Hello Codeforces!

We are excited to invite you to AlgoTrade 2026, a student-focused hackathon centered on algorithmic trading, taking place in Zagreb, Croatia this May.

What is it?

A 24-hour hackathon built around a custom simulated market environment. You and your team will design, optimize, and implement algorithmic trading bots under time constraints.

The hackathon is preceded by a few days of lectures from top industry quants and engineers to help you get up to speed with the domain.

Event Details

• Educational Phase: May 4–7, 2026
• Opening + Networking: May 8, 2026
• Hackathon: May 9–10 (24h)
• Location: Mozaik Event Center — Zagreb, Croatia
• Prize Pool: €10,000

The Sponsors

If you are looking to break into the quant industry, this is a massive networking opportunity. Our partners include:

Jane Street, IMC, Citadel, Susquehanna, Jump Trading, HRT, Wintermute, Da Vinci, and more.

Accommodation for Internationals

We are expecting around 300 students. 100 international participants will receive free accommodation during the event (selection is based on the strength of your application/background).

Note: Participants are expected to cover their own travel to Zagreb.

Who can apply?

Students (ages 18–26) with strong backgrounds in algorithms, computer science, mathematics, or data science.

You can apply as a team of 3–4, or individually (we will help match you with a team).

Apply

Apply here: https://algotrade.xfer.hr/
Deadline: April 1st

If you have any questions, feel free to ask in the comments below.

We hope to see many of you in Zagreb!

Hi everyone!

The final round of COCI will be held tomorrow, February 15th at 14:00 UTC. You can access the judging system here. If you are not familiar with the COCI contest format, we encourage you to read the announcement.

The round was prepared by dorijanlendvaj, ppavic, fbabic, cel.in, and me.

Feel free to discuss the problems in the comment section after the contest ends.

Hope to see you tomorrow!

Hi everyone!

The fourth round of COCI will be held tomorrow, January 25th at 14:00 UTC. You can access the judging system here. If you are not familiar with the COCI contest format, we encourage you to read the announcement.

The round was prepared by fbabic, vito1036, cel.in, psruk, and me.

Feel free to discuss the problems in the comment section after the contest ends.

Hope to see you tomorrow!

Hi everyone!

The third round of COCI will be held tomorrow, December 7th at 14:00 UTC. You can access the judging system here. If you are not familiar with the COCI contest format, we encourage you to read the announcement.

The round was prepared by keko37, cel.in, fbabic, vito1036, psruk, mkisic and me.

Feel free to discuss the problems in the comment section after the contest ends.

Hope to see you tomorrow!

Hi everyone!

The second round of COCI will be held tomorrow, November 9th at 18:00 UTC. You can access the judging system here. If you are not familiar with the COCI contest format, we encourage you to read the announcement.

The round was prepared by jklepec, cel.in, fbabic, vito1036, itiamhr, and me.

Feel free to discuss the problems in the comment section after the contest ends.

Hope to see you tomorrow!

Hi everyone!

The 19th season of COCI is starting soon! The first round will be held tomorrow, October 5th at 14:00 UTC. You can access the judging system here. If you are not familiar with the COCI contest format, we encourage you to read the announcement.

The round was prepared by jklepec, Agnus, cel.in, fbabic, mlicul and me.

Feel free to discuss the problems in the comment section after the contest ends.

Hope to see you tomorrow!