Hello, Codeforces!

I'm very glad to invite you to participate in CodeTON Round 4 (Div. 1 + Div. 2, Rated, Prizes!), which will start on Mar/31/2023 17:35 (Moscow time).You will be given 8 problems and 2 hours to solve them. The round will be rated for everyone.

I'd like to give my sincere thanks to:

• 74TrAkToR for the wonderful coordination!

• Sulfox for the help with the statements.

• Suika_predator, SSerxhs, apeiya, xay5421, NemanjaSo2005, applese, bxhnb, fr200110217102, Sulfox, DF_3Mz PaperCloud, CedeaT0, Kath1031, jcccc, dyxg, tzc_wk, xiaoziya, qiqi20021026, Pointy, HorizonWind, ilyakrasnovv, ShmilyTY, njupt_lyy, rsj,hzr, p_b_p_b, ak2006, flakes24, Milesian, pb0207, _Vanilla_, Lavine, alwyn and MagicalFlower for testing the round.

• MikeMirzayanov for the great codeforces and polygon platform.

• You for take part in the round.

Hope everyone can enjoy the round!

\textbf{UPD}: The tutorial is here.

And here is the information from our title sponsor:

Hello, Codeforces!

We, the TON Foundation team, are pleased to support CodeTON Round 4.

The Open Network (TON) is a fully decentralized layer-1 blockchain designed to onboard billions of users to Web3.

Since July 2022, we have been supporting Codeforces as a title sponsor. This round is another way for us to contribute to the development of the community.

The winners of CodeTON Round 4 will receive valuable prizes.

The first 1,023 participants will receive prizes in TON cryptocurrency:

• 1st place: 1,024 TON
• 2–3 places: 512 TON each
• 4–7 places: 256 TON each
• 8–15 places: 128 TON each
• …
• 512–1,023 places: 2 TON each

We wish you good luck at CodeTON Round 4 and hope you enjoy the contest!