A time ago, I read this blog: aleigorithms — ICPC Latin American Regional – 2017

In that blog the author says "This is not an original problem. Is sad to see this kind of problems in an ICPC regional." when are explaining the solution to the problem (F — Fundraising).

A weeks ago I was talking with a friend about the 2017 Latin America Regional, and he told me that the problem I — Imperial roads is a classical/old question and not original and it's linked as a recomended problem on a tutorial.

I looked a while trying to find the "original" problems and the tutorial, but until now I cannot find it.

Somebody know where are the "original" problems?