Fast input/output in competitive programming

Question

I have come across this particular snippet of code many times in solutions of competitive programming contests. I understand the basic use of this code to beat time limits b

Answer 1

try this for faster I/O

ios_base::sync_with_stdio(false); cin.tie(NULL);

It sets whether the standard C++ streams are synchronized to the standard C streams after each input/output operation. By default, iostream objects and cstdio streams are synchronized.