CP_imp_concepts

ios_base::sync_with_stdio(false); cin.tie(NULL);//used for fast input output
--scanf,printf is faster than cin,cout but we can use cin,cout and achive the same speed 
//ios_base :: sync_with_stdio(false):It desynchronize all the C++ standard streams with their corresponding standard C streams
//cin.tie(NULL) :tie() is a method which simply guarantees the flushing of std::cout before std::cin accepts an input. 
This is useful for interactive console programs which require the console to be updated constantly 
but also slows down the program for large I/O. The NULL part just returns a NULL pointer.