Compilare: user.cpp: In function ‘int main()’: user.cpp:40:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < primes.size() && 1LL * primes[i] * primes[i] <= p; i++){ ^ user.cpp:24:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("far.in", "r", stdin); ^ user.cpp:25:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("far.out", "w", stdout); ^ user.cpp:36:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &nrt); ^ user.cpp:38:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &m, &p); ^