I'm going to solve CSES geometry section live on Saturday (tomorrow) while explaining and drawing stuff to make it educational. There are seven problems. We'll start with the cross-product recap and eventually get to Convex Hull and Closest Pair Of Points. No prewritten code.
Problems: https://cses.fi/problemset
Watch on Twitch or Youtube https://www.twitch.tv/errichto, https://youtu.be/G9QTjWtK_TQ. The latter will be available later to rewatch too.
Starts in 30 minutes!
A week later (23.01.2021), I will solve one remaining geometry problem — find the closest pair of points https://cses.fi/problemset/task/2194. See you on Saturday evening (17:00 CET).