Central European Regional Contest 2023
This is the website of the Central Europe Regional Programming Contest 2023, a regional contest of the International Collegiate Programming Contest.
The competition will take place in Ljubljana from 8. December to 10. December 2023.
University students from eight countries (Austria, Croatia, Czech Republic, Hungary, Latvia, Poland, Slovakia and Slovenia) will participate in the CERC regional contest and the best teams will advance to ICPC World Finals.
We are proud to organize this competition in the years 2021–2023.
- 1. 10. 2023:
- Registration for teams is open.
- 17. 11. 2023:
- Registration for teams is closed.
- 20. 11. 2023:
- Team acceptance decisions entered into the system.
- 24. 11. 2023:
- Deadline for assigning contestants into teams, and to completely fill their details (mainly badge & certificate names with diacritics, T-shirt size).
- 30. 11. 2023:
- Deadline for transferring the registration fee
- 8. 12. 2023:
- CERC start
- 10. 12. 2023:
- CERC end
The contest will take place on a weekend from 8. December to 10. December 2023.
Saturday: Practice Contest
|10:00–10:30||Opening Ceremony (PA)|
|10:30–11:30||Lectures & Presentations (PA)|
|11:30–12:00||Contest Rules (PA)|
|13:30–14:30||Practice Contest (PR5-PR17)|
|16:00–16:30||Questions & Answers (PA)|
Sunday: Contest & Award Ceremony
|17:00–18:00||Problemset Discussion (PA)|
|18:00–21:00||Award Ceremony (PA) &
Participation and eligibility
Eligibility of CERC 2023 teams
The coach certifies the eligibility of contestants and serves as the official point-of-contact with the team prior to and during contest activities.
According to ICPC Regional Rules, all contestants have to be eligible by satisfying the Rules and the Eligibility Decision Tree. The host must bring a completed and signed eligibility form at registration. See the schedule for deadlines.
Participation fee for all participants (contestants, coaches, attendees) is 60 € per person and has to be transferred to the bank account below. See the schedule for deadlines. The fee covers the organization of the contest, all welcome materials, T-shirt, lunch on Saturday, refreshments during the contest, banquet dinner on Sunday.
Participation fee is payable only by a bank transfer to the account below. Please make a note of the following instructions for sending a wire transfer:
- The sender must pay all appropriate wire transfer charges in addition to the registration fee. This fee should include any additional intermediary bank fees. Bank fees should not be "shared".
- The registrant is responsible for any and all differences in what is actually received by the University of Ljubljana, Faculty of Computer and Information Science, Ljubljana, Slovenia in order to avoid an outstanding balance.
- Once the wire transfer transaction has been completed, please email a copy of the wire transfer receipt to the following email address: email@example.com
- Please allow enough time for the payment to be received before the start of CERC 2023.
- The following bank details must be used in order for CERC 2023 to accurately associate payment with your registration:
Account holder: UL FRI
Account holder address: Vecna pot 113, 1000 Ljubljana, Slovenia
Bank Name: Banka Slovenije
Bank address: Slovenska 35, 1505 Ljubljana, Slovenia
IBAN: SI56 0110 0603 0708 768
Details: University of ..., CERC 2023 (example: University of Ljubljana, CERC 2023)
The General Rules of the 2023 Regional Competitions are published on the ICPC website.
Only teams accepted by the Regional Contest Director can take part in the contest.
All team members must attend all contest activities as specified in the schedule. The Coach is expected to be available during contest activities. Failure to attend any of the designated contest events can result possibly in the disqualification and forfeiture of any prizes.
Conduct of the Contest
At least six problems will be posed. As far as possible, problems will avoid dependence on detailed knowledge of a particular applications area or a particular contest language. The language of the contest is English. All written contest materials and all communication with the contest officials will be in English. Contestants may bring resource materials such as books, manuals, notes and program listings. Contestants may not bring any machine-readable versions of software or data. Contestants may neither bring their own computers, computer terminals and calculators nor any kind of electronic devices such as headphones, radio sets, cellular phones, smart gadgets, etc. Food and drinks are subject to local rules, but are generally allowed.
As an exception to the previous rule, a team may bring their own keyboard (standard USB keyboard without wireless connectivity, memory, etc.). Proctors should examine the keyboards before the contest.
