Since usually there's no editorial for this contest (already on Gym), I wrote explanations to my team's solutions during the contest, they're available at https://github.com/tfg50/competitive-programming-solutions/blob/main/editorial.pdf. I'll organize the repository tomorrow along with uploading the solutions' code. Feel free to share your opinions on the problems, ask questions, and perhaps comment on some of the alternative solutions that I didn't mention or explain.