Competition
AtCoder Beginner Contest (ABC)
AtCoder Corporation
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USA Computing Olympiad (USACO)
Run by USACO (usaco.org)
OnlineOnline (global), 4–5 hours per contest window; 3 online contests per seasonFreeOpenLow effort
About this opportunity
cs, competition, Four-level online competitive programming contest — Bronze, Silver, Gold, and Platinum — held across three online rounds per season and a proctored US Open championship. Open to all pre-college students worldwide, with non-US participants competing in a separate observer ranking. Widely used by Singaporean students as NOI preparation.
Who can apply
Any pre-college student worldwide; Singapore students participate as observers (not eligible for US IOI team selection)
Frequently asked
Who runs this?+
Run by USACO (usaco.org). More on their website.
Who can apply?+
Any pre-college student worldwide; Singapore students participate as observers (not eligible for US IOI team selection)
Is it paid?+
Free to apply. No participant fees.
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View detailsUpdated 14 April 2026·Source