2018牛客暑期多校第一場B（組合數學dp）

連接：https://www.nowcoder.com/acm/contest/139/B 來源：牛客網ios 題面：Symmetric Matrix Count the number of n x n matrices A satisfying the following condition modulo m. * Ai, j ∈ {0, 1, 2} for all 1 ≤ i, j ≤ n.

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