题意: 给你一张有向图,问你最少加多少条边这张图强连通 思路: 缩点之后,如果不为1个点,答案为出度为0与入度为0的点的数量的最大值 代码: #include<iostream> #include<cstdio> #include<algorithm> #include<cmath> #include<cstring> #include<string> //#include<stack> #include<queue…

Equivalent Sets Time Limit: 12000/4000 MS (Java/Others)    Memory Limit: 104857/104857 K (Java/Others) Problem Description To prove two sets A and B are equivalent, we can first prove A is a subset of B, and then prove B is a subset of A, so finally…

题目描述 “这一切都是命运石之门的选择.” 试图研制时间机器的机关SERN截获了中二科学家伦太郎发往过去的一条短 信,并由此得知了伦太郎制作出了电话微波炉(仮). 为了掌握时间机器的技术,SERN总部必须尽快将这个消息通过地下秘密通讯 网络,传达到所有分部. SERN共有N个部门(总部编号为0),通讯网络有M条单向通讯线路,每条线 路有一个固定的通讯花费Ci. 为了保密,消息的传递只能按照固定的方式进行:从一个已知消息的部门向 另一个与它有线路的部门传递(可能存在多条通信线路).我们定义总费用为…

既然没有题解,那么我就来提供给一份. -- 首先我们看到数据范围.妈耶!数据这么大,一开始还想用个DP来做,但是看着就不行,那么根据这个数据范围,我们大致可以猜到这道题的算法是一个贪心,那么我们怎么贪呢? 我们首先还是先画一个图: 样例解释一下: 我们取的点是\(3\),\(5\),\(7\). 看到题目,因为\(1\)号节点的入度为0,那么就一定不能选择\(1\)号节点,那么接下来可以供我们选择的最大的权值的点也就只有\(3\),\(5\),\(7\)号节点,那么我们就来一个贪心策略:对每一个…

Equivalent Sets Time Limit: 12000/4000 MS (Java/Others)    Memory Limit: 104857/104857 K (Java/Others)Total Submission(s): 3568    Accepted Submission(s): 1235 Problem Description To prove two sets A and B are equivalent, we can first prove A is a su…

主题链接: http://acm.hdu.edu.cn/showproblem.php? pid=3836 Equivalent Sets Time Limit: 12000/4000 MS (Java/Others)    Memory Limit: 104857/104857 K (Java/Others) Total Submission(s): 2890    Accepted Submission(s): 1006 Problem Description To prove two se…

题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=3836 Equivalent Sets Description To prove two sets A and B are equivalent, we can first prove A is a subset of B, and then prove B is a subset of A, so finally we got that these two sets are equivalent.Y…

Equivalent Sets Time Limit: 12000/4000 MS (Java/Others)    Memory Limit: 104857/104857 K (Java/Others) Total Submission(s): 2798    Accepted Submission(s): 962 Problem Description To prove two sets A and B are equivalent, we can first prove A is a su…

Equivalent Sets Time Limit: 12000/4000 MS (Java/Others)    Memory Limit: 104857/104857 K (Java/Others) Total Submission(s): 4782    Accepted Submission(s): 1721 Problem Description To prove two sets A and B are equivalent, we can first prove A is a s…

http://acm.hdu.edu.cn/showproblem.php?pid=2767 Proving Equivalences Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 8605    Accepted Submission(s): 3063 Problem Description Consider the followin…