Massachusetts Computer Science Olympiad
MACSO Summer '26 Summer 2026
p.s. — we're hiring! join the MACSO leadership team →
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.
MACSO '24
Check out some highlights from our last competition!
Final Standings
In-Person HS Finals
| Award | Full Name | School |
|---|---|---|
| 1st | Mark Zhou | George School, PA |
| 2nd | Artur Gilfanov | Fairview High School, CO |
| 3rd | 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 |
|---|---|---|
| 1st | Jaehyun Koo | Massachusetts Institute of Technology, MA |
| 2nd | Julian Wu | Westview High School, CA |
| 3rd | Yu Zheyuan | NUS High School of Math and Science, Singapore |
Questions we get a lot
Contact team@macso.org 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 2026) 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 2026. 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!
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.
@bhs.computerscience
Sergey Zatsepin
director, problem author
Ethan Chen
head of fundraising
Dana
problem writer assistant
the 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
the judge
Shruti Dhumak
judge, senior engineer at google
read her bio ↓
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.
Our Sponsors
A huge thanks to our sponsors. Without their support, MACSO wouldn't be possible.
Partner Competitions
Here are our partner competitions. We strongly recommend trying their competitions as well!
Want to practice?
To learn the algorithms and data structures for MACSO, you can use websites like USACO Guide or Algorithms for Competitive Programming.
Where to Find Us
Brookline Teen Center — 40 Aspinwall Ave, Brookline, MA