Hello Codeforces!

I'm excited to invite you to Weekend Practice round #12 , taking place on 26th October, at 14:00 UTC. This is a rated contest at Eolymp.

Format and Difficulty

Same as in previous rounds, the competition is primarily aimed at improving practical skills. There will be $$$2$$$ hours for $$$5$$$ tasks of varying difficulty, the easiest of which can even be solved by beginners.

The scoring for each task being block-based (meaning points are awarded for each block of tests separately, and only if the solution passes all tests in the block). If there is a tie between two participants, the one whose last productive submission (i.e., a submission that added at least one point) was made earlier will be ranked higher in the leaderboard.

The statements will be available in the following languages: English, Ukrainian, French, Spanish, Azerbaijani, Russian.

Registration

You can join the competition on the competition page.

Prizes

The top-10 participants of the competition, as well as 10 random participants from those who rank from 11th to 100th place, will receive prizes in the form of t-shirts. Please, note, that we have changed how prizes are awarded,

Visit Frequently Asked Questions section to learn more.

Credits

• MathModel For Coordinating The Round 😎.
• MathModel , turneja and frostcat for authoring problems 🔥 .
• Sergey Kolodyazhnyy for creating Eolymp 😎.
• Denisov for Ukrainian and Russian Translations.
• Denisov , SmolBrain , JahonaliX , de_sousa , Timosh , turneja , De3b0o , Too_Weak_To_Anything , Seriously_Its_Sameer , hxu10 , Davy_D._Kaosar , chromate00 , Mousa_Aboubaker for testing the contest 🧪.

Scoring

Sponsors

This round is sponsored by Acai Travel.

Acai Travel is a seed-stage startup using AI to transform customer support in the travel industry. With $4M in funding and partnerships with leading global brands, our AI assistant integrates with travel and airline systems to deliver real-time information, automate ticket routing, analyze sentiment, and generate smart auto-replies—boosting efficiency and enhancing customer experiences.

We work with cutting-edge AI to solve real problems, not to chase trends. Our team, based in New York, Barcelona, and Pune, builds practical solutions rooted in strong values, curiosity, and a culture that fosters innovation and positive change.

Visit acaitravel.com

First AC :

A : Glauco

B : kimononawa

C : kimononawa

D : rolandpetrean

E : NA

Congratulations to Winners :

1. rolandpetrean

2. liympanda

3. kimononawa

4. Almonther

5. ajinkya1p3

Editorials

Problem A

Problem B

Problem C

Problem D

Problem E