Main contest info

STATEMENTS

information

• Date/Time: Sat 1/17 — late entry or early exit during the contest is not possible

  • 12:00-12:30 Venue entry (entry may not be allowed after 12:50)

  • 12:30-13:00 Contest guidelines / important notices

  • 13:00-17:00 Contest (may start and end about 10 minutes late; no mid-contest entry or early departure)

  • 17:00-17:30 Break

  • 17:30-18:30 Special-prize related recreation + sponsor promotion session

  • 18:30-20:00 Solution walkthrough, scoreboard announcement, and awards ceremony

• Location: Korea University (Anam), Aegineung Student Center 301 & 302 (please come to Room 301)

• If you are caught cheating, you will be removed from the venue without warning.

  • In case of cheating, you will receive a score of 0 regardless of the reason, and you will be excluded from both the main contest and the open contest rankings.

  • You will also not receive the background/badge if you cheat.

• We have been informed by Korea University that the venue heating may not be available on Saturday.

  • Please make sure to dress warmly.

  • We recommend bringing items such as hot packs, hot water or warm tea, a battery that generates good heat, an incandescent light bulb, etc., in advance.

contest environment

• The contest will be conducted via Baekjoon Online Judge. 🔗

  • Your ID and password will be provided at the venue.

• You must bring your own laptop.

  • You may bring up to one each of the following: laptop, keyboard, mouse, and monitor, and they must not be too loud.

• For internet access, you must use one of the following:

  • Personal internet (recommended)

  • Korea University Wi-Fi (KU students only; authentication required)

  • eduroam (please look up how to use it on your own)

  • If all three options are difficult for you, please contact 010-4831-3499 by Thu 1/15 at 23:00.

• Power outlets will be available at the venue, so please bring your laptop charger.

  • If you are unable to prepare the required items due to unavoidable circumstances, please contact 010-4831-3499 by Thu 1/15 at 23:00.

Problem types

• Problem statements will be printed in either Korean or English, based on the language you selected when registering.

  • On the BOJ site and in the PDF uploaded there, you can view the statements in both languages.

  • If there is any discrepancy between versions, please treat the BOJ site version as the top priority.

  • If you need the other language (Korean/English) for the printed statements, please contact 010-4831-3499 by Thu 1/15 at 23:00.

• The main contest has 10 problems per division.

  • Division 2 (easier difficulty)

    • The problems are arranged in what the organizers believe is difficulty order.

    • However, there were significant disagreements even within the staff, and compared to past KCPC and MatKor Cup contests, the difficulty-vote spread for each problem was very large—please keep this in mind when solving.

      • But it was all agreed on by the staff that Problem A is the easiest.

  • Division 1 (harder difficulty)

    • The problem order is not related to difficulty.

      • But it was all agreed on by the staff that Problem A is the easiest.

awards

• Ranking Prizes (18 total)

  • Division 1

    • Overall (all participants)

      • Grand Prize (1 person): Not disclosed

      • Top Excellence Award (2 people): Not disclosed

      • Excellence Award (3 people): Not disclosed

    • Korea University internal participants

      • Grand Prize (1 person): Not disclosed

      • Top Excellence Award (2 people): Not disclosed

      • Excellence Award (3 people): Not disclosed

    • If eligibility conditions overlap, the higher prize takes priority. For any other overlapping prizes, we will discuss and decide at that time.

  • Division 2

    • Grand Prize (1 person): Not disclosed

    • Top Excellence Award (2 people): Not disclosed

    • Excellence Award (3 people): Not disclosed

  • In each division, higher-tier prizes include all lower-tier prizes.

• Special Prizes (40 or more)

  • Some prizes can overlap with ranking prizes and other special prizes; some cannot.

    • Details: Not disclosed

• Participant Souvenirs (for everyone who participates)

• Some prizes may be bulky if you win. We plan to provide an eco-bag, but please use your own judgment and bring an additional bag if needed.

contest guidelines

• This is an offline contest.

• During the contest, you may only refer to the contest site and the items listed below.

  • Reference Notes (Teamnote)

    • You may bring a printed reference document of up to 25 single-sided A4 pages. You must print it yourself and bring it with you.

    • It must be single-sided.

    • If the printed text is too small (< 2 mm, about 6 pt), it may be rejected.

    • The reference document will be checked during registration; if rejected, you may not bring it in.

    • Every page of the reference document must have the nickname used on the scoreboard and the page number printed on it, or it must match one of the following example formats:

      • Example 1

      • Example 2

      • Example 3

  • Contest information site 🔗

  • BOJ Help 🔗

  • Allowed reference sites by language:

    • C/C++ 🔗

    • Java 🔗

    • Kotlin🔗

    • Python🔗

    • Rust🔗

    • Other languages are not allowed as references.

