Compilare: user.cpp: In function ‘long int CM(long int)’: user.cpp:15:14: warning: unused variable ‘u’ [-Wunused-variable] long t=x,u; ^ user.cpp: In function ‘int main()’: user.cpp:67:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("date.in","r",stdin); ^ user.cpp:68:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("date.out","w",stdout); ^ user.cpp:69:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%ld%ld",&n,&m); ^ user.cpp:75:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%ld%ld%ld",&x,&y,&z); ^