European Junior Olympiad in Informatics
Once a year, school students from across Europe spend a week solving algorithmic problems — and meeting people who find that as much fun as they do.
How to take part
If you are a student
Entry runs through your own country. Every country picks its team at its national olympiad, so the place to start is the organisation that runs yours — find it on the Member countries page.
You need to still be at school, at secondary level or below, and to be under 16 during the year the olympiad is held. Each country brings up to four contestants and two team leaders.
If your country is not on the list
EJOI invites Council of Europe members, any country that has taken part before, and any country the General Assembly approves. Either way, the country has to be in the Council of Europe or have territory in Europe.
Countries outside that can still come as guests. Guest contestants solve the same problems and get certificates saying which medal level they reached, but they do not appear in the official ranking.
Write to contact@ejoi.org and we will point you in the right direction.
Questions
What language are the tasks in?
Tasks are set in English. Delegation leaders may translate them into their own language.
How are medals decided?
Gold, silver and bronze go out in a ratio of roughly 1:2:3, and about half of all contestants come away with a medal.
Which programming languages can I use?
C++. It is the only language allowed at the contest.
What should I learn to prepare?
The Syllabus sets out what a task is allowed to be about, and is what hosts use when deciding whether a problem belongs at EJOI. It is just as useful the other way round, for working out what to teach a team.
Is it online or onsite?
Onsite. Contestants travel to the host country and compete there in person.
Three editions ran online — 2020, 2021 and 2022 — because of the circumstances of those years.
Where can I find past tasks and results?
Each edition links to its own site on the Editions page, where the host publishes that year’s tasks and final ranking. Results across all editions are collected on the statistics site.
You can also solve past contests yourself at eolymp.com.