Solutions to problems (source code) submitted for judging are called submissions. Each submission is judged as accepted or rejected and the team is notified of the result. Additional information about the reason for the rejection is described in the contest system. A contestant may submit a question about a task through the judge system. If the judges agree that there is an ambiguity or error in the task statement, a clarification will be issued to all contestants. Contestants are not to converse with anyone except members of their own team and personnel designated by the Regional Contest Director or local proctors. System support staff may advise contestants on system-related problems such as explaining system error messages. The contest will be held in a networked environment. The network may only be used to submit solutions, to ask questions, back up the solutions and to produce listings in ways designated by the organizers. Any other use of the network is strictly forbidden and shall result in immediate disqualification and removal from the contest area.
While the contest is scheduled to last five hours, the Regional Contest Director has the authority to alter the length of the contest in the event of unforeseen difficulties. Should the contest duration be altered, every attempt will be made to notify contestants in a timely and uniform manner.
A team may be disqualified by the Regional Contest Director for any activity that jeopardizes the contest, such as dislodging extension cords, unauthorized modification of contest materials (hardware of software), forbidden network activities or distracting behavior. The Regional Contest Director is solely responsible for ruling on unforeseen situations and interpreting these Rules.
Scoring of the Contest
A problem is solved when it is accepted by the judges. The judges are solely responsible for accepting or rejecting the submitted runs. In consultation with the judges, the Regional Contest Director determines the winners of the regional contest. The Regional Contest Director and judges have the authority to adjust for or adjudicate unforeseen events and conditions. Their decisions are final.
Team ranking details are described in the information page of the contest system.
The judge system is available at putka-cerc.acm.si. The environment details are described in the information page of the contest system. The minor details may change up to the practice session.
Supported languages are:
Documentation is available on the judge system. All problems are guaranteed to be solvable in C/C++. We offer no guarantees about the other supported languages.
Provided computers are running Xubuntu operating system. A number of editors and IDEs will be provided. These will include:
- Kate, Emacs, Vim, Geany, Nano
- Visual Studio Code, CodeBlocks, Eclipse, IntelliJ IDEA, PyCharm
- gdb, Valgrind
Computer rooms have different keyboards, which you can see below (click to enlarge). If you wish, you can bring your own keyboard.
The contest system can be accessed at https://putka-cerc.acm.si/.
The final results will be published below once the contest has been concluded.
A gallery of promotional videos is available below.
University of Ljubljana, Faculty of Computer and Information Science
All CERC 2023 activities will be held at the Faculty of Computer and Information Science, University of Ljubljana, Večna pot 113, 1000 Ljubljana.Introduction video: https://www.youtube.com/watch?v=A6bN79AK4SY
The faculty is about 40 minutes walking distance from the city center, but you can also take buses 14 or 18. Specifically, the closest but stations to the faculty are:
- Bus 18, closest stop "Živalski vrt – ZOO", direction "Kolodvor" is towards the city center, direction "Litostroj" is away from the center
- Bus 14, closest stop "Viško polje", direction "Savlje" is towards the city center, direction "Bokalce" is away from the center
More detailed instructions are available on the faculty website. See also the live map for immediate navigation and the Location tab for international travel.
You can travel to Ljubljana by train, bus or plane. International trains and buses usually arrive at the main train and bus station, and you can then use the local public LPP bus network to get around the city (see the Venue tab for instruction on getting to the faculty). There are cheap direct daily trains to Budapest, Vienna, and Zagreb, as well as connections to Prague and Bratislava.
For travelling by plane, the most convenient airport is the Ljubljana Airport (airport code LJU), with regular direct flights to Warsaw. You can also consider flying to Trieste (TRS), or Zagreb (ZAG). For getting from the Ljubljana Airport to the city center, it's best to book a shuttle beforehand.
Slovenia is bordered by Italy to the west, Austria to the north, Hungary to the northeast, Croatia to the south and southeast, and the Adriatic Sea to the southwest. Four major European geographic regions meet in Slovenia: the Alps, the Dinarides, the Pannonian Plain, and the Mediterranean Sea. The alpine region is home to the highest peak, Triglav, at 2864 m, as well as many glacial lakes, like Bohinj and Bled. The littoral region is famous for the Karst Plateau and its caves, such as the Postojna Cave and Škocijan Caves.
The total surface area is around 20.271 square kilometers, more than half of which is covered by forests. The population of Slovenia is around 2.1 million people, the official language is Slovenian and the official currency is euro.
More information is available at www.slovenia.info.
