• YES
  • NO
  • ANSWERED IN TASK DESCRIPTION (EXPLICITLY OR IMPLICITLY): The task description contains sufficient information. The contestant should read it again carefully.
  • INVALID QUESTION: The question is not phrased so that a yes/no answer would be meaningful. The contestant is encouraged to rephrase the question.
  • NO COMMENT: The contestant is asking for information that the Scientific Committee cannot give.


In case the SC makes verbal announcements during the competition, these announcements will also be available on the Competition Server’s web interface. The web interface also shows the official CEOI time and date every time the page is loaded.

Conduct of Contest

Submitted programs are not allowed to:

  • use external libraries (e.g., crt, graph);
  • access the network;
  • fork;
  • open and create files;
  • attack the system security or the grader;
  • execute other programs;
  • change file system permissions;
  • read file system information;
  • make system calls not related to solving the competition task.

During the contest, contestants are not allowed to:

  • access the network for anything other than communicating with the competition server
  • communicate with persons other than CEOI staff
  • reveal their passwords
  • intentionally damage or endanger any part of the competition environment
  • use any printed materials and electronic devices brought by themselves with the exception of a keyboard

Any of the above actions may result in disqualification.

Appeal Process

At the end of each competition day, submitted solutions are judged using data which conforms to the specification given in the problem statement, but which is unknown to contestants during the competition.

Provisional grades, based on these tests, are delivered to team leaders. The test data will be available electronically in the contestant environments. Contestants and team leaders may use the contestant workstations to verify that the grading is correct.

A Team Leader may file an appeal by completing an Appeal Form and submitting the completed form to the SC until the GA meeting in the evening of the same day. Every appeal will be reviewed by the Scientific Committee and the team leader will be notified about the committee’s decision. All appeals and their disposition will be summarized at the final GA meeting of that competition day.

In the event that a mistake is discovered in the grading of a task, the mistake will be corrected and the submissions of all contestants will be re-graded and re-scored, whether or not the scoring of that particular submission has been appealed. Note that re-scoring may result in a higher or lower score for any contestant. Should anyone’s score change after grading results have been distributed, new results will be printed and distributed to them.

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