AtCoder

free

Japan-origin platform with weekly high-quality contests

ABC/ARC/AGC/AHC lineups. Strict AI rules on ARC/AGC.

URL	https://atcoder.jp
Tier	free
Relevance	low
Last active signal	ABC 459 2026-05-22; new Weekday series May 2026
Verified alive	yes
Category	Competitive

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