CSU 1805 Three Capitals(BEST定理、MatrixTree定理)

题意: $给定无向图3个点A、B、G,AB间有a条边,AG间有b条边,BG间有c条边$$求从A出发回到A的欧拉回路的个数,答案模10^9+7$     Read more
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TaoSama Sep 22, 2016