February 2023 Contest

The USACO February 2023 Contest has recently ended. Results are availabile here.

2022-2023 Schedule Announced

The USACO is pleased to announce its contest schedule (on the right of this page) for the 2022-2023 season. As in the past, we will be holding four on-line contests, followed by an invitational training camp, from which teams representing the USA at the 2023 International Olympiad in Informatics and European Girls Olympiad in Informatics will be selected.

Strong Results at 2022 IOI and EGOI

Congratulations to Benjamin Chen (gold), Rain Jiang (silver), Timothy Feng (gold), and Hankai (Sam) Zhang (gold) for their strong results representing the USA at the 2022 International Olympiad in Informatics in Indonesia! Congratulations to Claire Zhang (gold), Luoluo (Christina) Li (silver), Vivian Han (silver), and Katherine Li (silver), for their strong results representing the USA at the 2022 European Girls Olympiad in Informatics in Turkey!

2021-2022 Finalists Announced

The USACO is pleased to announce its finalists for the 2021-2022 season, all invited to participate in our training camp in late May / early June to compete for selection for the USA teams attending the International Olympiad in Informatics and the European Girls Olympiad in Informatics.

Gmail Delivery Issues

We have been made aware that gmail has recently stopped accepting some emails from the USACO server -- e.g., for new accounts and password resets. If this issue is affecting you, please try adding usaco@usaco.org to your gmail contacts list. If you are still having issues, please notify the contest director, Brian Dean (bcdean@clemson.edu). If you have recently received an email from the USACO server such as a password reset email or an account creation email, consider starring it, so that gmail will hopefully treat USACO emails with better priority.

Impressive Results at IOI 2021!

Congratulations to Timothy Feng (gold medal), Siyong Huang (gold medal), Rain Jiang (gold medal), and Richard Qi (silver medal), who represented the USA at the 2021 International Olympiad in Informatics (IOI), hosted by Singapore.

Impressive Results at EGOI 2021!

Congratulations to Rayna Arora (silver medal), Tarushii Goel (silver medal), Vivian Han (bronze medal), and Claire Zhang (gold medal), who represented the USA at the 2021 European Girls Olympiad in Informatics (EGOI), hosted by Switzerland.

IOI 2020: 1st Place for Third Year in a Row!

Congratulations to Walden Yan (gold medal), Danny Mittal (silver medal), Xinyang (Alan) Chen (gold medal), and William Lin (gold medal, 1st place individual winner), who represented the USA at the 2020 International Olympiad in Informatics. This is the 3rd year in a row where the USA team has fielded the 1st place individual winner at the IOI.

Our Mission

The USACO supports computing education in the USA and worldwide by identifying, motivating, and training high-school computing students at all levels. We provide:

• Hundreds of hours of free on-line training resources that students can use to improve their programming and computational problem-solving skills.
• On-line programming contests (roughly six per year) for students at all levels.
• An intensive summer training camp, to which the top students in the USA are invited to further improve their skills and learn advanced material.
• The opportunity for the top four students in the USA to represent their country at the International Olympiad in Informatics (IOI), the most prestigious international algorithmic programming competition at the high-school level.

First Place at IOI 2019!

Congratulations to the USA team attending the 2019 IOI in Baku, Azerbaijan. From left to right: Eric Zhang (gold), Benjamin Qi (gold, 1st place individual winner), Daniel Zhang (gold), and and William Lin (silver).

First Place at IOI 2018!

Congratulations to the USA IOI team for a superb showing at the 2018 International Olympiad in Informatics in Tsukuba, Japan! From left to right: Spencer Compton (gold), Eric Zhang (gold), Benjamin Qi (gold, 1st place individual winner), and William Hu (bronze).

Training Pages Now Support Python

For those who prefer coding in Python, our training pages now support submission of programs written in Python 2.7 or Python 3.6.

Your Account

2022-2023 Schedule

Dec 16-19: First Contest
Jan 27-30: Second Contest
Feb 24-27: Third Contest
Mar 24-27: US Open
May 25-June 3: Training Camp
Jul 15-21: EGOI 2023 (Sweden)
Aug 28-Sep 4: IOI 2023 (Hungary)