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Codeforces

Competitive programming contests and practice problems.

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Oct 29, 2026
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codeforces.com

Codeforces hosts regular competitive programming contests and has thousands of practice problems.

Why it is worth a bookmark

  • Compete in timed contests
  • Practise algorithms at your level
  • Earn a public rating
  • Learn from editorials after contests

Good to know

It's free. Start with Division 3 or 4 contests if you're new. Read the editorial and other people's solutions after each contest to learn new techniques, and build up gradually.