primes[j] <= low[i] && primes[j] * i <= VALMAX; ++ j) ^ user.cpp: In function ‘int main()’: user.cpp:73:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("shukarime.in", "r", stdin); ^ user.cpp:74:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("shukarime.out", "w", stdout); ^