J - 拓补排序进阶1 Time Limit:1000MS Memory Limit:32768KB 64bit IO Format:%I64d & %I64u Submit Status Description ACM-DIY is a large QQ group where many excellent acmers get together. It
题面 题目链接:传送门 Petya and Vasya arranged a game. The game runs by the following rules. Players have a directed graph consisting of n vertices and m edges. One of the vertices contains a chip. Initially
P r o b l e m \mathrm{Problem} Problem S o l u t i o n \mathrm{Solution} Solution 显然,仙人掌不存在复杂环,这是这道题解题的关键。 对于割边,我们可以直接删。删一条边,贡献为1.对于简单环,若删 k k k条边,贡献是 k − 1 k-1 k−1. 我们需要判出所有的简单环,但是我们需要解决的难题是
(未更新完、做到相关题再更新相关部分 文章目录 无向图判断有无环并输出环上点 无向图判断有无环并输出环上点 例题:H. Mad City 利用变种拓扑排序,先把度为1的点存入队中,每次取出队头,遍历邻接点,再将该条边删除也就是将邻接点度数减一,直至对空,然后所有度数不为0的点都是在环上的点,输出即可 code for (int i = 0; i < n; i ++ ){