摘要：原来矩阵树定理对于边是概率的情况也是适用的qwqwq。 "ref" cpp include include include using namespace std; int n; double w[55][55], uu; const double eps=1e 7; void gauss(){ f 阅读全文

摘要：矩阵树定理+模意义下整数高斯消元 cpp include include include include include using namespace std; typedef long long ll; typedef pair pii; int n, uu, vv, ww, w[21][21] 阅读全文

摘要：欲学矩阵树定理~~必先自宫~~学习 "一些行列式的姿势" 然后 "做一道例题" 阅读全文