Compilare: user.cpp: In function ‘int main()’: user.cpp:26:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("nmult.in", "r", stdin); ^ user.cpp:27:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("nmult.out", "w", stdout); ^ user.cpp:29:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%lld%lld%lld", &n, &k, &dif); ^ user.cpp:42:47: warning: ‘P’ is used uninitialized in this function [-Wuninitialized] P = calc (P, crt, n - (dif - 1) * (k - 1)); ^ user.cpp:43:29: warning: ‘P_Q’ is used uninitialized in this function [-Wuninitialized] P_Q = calc (P_Q, 1, aux); ^