Codeforces is one of our favorite platforms for contests and training, but it still has some annoying bugs. I recently discovered one of them. Since I couldn’t find an official bug report system (why doesn’t it exist?), I decided to write about it here.

When you try to register for a virtual contest as a team, the system does not allow registration if the team has four or more members and this is the expected behavior.

However, there is a way to bypass this unintentionally. For that, first register virtual participation with 3 or less team members. Then change the contest start time through the right sidebar — simply click on the time of contest in the "Recent virt. contests" sidebar and adjust it. Like here:

Now, for some reason, you will start your participation with the entire team.

This has happened several times to us and it is frustruating (definitely not because I can't see my handle). Please, fix it.

Hi Codeforces, the member of the APIO 2025 organising committee is with you.

Our team is thrilled to announce that the participation window (17 May 02:00:00 UTC — 18 May 14:00:00 UTC) has closed and all submissions have been successfully judged. You are now welcome to discuss the tasks and your results!

Here is the ranking: apio2025.github.io/apio2025_ranking

ATTENTION: This table lists all participants, including unofficial ones. The official results will be published in a few days.

We also congratulate strapple on achieving the highest score in APIO 2025!

Also here you can find the GitHub repository with tasks details and test data: https://github.com/apio2025/apio2025_tasks

UPD 1: Ranking archived.

UPD 2: You can watch awards ceremony on youtube

If you study in school and believe you can win a medal in the IMO, IOI, IChO, or IPhO, you should consider moving to Uzbekistan. Starting this year, the monetary rewards for medal winners have increased five times. Now, you will receive approximately:

• $29,000 for a bronze medal
• $43,500 for a silver medal
• $72,500 for a gold medal

Note that: You must study in Uzbekistan to be eligible for the prize. If you win a medal in different editions of the same olympiad or multiple olympiads in one year, you will be rewarded for each medal. The amount is not fixed, increases with inflation, and is tax-free. Also, it is probably easier to pass all selection stages and qualify for an olympiad here rather than in your country.

It is not clickbait—consider moving to Uzbekistan. Other reasons: easy to relocate, Uzbekistan is visa-free for many countries (just look at the welcoming index); a safe country; low cost of living; delicious food; and many other benefits.

Nowadays I am looking for online camps. I know there are camps like Petrozavodsk camp or OCPC camp which are held annually. But I want to create list of camps for this year. Please tell about upcoming online/offline camps if you know any. Personally, I am looking camps for uni students, but you are free to tell about IOI camps too.