USACO Past Problems & Official Solutions
2025–2026 Season
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Third Monthly Contest 2026 Results
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February 2026 Contest Results
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January 2026 Contest Results
2024–2025 Season
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US Open 2025 Results
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February 2025 Contest Results
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January 2025 Contest Results
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December 2024 Contest Results
2023–2024 Season
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US Open 2024 Results
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February 2024 Contest Results
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January 2024 Contest Results
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December 2023 Contest Results
2022–2023 Season
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US Open 2023 Results
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February 2023 Contest Results
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January 2023 Contest Results
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December 2022 Contest Results
2021–2022 Season
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US Open 2022 Results
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February 2022 Contest Results
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January 2022 Contest Results
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December 2021 Contest Results
2020–2021 Season
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US Open 2021 Results
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February 2021 Contest Results
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January 2021 Contest Results
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December 2020 Contest Results
2019–2020 Season
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US Open 2020 Results
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February 2020 Contest Results
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January 2020 Contest Results
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December 2019 Contest Results
2018–2019 Season
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US Open 2019 Results
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February 2019 Contest Results
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January 2019 Contest Results
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December 2018 Contest Results
2017–2018 Season
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US Open 2018 Results
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February 2018 Contest Results
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January 2018 Contest Results
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December 2017 Contest Results
2016–2017 Season
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US Open 2017 Results
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Third Academic Contest (February 2017) Results
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Second Contest (January 2017) Results
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First Contest (December 2016) Results
2015–2016 Season
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US Open 2016 Results
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Third Academic Contest (February 2016) Results
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Second Contest (January 2016) Results
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First Contest (December 2015) Results
2014–2015 Season
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US Open 2015 Results
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Third Academic Contest (February 2015) Results
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Second Contest (January 2015) Results
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First Contest (December 2014) Results
2013–2014 Season
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US Open 2014 Results
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March 2014 Academic Contest Results
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February 2014 Contest Results
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January 2014 Academic Contest Results
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December 2013 Contest Results
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November 2013 Contest Results
2012–2013 Season
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US Open 2013 Results
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March 2013 Academic Contest Results
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February 2013 Contest Results
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January 2013 Academic Contest Results
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December 2012 Academic Contest Results
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November 2012 Contest Results
2011–2012 Season
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US Open 2012 Results
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March 2012 Academic Contest Results
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February 2012 Contest Results
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January 2012 Academic Contest Results
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December 2011 Academic Contest Results
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November 2011 Contest Results