Ljubljana is the capital and largest city of Slovenia, with approximately 300.000 inhabitants. It is the historical, cultural, educational, economic, political and administrative centre of the country. The city is located roughly in the center of the country in the Ljubljana Basin and Ljubljana Marshes. The area has been populated since around 2000 BC, with pile dwellings and the oldest wooden wheel in the world found from the prehistoric times, and with remnants of the Roman settlement Emona still standing in the city centre today. The Castle of Ljubljana was constructed in the 11th century and the surrounding settlement grew into the capital of the Habsburg province of Carniola and then into the city as we know today.
The river Ljubljanica flows through the city centre at the base of Castle Hill. The symbol of the city is the Ljubljana Dragon, which is depicted on the top of the tower of Ljubljana Castle in the Ljubljana coat of arms, and on the Dragon Bridge. The central square in Ljubljana is Prešeren Square featuring a triple bridge over the Ljubljanica river. You'll find that the Ljubljana old towm is small and everything is in walking distance, such as the Congress square (featuring University headquarters) and the Republic square (featuring Slovenian parliament). Ljubljana Castle is also nearby, a short 10 minute climb at the elevation of 366 meters (as opposed to the base elevation of 295 meters), and offers great view of the city as well as free entry into the castle courtyard.
More information is available at www.visitljubljana.com.
To help you a bit with the decisions on where to stay, we have arranged special prices and conditions with Four Points By Sheraton Ljubljana Mons. The hotel is clean, with friendly staff and good breakfast included in the price. We have pre-booked rooms for you from 8 to 10 December (you can stay less days if you prefer). City tourist tax is 3.13 EUR per person per night and applies to all hotels.
Four Points By Sheraton Ljubljana Mons ****
- Website: https://www.fourpointsljubljanamons.si/
- Closest hotel to the venue at 22 minutes walking distance (2 km).
- Double room with breakfast: 117 EUR (per room per day)
- Single room with breakfast: 97 EUR (per room per day)
- Deadline for reservations: until fully booked
- Reservations link: https://www.marriott.com/event-reservations/reservation-link.mi?id=1694790328166&key=GRP&app=resvlink
- Price includes the use of hotel fitness, sauna and pool amenities. Free use of hotel parking.
Here are some more options:
B&B Hotel Ljubljana Park
- Website: https://www.hotel-bb.com/sl/hotel/ljubljana-park
- Located close to the city center at 1 hour's walking distance (4.5 km); taxi costs approximately 15 EUR one way.
- Prices from 104 EUR per room per night
Hotel Meksiko ***
- Website: https://www.hotel-meksiko.si/en/
- Located next to the hospital emergency at 1 hour's walking distance (4.5 km); taxi costs approximately 15 EUR one way.
- Single room: from 126 EUR per night (without breakfast)
- Double room: from 132 EUR per night (without breakfast)
Hotel Sport Ljubljana
- Website: https://www.sport-ljubljana.si/sport-hotel-ljubljana/
- Relatively close to the faculty at 25 minutes walking distance (2.2 km); taxi costs approximately 10 EUR one way.
- Prices from 83 EUR per night (no breakfast options available)
Of course, you can also arrange your own stay as you wish.
CERC 2023 sponsors:
CERC 2023 is the result of efforts of many people.
Regional contest director
- Andrej Brodnik
- Andrej Brodnik (chair)
- Nino Bašić
- Tomaž Hočevar
- Jure Slak
- Tomaž Hočevar (chair)
- Nino Bašić
- Janez Brank
- Vid Kocijan
- Maks Kolman
- Jure Slak
- Jan Berčič (chair)
- Gašper Fele Žorž
- Jure Slak
- Faculty of Computer and Information science, University of Ljubljana
- Association for Computer Machinery, Slovenia
- 2022: cerc2022.acm.si
- 2021: cerc2021.acm.si
- 2020: contest.felk.cvut.cz/20cerc
- 2019: contest.felk.cvut.cz/19cerc
- 2018: contest.felk.cvut.cz/18cerc
- 2017: cerc.hsin.hr
- 2016: cerc.hsin.hr/index.php?page=cerc2016
- 2015: cerc.hsin.hr/index.php?page=cerc2015
Please use the following email address for any questions about the contest:
Organization detailsACM Slovenija, Društvo za računalništvo in informatiko
Slovenska podružnica društva ACM
Jamova cesta 39