Compilare: user.cpp: In function ‘int main()’: user.cpp:33:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (aux < a) ^ user.cpp:35:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (unsigned int j = aux; j <= b; j += r) ^ user.cpp:22:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nasa.in", "r", stdin); ^ user.cpp:23:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nasa.out", "w", stdout); ^ user.cpp:25:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a, &b); ^