Compilare: main.cpp: In function 'void find_factors()': main.cpp:34:32: warning: variable 'prime' set but not used [-Wunused-but-set-variable] std::vector<int>::iterator prime = primes.begin(); ^~~~~ main.cpp: In function 'void pinex()': main.cpp:60:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < factors.size(); j++) { ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:74:36: 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:75:38: 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:80:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ main.cpp:83:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %lld", &a, &b); ^