这是一只连打三块铁牌的菜鸡的游记。
「Codeforces Round #551」F. Serval and Bonus Problem
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「NOI 2016」循环之美
「VK Cup 2015 - Finals」A. Logistical Questions
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「VK Cup 2018 - Round 1」E. Perpetual Subtraction
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「Codeforces Round #518」E. Random Forest Rank
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