Hello Readers, I have seen that many people don't use scanf or cin or cout or printf but their own input output functions . I have heard that some people were able to pass "naive" algorithm under time limit with the help of optimizations. I would love if everyone here would share their optimization codes and explain meaning of every line so that "everyone" would get it in C++. I only know ios_base::sync_with_stdio(false); cin.tie(0); Also I don't understand the meaning of these lines. Thanks for your efforts. :)