161F
[ARC161F] Everywhere is Sparser than Whole (Judge)
Problem StatementWe define the density of a non-empty simple undirected graph as $\displaystyle\frac{(\text{number of edges})}{(\text{number of vertic ......
ARC161F Everywhere is Sparser than Whole (Judge)
[题面传送门](https://www.luogu.com.cn/problem/AT_arc161_f) 先大概移个项 ，就是要你找有没有非空真导出子图满足 $E-ND\geq 0$。 如果它只问了 $E-ND>0$ 这是经典的最大权闭合子图模型，令每条边为左部点，每个点为右部点，边的权值为 $1 ......