Compilare: user.cpp: In function ‘int main()’: user.cpp:18:22: warning: unused variable ‘j’ [-Wunused-variable] int n, d, ok, i, j, pd; ^ user.cpp:14:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("unter.in","r",stdin); ^ user.cpp:15:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("unter.out","w",stdout); ^