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发表于 2022-08-26 02:55:46
J Jellyfish and its dream 题意:给定长度为 nnn 的环形序列 a0,a1,⋯ ,an−1a_0,a_1,\cdots,a_{n-1}a0​,a1​,⋯,an−1​,仅由 0,1,20,1,20,1,2 构成。若 ai+1≡ai mod n+1(mod3)a_i+1 \eq 展开全文

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