APIO 2021 Open Contest

We invite everybody to participate in APIO 2021 Open Contest. The open contest will have the same problemset as APIO 2021. Therefore, we encourage people who have seen the problemset before the open contest to not participate in the open contest.

Technical Details

The Open Contest will be held on CMS which is also used for the official contest. You can register and participate for the open contest at https://open.apio2021.toki.id/.


The open contest will be held between Monday, 24 May 2021 (05:00 UTC+0) and Wednesday, 26 May 2021 (05:00 UTC+0). The duration of the contest is 5 hours. You can participate at any time within that window. Once the “Start!” button in the contest is pressed, your uninterrupted 5-hour time frame will be started. The result of the open contest will be available on this website after the closing ceremony.


The rules of APIO 2021 Open Contest follow the rules of APIO 2021, except:

  • There will be no practice problemset.
  • A contestant cannot submit a clarification request.