It's a recommend system of programming problem in AtCoder by Collaborative Filtering
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README.md

AtCoder-Recommendation

協調フィルタリングを使ってAtCoderの問題を提案します。(ユーザーベース)
ユーザー間の類似度は平方ユークリッド距離を用います。
http://sandbox.ugwis.net/recommend/