Hello Codeforces!

I'm very super duper ultra excited to invite you to Weekend Practice round #7 , taking place on June 7, at 13:00 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.

Thanks a lot to:

• Denisov For The Supportive , Epic and ORZ Coordination ❤️‍🔥.
• Sergey Kolodyazhnyy for creating Eolymp 😎.
• De3b0o and MathModel for authoring problems .
• cadmiumky , Proof_by_QED , xGaz_ de_sousa , Ignut , barbie ,VladiG , tibinyte2006 , cowthecow , chromate00 , Kamikazee112 , Abito , Haidora , ALnQ417 , macaquedev , feining_for_gm, Aritro_ for testing the contest 🧪.

Score Distribution:

Sponsors

This round is sponsored by Acai Travel

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.

UPD2 : Editorials

Problem A

Problem B

Problem C

Problem D

Problem E

UPD3 : Congratulations to Top 10

1. turneja orz : ($$$950$$$ points ; $$$82\%$$$) $$$-\color{orange}{\text{Gold Medal}}$$$

2. liympanda orz : ($$$730$$$ points ; $$$63\%$$$) $$$-\color{silver}{\text{Silver Medal}}$$$

3. alexwice orz : ($$$690$$$ points ; $$$60\%$$$) $$$-\color{silver}{\text{Silver Medal}}$$$

4. Fikrat_Asadzadeh ($$$670$$$ points ; $$$58\%$$$) $$$-\color{silver}{\text{Silver Medal}}$$$

5. westilldonttrustyou ($$$670$$$ points ; $$$58\%$$$) $$$-\color{brown}{\text{Bronze Medal}}$$$

6. wery0 ($$$550$$$ points ; $$$48\%$$$) $$$-\color{brown}{\text{Bronze Medal}}$$$

7. CallmeHusyen ($$$552$$$ points ; $$$45\%$$$) $$$-\color{brown}{\text{Bronze Medal}}$$$

8. dudha369 ($$$490$$$ points ; $$$42\%$$$) $$$-\color{brown}{\text{Bronze Medal}}$$$

9. TheFuturoma ($$$490$$$ points ; $$$42\%$$$) $$$-\color{brown}{\text{Bronze Medal}}$$$

10. modest_hawking_803 ($$$490$$$ points ; $$$42\%$$$) $$$-\color{brown}{\text{Bronze Medal}}$$$

And T-Shirt Winners are :

1. fdg332

2. mefihwu

3. Horka

4. Nasa

5. The_Boolean_Nerd

6. kenti

7. levarko

8. user895997

9. user353134

10. user758519

Notes and Reflect

I Hope You enjoyed The problems and I personally want to hear feedback about the contest as well as our friend De3b0o, It's first contest for my friend De3b0o and he's asking you for feedback to improve.