Massachusetts Computer Science Olympiad

The Massachusetts Computer Science Olympiad is a high-school programming competition hosted by the leaders of Brookline Computer Science Initiative. Our goal is to provide Massachusetts CS students with hands-on experience and opportunities to build a network of fellow coders through an in-person coding competition.

// highlights

MACSO '24

Check out some highlights from our last competition!

// results · macso '24

Final Standings

In-Person HS Finals

Award	Full Name	School
1	Mark Zhou	George School, PA
2	Artur Gilfanov	Fairview High School, CO
3	Yancheng Zhao	Buckingham Browne & Nichols School, MA
HM	Zachary Rogers	Brookline High School, MA
HM	Leran Tao	Newton North High School, MA
HM	Milo Chourmet	Roxbury Latin School, MA
HM	Austin Liu	Belmont High School, MA

Online Open Finals

Award	Full Name	School
1	Jaehyun Koo	Massachusetts Institute of Technology, MA
2	Julian Wu	Westview High School, CA
3	Yu Zheyuan	NUS High School of Math and Science, Singapore

// faq

FAQ

Contact [email protected] for any questions.

Who can participate in the competition?

The competition is open to high school students of all programming backgrounds. Whether you are a beginner or an advanced coder, you are welcome to participate! After you get your Codeforces username verified, you can start the competition.

How does the competition work?

The competition has two parts: an online qualification stage (Summer 2025) and in-person finals (separate online finals for those who can't make it). The qualification stage consists of three coding problems with no time limit (tie breakers decided from amount of time used), and the top 50 qualify for the finals.

What is the scoring system like?

Qualification: IOI system. Each problem is graded either by groups or by each test individually. Finals: ICPC system. Each problem is either solved or not. The time penalty serves as tie breaker.

When and where is the competition?

The competition will be held at the Brookline Teen Center Summer 2025. The in-person competition lasts three hours and includes free pizza, prizes (Amazon giftcards), and activities.

How can I register for the competition?

You can register by clicking the Registration Form button at the top of the page, or directly through the registration form where you can fill in your details.

Can I participate if I’m not in Massachusetts?

Yes, online participants who can’t make it in person can qualify for the online finals!

// people

Meet the Team

We are a group of students at Brookline High School passionate about computer science. Our goal is to give aspiring programmers in Massachusetts an experience beyond the school curriculum.

Sergey Zatsepin

Director, Problem Author

Ethan Chen

Head of Fundraising

Dana

Problem Writer Assistant

Founders

Mikhail Zhernevskii

Cofounder, Ex-Director, Ex-Problem Author

Lucas Chen

Cofounder, Website Designer, Ex-Fund Manager

Tyler Sacharow

Cofounder, Ex-Advertiser, Ex-Problem Author

Judge

Shruti Dhumak

Judge, Senior Engineer at Google

Shruti is a Sr. Customer Engineer at Google working with their Cloud practice at the Cambridge office. She has extensive experience in technology and was a Sr. Systems Engineer at Juniper Networks before joining Google. Shruti graduated from University of Massachusetts, Amherst with a Masters in Computer Engineering in 2016. She has been actively contributing to students in STEM over more than 6 years.

// sponsors