Compilare: user.cpp: In member function ‘void InsertUndoMinConvexHull::print_current()’: user.cpp:153:48: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long long int’ [-Wformat=] printf("%d %d\n",it.first,it.second); ^ user.cpp:153:48: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long long int’ [-Wformat=] user.cpp: In function ‘int i32()’: user.cpp:194:32: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,LEN,f); ^ user.cpp:202:32: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,LEN,f); ^