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AtCoder

Weekly algorithm contests from Japan, in English.

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Oct 29, 2026
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atcoder.jp

AtCoder hosts weekly algorithm contests from Japan, in English, with well-designed problems for all levels.

Why it is worth a bookmark

  • Compete in beginner contests
  • Practise clean algorithmic thinking
  • Track your rating
  • Study past problems

Good to know

It's free. The AtCoder Beginner Contests are a great entry point. Its problems are known for being clear and well tested, which makes it a good place to build solid fundamentals. Solutions from other contestants are available after each contest to learn from.