Just finished

Due to the COVID-19 pandemic, IOI 2020 was hosted by Singapore online. Visit the official website to learn more.

Just finished   IOI 2020 was held online

OII - Open Contest 2020

For the fifth time, the Italian national contest (valid for the selection of the Italian IOI team) will be mirrored into an online contest. The contest is primarily intended for high school contestants, but everyone is welcome to participate! The problem statements will be available in both English and Italian.

Tasks will be IOI-like (with graders) and you will have 5 hours to solve them.
The languages allowed are C and C++.

The time window for the practice contest (featuring original problems of the same level as the main contest) will start on 2020 November 22th, 00:01 CET and will end on 2020 November 24th, 23:59 CET.

The time window for the main contest will start on 2020 November 25th, 18:00 CET and will end on 2020 November 26th, 18:00 CET. The contest timing will be USACO-like: you can decide when to start your 5-hours time window (after the login), but the contest will end at the given time regardless of your time window.

If you want to participate, you must:

  • Visit the contest website: https://mirror.oii.olinfo.it
  • Click the link "register", fill out the form and then click on the register button and then "back to login"
  • You can now log in with the same username and password you used to sign up
  • If the login is successful you will be ready to participate, just wait for the contest to start! (And maybe save the page in your bookmarks, so that you can quickly get back to it when the contest begins)
  • When the contest starts, you will see a red button. Click it when you want to start your 5 hour time window!
  • Good luck and have fun!

Ranking and training

The ranking of the online contest will be available at https://mirror.oii.olinfo.it/ranking when the contest starts.

After the end of the contest, tasks will be uploaded in the Italian training website https://training.olinfo.it (localised also in English), section "task & quiz archive", where they will be available for online evaluation (after registering to the website).

We hope that you will join us or encourage your students to do so!

Giorgio Audrito and Edoardo Morassutto
(on behalf of the Italian Olympiad in Informatics organisers)

Need more info?


Not sure where to go? Click here to view some basic information on how to learn programming and prepare to win a medal at the IOI.


A couple of volunteers maintain a separate page with stats about people who participated at the International Olympiad in Informatics.


The IOI publishes a journal every year, with original high-quality scientific papers related to education, contests and algorithms.