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If there are the request to hold competitive programming contest, an inquiry of the business, please refer as follows from contact information. We give all a response best as possible as we can. But we may not cope depending on contents. To have understood it beforehand; thanking you in advance.

Please refer to this for the contest held request.

contest@atcoder.jp

Please refer to this for other inquiries.

support@atcoder.jp
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