Dear Codeforces community,

The Asia-Pacific Informatics Olympiad (APIO) 2021 is going to take place this month.

We invite everyone to participate in the APIO 2021 Open Contest. The open contest will have the same problemset as APIO 2021 and will be held using CMS. 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, and you can participate at any time within that window.

More details are available on https://apio2021.id/open.html. You can register and access the contest on https://open.apio2021.toki.id/.

We wish everyone to enjoy the open contest!

Thanks,
APIO 2021 Scientific Committee

UPD: The practice session is just over. The problems used are coming from Indonesia's past contests:

• Problem cards: https://tlx.toki.id/problems/tsoc-cms/B
• Problem defence: https://tlx.toki.id/problems/ksn-2020/1A
• Problem hoax: https://tlx.toki.id/problems/osn-2019/2C

You may upsolve the problems there. Some of them have editorials that can be found from the left side of the page.

Feel free to join our virtual opening ceremony on Youtube today, and do not forget to register for the open contest!