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  How Many Points of Intersection?  We have two rows. There are a dots on the top row and b dots on the bottom row. We draw line segments connecting every dot on the top row with every dot on the bottom row. The dots are arranged in such a way that t…
We have two rows. There are a dots on the top row and b dots on the bottom row. We draw line segmentsconnecting every dot on the top row with every dot on the bottom row. The dots are arranged in sucha way that the number of internal intersections am…
uva10790:http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=1731 题意:两条水平线,分别有n,m个点,点之间两两连线,求有多少个交点. 题解:手动模拟一下,然后用不完全归纳法,就可以得到公式ans=(n-1)*n/2*(m-1)*m/2; #include<iostream> #include<cstdio>…
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 How Many Points of Intersection?  We have two rows. There are a dots on the toprow andb dots on the bottom row. We draw line segments connecting every dot on the top row with every dot on the bottom row. The dots are arranged in such a way that the…
题目链接 https://www.luogu.org/problemnew/show/U56187 注:题面参考了网上的其他博客,并非原题题面,因此数据范围可能有误.数据为原创数据. 题解 其实就是许多板子码到一起. 首先对于边缘上的任意一点 \(u\),假设离它最远的顶点为 \(A\),那么我们称点 \(u\) 位于顶点 \(A\) 的控制范围之中.我们考虑在没有石雕的情况下怎么求出每个顶点的控制范围.对于除顶点 \(A\) 之外的任意一个顶点 \(B\),连接 \(AB\) 并作 \(AB\…