The CALICO Informatics Competition is a high-school programming competition hosted by students at UC Berkeley. We create contest problems to promote the understanding of useful algorithms and encourage students to grow their problem-solving skills! To see some past problems, check out our Problem Bank.

What Do We Do?


Our biannual programming competition is for students up to 12th grade. These contests are run during the fall and spring season, and consist of a large number of problems meant to be solved by teams. Come prepared to bring your best, and we will take care of the rest!


Our CALSUCO summer contests are open to participants of all ages! Compete as an individual; these contests consist of multiple online, bite-sized rounds run during the summer months. Keep your skills fresh with these lower-stakes, casual contests!

Editor's Choice

These problems almost made the cut for our competitions--so close! These contests are released on our problem bank before CALICO competitions; no registration necessary! Same format, same rules--feel free to use these as practice material, tryouts for teams, or to test your computer setup!

Congratulations to our winning teams
of CALICO Fall '22!

Red and Black Benches 87 points
PurpleCrayon | penguinhacker | GusterBuster
CCA Team 1 from Canyon Crest Academy, CA 87 points
Shreyas Thumathy | Ryan Bai | Evan Luo
OlyFans 83 points
Eric Yang | Alex Fan | Austin Geng
o geng 83 points
Ritwin Narra | Ian Zhang | Ethan Lee
bald lolz 77 points
nononoyesyes123321 | Ench Lolz | Kaicheng

...and congratulations to our top college team!

Geisel Library from University of California, San Diego 83 points
Thomas Li | Stanisław Strzelecki | Huize Mao


11/26: CALICO Fall '22 winners have been RELEASED! Congratulations to all our winning teams! Raffle and bounty winners will be announced later this week, and write-ups + full contest material will be released in the coming weeks. Thank you for competing in our contest, and see you next time!

CALICO Fall '22 Online

Date Time (PT) Event
10/1/2022 12:00PM Registrations Open!
11/24/2022 11:59PM Registrations Close
11/25/2022 8:00PM Confirmation Emails Sent
11/26/2022 4:00PM Contest Begins!
7:00PM Contest Ends
11/28/2022 7:30AM Winners Announced!

Contest Schedule

Date Contest Registration Deadline
7/30/2022 CALSUCO '22 7/27/2022 11:59PM PT
N/A Editor's Choice Fall '22 Cancelled :'((
11/26/2022 CALICO Fall '22 Online 11/24/2022 11:59PM PT

Want to be the first to know when registrations open? Sign up for our email list to get updates sent right to your inbox!


CALICO is open to everyone! However, only teams of pre-college students are eligible to win prizes.

We define "pre-college student" as anyone up to 12th-grade in the US or the equivalent grade/age for international/homeschooled/early graduation students.

Once you've registered, you can expect an email from us after the registration deadline about how to access the contest site. For more information on this, see "Contest Autograder Logistics" under our Contest Guide.

In the meantime, check out our "Preparing for the Contest" checklist, also found on our Contest Guide!

If you know how to work with conditions, loops, strings, and integers, you can start solving problems! At a higher level, our problems give students a preview into concepts taught at various classes within Berkeley's CS department. Regardless of whether you're just starting out or a seasoned programmer, there will be something for you!

All you need is a computer running an approved programming language, a text editor to work with, and a stable internet connection! For a list of approved programming languages, see "Approved Languages" under our Contest Guide.

A maximum of 3 people are allowed to be on a team for CALICO. You're free to have smaller teams, but it's more fun with friends!

The following prizes will be awarded to the winning teams (1 per team):

  • 1st Place: $200 Amazon Gift Card + $100 X-Camp Discount Code + $250 DigitalOcean Credits
  • 2nd Place: $100 Amazon Gift Card + $85 X-Camp Discount Code + $250 DigitalOcean Credits
  • 3rd Place: $50 Amazon Gift Card + $70 X-Camp Discount Code + $125 DigitalOcean Credits
  • 4th & 5th Place: $25 Amazon Gift Card + $50 X-Camp Discount Code + $100 DigitalOcean Credits

All X-Camp discount codes are per student on the winning team!

We will also be raffling off the following prizes to individual contestants:

  • 4x $30 X-Camp Session Discount Code for New Students
  • 4x $100 DigitalOcean Credits
  • 2x 1 Month Discord Nitro Subscription
  • 2x $11 RP Gift Card (1380 Riot Points)
  • 2x $10 Steam Gift Card
  • 2x $10 Apple/Google Play Gift Card
  • 2x Instagram Mug Swag Bundle*
  • 2x Meta Shirt Swag Bundle*
  • 1x Microsoft Black Bottle + Xbox Controller Pin*
  • 1x Microsoft White Tumbler + Xbox Pin*
  • 1x Brick*

More information on how the raffle will be run and how you can participate can be found under "Raffle Logistics" on our Contest Guide!

All prizes will be distributed to the winning teams following the contest.

*Available for shipping to US/Canada only

Check out our Contest Guide to learn about the rules, the structure of the contest, and other technical details!

If you have a question, don't hesitate to email us at team@calico.berkeley.edu! Feel free to also reach out to us on Discord.

Join Our Email List!

Stay in the loop for CALICO announcements by signing up for email notifications! Our email list will only notify you when contest registrations open, along with other important updates.

Visit Our Problem Bank!

Past contest problems, along with their full test cases and solutions, can be accessed here! We highly encourage you take a look. Practice problems will also be published here occasionally, so check back here every once in a while!


Thank you to these organizations for making our events possible! Interested in supporting CALICO? Shoot us an email at team@calico.berkeley.edu!


Check out some of our peer organizations!