Codeforces Contests is a free calendar you can subscribe to on Nundina, with 12 dates listed. Data from Codeforces. Subscribe to it on Nundina and every date lands in your own calendar, updated automatically.
Upcoming Codeforces competitive-programming rounds (Div. 1/2/3, Educational, sponsor and ICPC-style contests) with start time and duration, for contestants and interview-prep students.
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