Hi everyone!

I recently come across this interesting topic of Round-Square Tree in the solution for the recent AtCoder Beginner Contest. This is the link for the editorial which refers the concept.

I find the idea interesting as it is simpler than the official solution which uses network flow. But I couldn't find much resources on the topic online. So if anybody knows about the topic or have some resources then please add them in the comments. Also if you know some questions related to this topic, do attach them in the comments.