How are Codeforces submissions licenced?
I was wondering if I would be able to use other contestant's code (specifically, if I could use others' libraries for topics like geometry at World Finals)
I was also wondering if other people/companies are able to take code from submissions, and monetize them.
Thanks in advance!
Nopes, i don't think there is any licencing policy for submissions.
All the solutions can be viewed once the contest is over. And anyone can use them and i think that is great because that is how the community learns from each other.
There is a license for submissions and tasks materials, it's written also at the end of the help page. As for libraries, you would find their licenses on the web service they are hosted on (e.g. github).
The links you have only point to a license that governs distribution of CF-produced/owned materials, and not for contestants' code.