It has been 1 month since the biggest Mathematics Olympiad in the world, named IMO (International Mathematics Olympiad) has been held virtually (due to COVID-19, of course) from 19th to 28th September 2020. This year, Russia acted as the organising country for this prestigious event for high schoolers all around the world. Frankly speaking, whenever this moment comes in each year, I always take a moment to be quite nostalgic about the last time I participated in this very same olympiad (which is actually 7 and 8 years ago. Yes, I participated twice in this olympiad). For some background, the format of this competition is that each participant needs to tackle 6 problems, divided into 2 days (so each day has 3 problems, and the problems are sorted based on difficulties for each day). Therefore, problem 1 and 4 are always the easiest in each day, followed by problem 2 and 5, and lastly the most difficult problems for each day are problem 3 and 6. For this year, I took some interest in the...