Codeforces (competitive programming)
The global home of competitive programming — free rounds several times a week, a rating you can grow.
- Computer Science
- Who can enter
- Anyone worldwide — free; rounds open to all
- What it costs
- Free — contests, editorials and the whole archive cost nothing.
- When it closes
- We could not confirm this year's date against the organiser's own page, so we are not showing a countdown for it. Last published: Rated rounds several times a week — no registration deadline.
Sending this to someone sends the four facts above, not just a name — they will see who can enter and what it costs before they decide.