1. [Why is it not recommended to use std::endl?](http://www.nekko.cn:1234/article/4) 2. [Significance of ios::sync_with_stdio(false); cin.tie(NULL);](http://www.nekko.cn:1234/article/5) 3. [Compilation Error: "Compiled file is too large"](http://www.nekko.cn:1234/article/6)