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USACO, the USA Computing Olympiad, is a well-known high-school computing competition in the United States, and it is the pathway through which the USA selects its team for the International Olympiad in Informatics (IOI). This guide explains what USACO is, how its four divisions work, and how to prepare at each level, whether you are…

USACO — the USA Computing Olympiad — is the contest used to select the United States team for the International Olympiad in Informatics (IOI). It is also a well-regarded route for middle and high school students worldwide who want to build a serious foundation in computer science. USACO runs four progressive divisions, from Bronze to…

USACO is one of the most widely recognized programming competitions for pre-college students, and its popularity has grown steadily. It is often on the radar of students who are interested in computer science and are aiming for competitive university programs. With a low barrier to entry and a clear, score-based division system, USACO gives students…

1. What Is USACO? USACO, the USA Computing Olympiad, is an online programming competition for pre-college students. Founded in 1992, it is one of the longer-running informatics contests in North America, and it is best known as the pathway that selects the United States team for the International Olympiad in Informatics (IOI). USACO is held…

Official problem statements for this contest (PDF): Problem 1. Left Out — PDF Problem 2. Cow Steeplechase II — PDF Problem 3. Fence Planning — PDF New here? See how to practise with past contests, or browse the full official archive on usaco.org.

Official problem statements for this contest (PDF): Problem 1. Tree Boxes — PDF Problem 2. Compound Escape — PDF Problem 3. Valleys — PDF New here? See how to practise with past contests, or browse the full official archive on usaco.org.

Official problem statements for this contest (PDF): Problem 1. Snakes — PDF Problem 2. I Would Walk 500 Miles — PDF Problem 3. Balancing Inversions — PDF New here? See how to practise with past contests, or browse the full official archive on usaco.org.

Official problem statements for this contest (PDF): Problem 1. Bucket Brigade — PDF Problem 2. Milk Factory — PDF Problem 3. Cow Evolution — PDF New here? See how to practise with past contests, or browse the full official archive on usaco.org.

Official problem statements for this contest (PDF): Problem 1. Grass Planting — PDF Problem 2. Icy Perimeter — PDF Problem 3. Mountain View — PDF New here? See how to practise with past contests, or browse the full official archive on usaco.org.

Official problem statements for this contest (PDF): Problem 1. Redistricting — PDF Problem 2. Exercise Route — PDF Problem 3. Train Tracking 2 — PDF New here? See how to practise with past contests, or browse the full official archive on usaco.org.