  • Code formatters are allowed only if they do not change code content and only adjust whitespace, etc.

  • Autocomplete / code completion is allowed only when it relates to content found in official reference documents.

    • Examples: VS Code extension IntelliSense, Sublime Text Completions are allowed.

    • Tools that use existing code, such as Copilot, are not allowed.

  • Other tools not directly related to writing code (e.g., compiling via hotkeys, input piping pipelines, simple code comparisons like Unix diff) are allowed.

    • Examples: VS Code extension Code Runner, Competitive Programming Helper are allowed.

  • During the contest, you may not consult anything other than the allowed items, including (but not limited to) the following:

    • You may not use devices such as a tablet in addition to one laptop.

      • However, using a tablet instead of a laptop, or using a tablet only as an external monitor, is allowed. If the boundary is unclear, please ask.

    • You may not refer to any documents other than the approved reference notes.

    • You may not refer to your own pre-written code.

    • You may not refer to public code on the internet.

    • You may not use internet resources at all, including web searching.

    • All AI-related activities are strictly prohibited.

      • AI tools such as ChatGPT, Gemini, Copilot, Cursor, JetBrain AI Assistant, etc., are absolutely prohibited; if any form of usage is detected, it will be treated as cheating.

    • Online IDEs such as Colab and IDEOne are also prohibited.

    • During the contest, you must not communicate with anyone other than staff—including other participants, outsiders, ChatGPT, chess, Tetris, “SimSimi,” or anyone else.

    • Pre-written libraries for algorithmic problem solving, such as the AtCoder Library, are not allowed. This applies not only to submitted code, but also to any code written for testing.

    • Tools that generate code using simple grammars such as Lex & Yacc, cLay, etc., are not allowed.

• You will be provided with one black ballpoint pen and single-sided printed problem sheets. You may bring your own stationery (pens, protractor, compass, ruler, etc.).

  • You may not bring scratch paper/notebooks/grid paper, etc. Please use the back side of the provided problem sheets.

• Light refreshments will be available at the venue. You may take and eat them before, during, or after the contest.

  • However, the drinks are prepared with 1 can of monsters and 1 bottle of water per person, so please bring them separately if you need additional drinks.

• During the contest, announcements will be posted in the Announcements section; major announcements will be made separately.

• The scoreboard will be frozen 60 minutes before the contest ends.

• Late entry and early exit are not allowed during the contest.

• If you need to use the restroom, exit to the entrance area and follow staff instructions; one man and one woman may go in turn.

  • For identification, staff may check your name and badge before you go to the restroom.

  • Since contestants may only go one at a time, do not go to the restroom without staff guidance, and inform staff again after returning.

• If you leave after the contest ends but before all scheduled events are finished, you will be excluded from the award list. Please notify the staff to ensure an accurate headcount.

• For contest-related questions during the contest, use the contest site’s Questions tab.

  • Raise your hand only for technical issues. (Environment/internet issues are intended to be tested during the preliminary contest, and there is no guarantee they can be resolved on-site.)

• If cheating occurs, you will be removed without warning.

  • In case of cheating, you will receive a score of 0 regardless of the reason, and you will be excluded from the main contest and open contest rankings.

  • You will also not receive a background/badge if you cheat.

• For problems without special labels such as “Special Judge” or “Interactive,” your output must match the correct answer exactly. For example, if the answer is "3", then "3.0" is wrong.

• During the contest, questions must be asked via the Questions tab on the contest site.

  • Answers will be one of: “Yes,” “No,” “Cannot answer,” “The problem statement contains the answer to the question,” or another response appropriate to the situation.

  • If your question is unclear, the response will be “Please clarify the question.”

  • Please do not ask “Yes/No” questions using negatives (e.g., “Isn’t n = 3?”).

  • Questions that all contestants should know may be made public.

• We have done our best to avoid errors in problem setting/operations/review, but even if an error is found during or after the contest, the results (including awards) will not change as a rule.

Scoring

• The contest uses a points-based system. Rankings are determined in the following priority order: the person who solves the most problems, the person with a smaller time penalty, the person whose last full-score submission is earlier, and the person whose last submission is earlier.

• For each problem, a 20-minute time penalty is applied per submission made before the first submission that achieves the highest score for that problem.

• The contest follows the standard Baekjoon Online Judge scoreboard rules, and even if any of the above description contains mistakes, the rankings will not be changed.