Help us understand the problem. What is going on with this article?

第26回オフラインリアルタイムどう書くの問題

オフラインでリアルタイムに「どう書く」をやるイベント( http://yhpg.doorkeeper.jp/events/15316 )を行っています。

問題は「三種類の境界線」という名前で、詳細は
http://nabetani.sakura.ne.jp/hena/ord26tribo/
です。

出題者の気分としては、問題を読み始めてから解けるまで1時間ぐらいあれば足りるかな、と思ってますが、ひとそれぞれで。

実装ができた方はこちらのコメント欄からリンクを張っていただくと見つけやすくて助かります。

似たような問題をもっと解きたいという方は、
https://nabetani.hatenadiary.com/entry/yhpg_list
に過去問リンク集がありますので、そちらをご覧になると良いと思います。

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