Hello Codeforces! I wanted to invite you to participate in the 6th Stage of the 2nd Universal Cup, which will be held from October 21st to 22nd.

The contest is made of problems from the finals of Potyczki Algorytmiczne (a.k.a. Algorithmic Engagements) from the last couple of years, which is the biggest open polish programming competition. There will be two such contests held as Universal Cup stages and in the upcoming weekend you'll be able to face the first of them.

If you participated in any of the PA2020, PA2021, PA2022 or PA special edition finals, or happen to know the problems, please don't compete in this contest.

Problems used in the upcoming contest are authored by me and mnbvmar. Also a huge round of applause for kostka, who helped a lot in organization of each edition of PA, coordinated this contest and translated all the statements!

You can participate in the contest in the following time windows:

• 02:00 (UTC) on Saturday ~ 07:00 (UTC) on Saturday

• 05:00 (UTC) on Saturday ~ 10:00 (UTC) on Saturday

• 08:00 (UTC) on Saturday ~ 13:00 (UTC) on Saturday

• 11:00 (UTC) on Saturday ~ 16:00 (UTC) on Saturday

• 13:00 (UTC) on Saturday ~ 18:00 (UTC) on Saturday

• 15:00 (UTC) on Saturday ~ 20:00 (UTC) on Saturday

• 18:00 (UTC) on Saturday ~ 23:00 (UTC) on Saturday

UPD: Meta Hacker Cup Round 2 will take place this Saturday, so we added two more windows:

• 15:00 (UTC) on Sunday ~ 20:00 (UTC) on Sunday

• 18:00 (UTC) on Sunday ~ 23:00 (UTC) on Sunday

You can find all the information about the upcoming stages here: https://ucup.ac