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  • First Round

    15 September – 30 November 2021

  • Workshops

    October – November 2021

  • End of the First Round

    30 November 2021

  • SOI Day

    January 2022

  • Training Camp in Sarnen

    February 2022

  • Second Round

    March 2022

  • Finals

    May 2022

  • EGOI in Turkey

    26 June – 2 July 2022

  • IOI in Indonesia

    7 – 14 August 2022

First Round

Solve the tasks of the first round on your computer at home!

Pick your favourite programming language and solve the tasks of the first round online.

Tasks for the contest 2022

The first round is conducted online. It starts on 15 September 2021 and ends on 30 November 2021. Everyone who satisfies the conditions of participations can participate. There are two categories: junior and regular. If you can participate this year and the following two more years, you are eligible for the junior round. The five tasks are chosen to promote creativity and good ideas – prior knowledge in programming and algorithms is useful, but not required.


Johannes' lecture about graphs

The graph lecture during the workshops.

Main page for the workshops

The workshops teach you everything you need to know to the tasks of the first round. You’ll learn about C++ and algorithmic problem solving. The workshops can be attended free of charge. No matter how much background knowledge you have, you will certainly benefit.

The dates at which these workshops will take place and whether they will be held online or on site in Lausanne, Bern, and Zurich will be announced soon.

End of the First Round

The winners of the first round of SOI 2019

The first round ends on November 30, but SOI just started: the 2H round opens which will prepare you for the next round and the camp.

We will correct the non-feedback tasks and invite the camp participants in early December. The official results are revealed during SOI day.


Creativity task tournament at SOI Day 2018

The SOI Day is an event in Zurich that will take place in January 2022, during which the results and awards of the first round will be published. Furthermore, the tourney to find the winner of the creativity task will take place at SOI day. Finally, there will be gripping speeches on topics of computer science.

Sarnen Camp

Group picture in 2018 in Ftan

The Sarnen camp is a week-long training camp for top 16 participants from the regular round, the top 8 participants of the junior round and some guest countries. There are lectures, practice tasks and training contests, but there is also ample time to meet the other participants and have lots of fun.

Second Round

Participants working on round 2T in 2017

Students working on the theoretical part of the second round

A total of 60 participants (20 junior, 40 regular) of the first round qualify for the second round. Participation in the SOI-Camp is not mandatory for participation in the second round.

The second round consists of three parts:

  • 2T (400pts, theoretical, March 2022): 5h pen-and-paper exam at ETH Zürich or EPF Lausanne
  • 2P (400pts, practical, March 2022): online exam written from home during a 5h time-slot of your choice
  • 2H (200pts, homework): solve some full-feedback training tasks starting from December 1st


Gold medallists at the finals in 2019

The winners of the finals in 2019

The top 10 participants of the second round together with two selected by us are invited to the final round in Bern and Zürich. During the final round there are four practical programming contests that are held on two weekends in Bern and Zürich. In the finals and at IOI, you will not be allowed to use any language other than C++ or Python to solve the tasks.


The EGOI, the European Girls’ Olympiad in Informatics, is a competition where countries from all over Europe send their best female participants. The first edition was held in 2021 in Zurich. The best four female participants at the second round of this year’s Swiss Olympiad in Informatics will make up the Swiss team at EGOI.


Swiss team at IOI 2019 after the medal ceremony

Two bronze medals for Switzerland at IOI 2019 in Baku

Over 80 nations send their 4 best students to compete in the International Olympiad in Informatics (IOI). The IOI is the most important, but not the only international event where the best participants of the SOI can meet, exchange and compete with other teenagers.

See full agenda for a list of all dates.

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