Hello. Recently, I started participating on AtCoder contests, and in many cases, I don't see announcements on codeforces, or any posts for discussing the problems. I remember that before, it was very frequent to see at least one AtCoder Contest-related post among the recent actions.

Is there a reason behind it?

Also, maybe we can use this post to discuss about the last ABC.

Hello everybody. I wonder if there are some dates scheduled for the next SWERC. And there's no way of assuming a date, because the dates of past SWERC editions have changed in terms of months from one year to the other.

Does someone know?

Hello everyone. I saw recently a comment about an app for macOS that allows you to use CompetitiveCompanion in Safari (Big Sur); it's basically a translation of the original extension. It's called Codeforces Web Tool. It also has the Codeforces Rating Prediction feature. Since I didn't know about it until some months/weeks ago, this could have happened to other folks too.

This is the app.

Hello Codeforces. Tomorrow begins the CIIC 2020 (Ibero-American Contest in Informatics); it is the regional competition for Ibero-American Countries, similar to CEOI, but it is online. I just want to know which are the contestants from each participating country.

I think these are the ones going from Cuba (this is unofficially):

• humbertoyusta

• Leonardo16

• MDario

• albertolg101

• Ernest0_0Abreu

• EduardoBrito

• dmesadiaz

• vextroyer

• arciel

• pedropap

• danielarrom

UPD: This is the ranking of countries (sorry for bad quality of image).

UPD: Here is the individual ranking,

UPD: Now you can do virtual participation here. Unfortunately it is only available in Spanish.

Recently I've been studying some geometry, and now I want to know the different ways of computing the extremal Points on a set of points for a fixed direction, please leave it in the comments.

Thanks in advance.

Hello, how can Kruskal's algorithm be modified to run in O(n^2) time in a dense graph of n nodes??

Does anyone know when the equipment and software that will be used in IOI 2019 will be published, and why have not they done so yet?