HBC231086“大 数 据”,语言题Strange_Permutations题解 （givenapermutation）

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Given a permutation PPP of {1,2,,n}{1,2,cdots, n}{1,2,,n}, determine the number of {1,2,,n}{1,2,cdots, n}{1,2,,n} permutations QQQ satisfying that i∈{1,2,,n1},Qi+1≠PQifora

Given a permutation PPP of {1,2,⋯ ,n}{1,2,cdots, n}{1,2,⋯,n}, determine the number of {1,2,⋯ ,n}{1,2,cdots, n}{1,2,⋯,n} permutations QQQ satisfying that ∀i∈{1,2,⋯ ,n−1},Qi+1≠PQiforall i in {1, 2, cdots, n - 1}, Q_{i+1} neq P_{Q_i}∀i∈{1,2,⋯,n−1},Qi+1​​=PQi​​. Output the number modulo 998244353998244353998244353.

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标签： HBC231086“大 数 据” 语言题Strange_Permutations题解