Codeforces has an excellent archive of training contests, named gyms!
But it is very well possible that you do not know about the one gym that I want to cover today, and the reason is that it is only available in Russian :|
I translated the statements to English for you, and recorded a problem walkthrough with theoretical material included, in case you ever get stuck or want to refresh the theory.
We will cover more gyms from this old but gold series by Saint Petersburg State University in the future, so stay tuned!
Thanks for the translation!
Btw, how about including your English statement into the contest materials?
I cannot do it myself, but if the people responsible for the statements want to include my translations, then I definitely don't mind and would love to translate the entire series
I just realized that with my new rating I can add the statements to gyms myself. I added all already translated statements and will continue adding any further statements as I translate them.