Hello Codeforces community!

On December 23, we organized the first International Lotfi Zadeh Olympiad in honor of well-known scientist Lotfi A. Zadeh. You can look at the olympiad website if you wish to know more about it.

We are also organizing the online mirror of the olympiad. Everyone is welcome to participate!

1. You will have 5 hours to solve 4 IOI like tasks.
2. Task statements will be available in English and Azerbaijani
3. Allowed programming language: C++
4. Submission limit per task: 50
5. Mirror contest will start at 24 December 2021, 22:00 (UTC +04) and will be available for 120 hours. You can take part in any 5 hours window of your choice.
6. Contest is available at http://217.160.75.124. You first need to register and then use the same username/password to log into the system.
7. The ranking of the online mirror will be available at http://217.160.75.124:8890/Ranking.html

Authors of the tasks are Nots0fast, TooNewbie, and Mamedov

UPD: Time has been extended to 120 hours.

UPD: Analysis mode in CMS is open until 08 January 2022, 23:00 (UTC +04)

UPD: Tasks and Solutions

Hello Codeforces Community,

As most of you know, IOI 2019 will be held in Baku, Azerbaijan. Since we are the organizing country next year, both the government and some local companies are interested in this event. On behalf of this event, we want to organize some training camps for our national team prior to IOI 2019. Now we are in need of some — maybe not world-class, but good coaches (e.g. IOI medalists from past years who are interested in teaching high school students) to invite them to Baku, Azerbaijan. The reasonable funding & costs will be covered. I want to know who is interested in this. If you are, please write a comment or if you want you can contact me via e-mail (rmammadov95@gmail.com). Also, if you know someone like this, please write his/her contacts below.

Another thing: If you know any international camps for high school students, please provide the name or link in the comment section.

Thanks in Advance.

How to calculate ?

Constraints are 1 ≤ N, M ≤ 2 * 10⁹, 1 ≤ x ≤ 50 and time limit is 1 second.

Please can someone help?