Compilare: main.cpp: In function 'std::vector<long long int> decompose(long long int)': main.cpp:32:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < primes.size() && 1LL * primes[j] * primes[j] <= number; j++) { ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:70:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pinex.in", "r", stdin); ^ main.cpp:71:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pinex.out", "w", stdout); ^ main.cpp:74:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &tests); ^ main.cpp:76:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld", &A, &B); ^