Hello, Codeforces!

I'm glad to invite you to Grakn Forces 2020, which will be held on 30.09.2020 17:35 (Московское время). It will be combined rated round for both divisions.

This round is initiated and supported by Grakn Labs. More information you could find here.

All problems were authored and prepared by 300iq and isaf27. Thanks to coderz189, Retired_cherry, QAQAutoMaton, Prakash11, morzer, qlf9, nkamzabek, gdb_18, talibmohd, Dragnoid99, KAN and VladGanzha for testing problems and good advice. Thanks to MikeMirzayanov for great systems Codeforces and Polygon.

You will be given 9 problems and 2 hours 30 minutes to solve them. Please, read all the problems. Good luck, have fun and we wish everyone high ratings!

Thanks to Grakn Labs for the gifts to the participants:

Prizes:

• 1st place = 500 euros
• 2nd place = 250 euros
• 3rd place = 100 euros

Additional Prizes:

Top 50 receive:

Grakn Labs swag pack:

• Stickers
• Grakn Labs t-shirt

Random 50 from 51-250 receive:

Grakn Labs swag pack:

• Stickers
• Grakn Labs t-shirt

Grakn Labs is a team of people driven by a purpose: to solve the world's most complex problems, through knowledge engineering. They are the inventors of the Grakn knowledge graph and the Graql query language. Their technology helps organizations in various industries, including Life Sciences, Defence & Security, Financial Services, and Robotics, to build intelligent systems that will change the world.

Grakn Labs looking for the best to round out their team, if you think this sounds like an interesting chance to work on an innovative technology; they'd love to hear from you.

UPD! Scoring distribution: 500 — 1000 — 1250 — 2000 — 2500 — 2500 — 3000 — 3750 — 3750