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Contest news.
Clear context.
Updates, explainers and preparation notes for the USA Computing Olympiad — organized for students and families who want the important signal without the noise.
Latest dispatches
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2021 USACO Silver US Open Contest Problems
Official problem statements for this contest (PDF): Problem 1. Maze Tac Toe — PDF Problem 2. Do You Know Your ABCs_ — PDF Problem 3. Acowdemia — PDF New here? See how to practise with past contests, or browse the full official archive on usaco.org.
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2021 USACO Platinum US Open Contest Problems
Official problem statements for this contest (PDF): Problem 1. United Cows of Farmer John — PDF Problem 2. Routing Schemes — PDF Problem 3. Balanced Subsets — PDF New here? See how to practise with past contests, or browse the full official archive on usaco.org.
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2021 USACO Gold US Open Contest Problems
Official problem statements for this contest (PDF): Problem 1. United Cows of Farmer John — PDF Problem 2. Portals — PDF Problem 3. Permutation — PDF New here? See how to practise with past contests, or browse the full official archive on usaco.org.
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2021 USACO Bronze US Open Contest Problems
Official problem statements for this contest (PDF): Problem 1. Acowdemia I — PDF Problem 2. Acowdemia II — PDF Problem 3. Acowdemia III — PDF New here? See how to practise with past contests, or browse the full official archive on usaco.org.
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2021 USACO Silver January Contest Problems
Official problem statements for this contest (PDF): Problem 1. Dance Mooves — PDF Problem 2. No Time to Paint — PDF Problem 3. Spaced Out — PDF New here? See how to practise with past contests, or browse the full official archive on usaco.org.
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2021 USACO Platinum January Contest Problems
Official problem statements for this contest (PDF): Problem 1. Sum of Distances — PDF Problem 2. Minimum Cost Paths — PDF Problem 3. Paint by Letters — PDF New here? See how to practise with past contests, or browse the full official archive on usaco.org.
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2021 USACO Gold January Contest Problems
Official problem statements for this contest (PDF): Problem 1. Uddered but not Herd — PDF Problem 2. Telephone — PDF Problem 3. Dance Mooves — PDF New here? See how to practise with past contests, or browse the full official archive on usaco.org.
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2021 USACO Bronze January Contest Problems
Official problem statements for this contest (PDF): Problem 1. Uddered but not Herd — PDF Problem 2. Even More Odd Photos — PDF Problem 3. Just Stalling — PDF New here? See how to practise with past contests, or browse the full official archive on usaco.org.
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2021 USACO Silver February Contest Problems
Official problem statements for this contest (PDF): Problem 1. Comfortable Cows — PDF Problem 2. Year of the Cow — PDF Problem 3. Just Green Enough — PDF New here? See how to practise with past contests, or browse the full official archive on usaco.org.
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2021 USACO Platinum February Contest Problems
Official problem statements for this contest (PDF): Problem 1. No Time to Dry — PDF Problem 2. Minimizing Edges — PDF Problem 3. Counting Graphs — PDF New here? See how to practise with past contests, or browse the full official archive on usaco.org.