1534A - Colour the Flag

Author: crackersamdjam

1534B - Histogram Ugliness

Author: Dormi

1534C - Little Alawn's Puzzle

Author: Ninjaclasher

1534D - Lost Tree

Author: Plasmatic

1534E - Lost Array

Author: Plasmatic

1534F1 - Falling Sand (Easy Version)

Author: Dormi

1534F2 - Falling Sand (Hard Version)

Author: Dormi

1534G - A New Beginning

Author: Aaeria

Tests generator

1534H - Lost Nodes

Author: Ninjaclasher

Hello, Codeforces!

Welcome to the Codeforces LATOKEN Round 1 (Div. 1 + Div. 2) supported by LATOKEN, that will start on Jun/13/2021 18:35 (Moscow time). It will be a combined rated round for both divisions (and div 3). Please, note the unusual start time.

All problems were created by Aaeria, crackersamdjam, Dormi, Ninjaclasher, and Plasmatic.

We would like to thank:

• Valentin Preobrazhenskiy from LATOKEN supporting the round.
• 300iq and KAN for coordinating the round and answering our relentless questions.
• arvindr9, Delmos, duality, coderz189, wxhtzdy, PurpleCrayon, kalki411, socho, wleung_bvg, and Zeyu for their invaluable advice and suggestions.
• MikeMirzayanov for great systems Codeforces and Polygon.

You will be given 8 problems and 180 minutes to solve them. This contest features at least one interactive problem, so we recommend reading the guide of interactive problems before the contest.

We hope that statements are short and pretests are strong and that you find the problems interesting! Good luck, have fun, and we wish everyone high ratings!

The scoring distribution will be announced closer to the beginning of the round.

Thanks to LATOKEN, winners will get awesome swag:

• 1st place = MacBook Air M1 + Job offering and Stock Options
• 2nd place = Xiaomi Mi 11 + Job offering and Stock Options
• 3rd place = Xiaomi Mi Notebook Pro 15" Enhanced Edition + Job offering and Stock Options
• 4th-10th place = Job offering and Stock Options + Merchandise Pack
• 11th-55th place = Merchandise Pack

Random 10 participants outside of top-55, who solved at least one problem and participated in rated Codeforces rounds before, will get a t-shirt!

A few words from the LATOKEN team:

We welcome you to the intellectual battle between the best coders from around the world! LATOKEN strives to make trading crypto as easy as having a social media account. We are always looking for the best of the best to join our team. As a result, LATOKEN is currently in Coingecko’s Top 15 with over 600 000 app installs within just one year from its launch and 1m+ users in total. The emerging blockchain based financial systems will open exciting opportunities, because crypto is fully global and mostly independent of conservative banks.

If you want to become a part of something bigger, work remotely with a team of international professionals and change the world, contact our recruiters for internships and employment opportunities in the LATOKEN team. Use our bot or fill out the form below and tell us a little about yourself.

UPD: The scoring distribution is 500 — 1000 — 1250 — 1500 — 2250 — (1750 — 1250) — 3250 — 3500.

UPD: Editorial

Congratulations to the winners:

1. Benq
2. tourist
3. Radewoosh
4. Endagorion
5. ecnerwala
6. heno239
7. VivaciousAubergine
8. gamegame
9. Pyqe
10. maroonrk

The prizes will be distributed in the next few days after we remove cheaters.