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AtCoder

AtCoder.jp is a Japanese online competitive programming platform that hosts algorithmic programming contests, practice problems, and virtual contests for programmers of all levels.

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Cost / License

  • Free
  • Proprietary

Platforms

  • Online
Tasks from Beginner Contest
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What is AtCoder?

AtCoder.jp is a Japanese online competitive programming platform that hosts algorithmic programming contests, practice problems, and virtual contests for programmers of all levels.

  • Main features: timed contests (regular and beginner-friendly), problem archives for practice, rated rankings, and user-submitted solutions.
  • Audience: competitive programmers, students, and developers preparing for coding interviews.
  • Contest formats: single-round contests, ABC/ARC/AGC-style events (AtCoder Beginner/Regular/Grand Contests), and practice/virtual contests to simulate past contests.
  • Languages and tools: supports common languages (C++, Python, Java, etc.) and provides a judge that runs and scores submitted code.
  • Community: leaderboards, user pages, and editorials for many contests.