The Nordic Olympiad in Informatics 2025

The Nordic Olympiad in Informatics (NOI) is a programming competition for high school students in almost the same format as the Baltic Olympiad in Informatics and the International Olympiad in Informatics. Students from the four Nordic countries, Sweden, Iceland, Finland, and Denmark participate in the competition.

Practical information

NOI 2025 will take place Wednesday, March 5, 2025, from 13.00 to 18.00 (CET). The competition is available online, but participating countries may have on-site events for their participants. NOI 2025 is hosted by Denmark, please contact us on info@danskdatalogidyst.dk, in case of questions.

Clarifications

• What is the maximum allowed submission size? 100KB
• Am I allowed to look at code i have written before? No, we try to follow the rules of BOI/IOI which means you should start writing your code from scratch, and that you cannot look on your old code in general.

Rules

The following rules apply to the competition. Rules are subject to change until the day of the competition.

• The competition lasts 5 hours and consists of 3 problems.
• All tasks must be solved individually.
• It is NOT allowed to search for information in books or on the internet, use any kind of generative AI, or to communicate with others during the competition (obviously, you are still allowed to send clarification requests to us).
• You are allowed to use the internet version of the official programming language reference for your programming language.
• Solutions can be submitted in at least C/C++ or Python 3.10 (pypy) (there is no guarantee that all problems can be solved in all languages, however, we do our best to ensure that this is the case).
• Problems are divided into subtasks and solving an entire subtask will give a specific number of points.
• The number of points awarded for a task will be the for each subtask the maximum points achieved over all submissions (IOI style)
• Participants are ranked based on the total number of points obtained.
• Virtual gold, silver, bronze will be rewarded as usual.
• Results will not be published until shortly after the competition ends (i.e. there will be no public live scoreboard as at the BOI/IOI).
• You can submit solutions after the end of the contest; however, these will not count in your official score.