点双联通图计数

题目html 比边双联通图计数多了一点小技巧。c++ F ( x ) = ∑ i = 0 2 ( i 2 ) x i i ! F(x) = \sum_{i=0} \frac {2^{\binom i2}x^i} {i!} F(x)=∑i=0​i!2(2i​)xi​有标号无向图数量。 D ( x ) = ϑ ln ⁡ F ( x ) = [ ln ⁡ F ( x ) ′ ] x D(x) = \va

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