Compilare: user.cpp: In function ‘void Read()’: user.cpp:37:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 1 ; i <= n ; i ++ ) ^ user.cpp:35:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%llu" , &n ); ^ user.cpp:38:49: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%llu%llu" , &v[i].x , &v[i].y ); ^ user.cpp: In function ‘int main()’: user.cpp:81:27: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen (IN,"r",stdin); ^ user.cpp:82:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen (OUT,"w",stdout); ^