Competition
AtCoder Beginner Contest (ABC)
AtCoder Corporation
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Codeforces Competitive Programming Rounds
Run by Codeforces (ITMO University)
OnlineOnline (global), 2–3 hours per round; multiple rounds per week availableFreeOpenLow effort
About this opportunity
cs, competition, The world's most active competitive programming platform hosting Div. 1, Div. 2, Div. 3, Div. 4, Educational, and Global rounds weekly. Each round consists of 5–9 algorithmic problems solved within 2–3 hours. Codeforces rating (1559+) is used as a prerequisite for NUS CS3233 Competitive Programming.
Who can apply
Open to all ages globally; no minimum age; Singapore students can participate fully
Frequently asked
Who runs this?+
Run by Codeforces (ITMO University). More on their website.
Who can apply?+
Open to all ages globally; no minimum age; Singapore students can participate fully
Is it paid?+
Free to apply. No participant fees.
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View detailsUpdated 14 April 2026·Source