Unique Attack Time Limit: 5 Seconds      Memory Limit: 32768 KB N supercomputers in the United States of Antarctica are connected into a network. A network has a simple topology: M different pairs of supercomputers are connected to each other by an o…

题意:判断最小割是否唯一. 分析:跑出最大流后,在残余网上从源点和汇点分别dfs一次,对访问的点都打上标记. 若还有点没有被访问到,说明最小割不唯一. https://www.cnblogs.com/ka200812/archive/2011/07/30/2121872.html 这里面的鬼畜图说的很清楚... #include<stdio.h> #include<iostream> #include<cstring> #include<queue> #in…

题意:给出n个字符,m对关系,让你输出三种情况:     1.若到第k行时,能判断出唯一的拓扑序列,则输出:         Sorted sequence determined after k relations: 序列     2.若到第k行,出现环,则输出:         Inconsistency found after k relations.     3.若直到m行后,仍判断不出唯一的拓扑序列,则输出:         Sorted sequence cannot be deter…

判断MST是不是唯一的 如果是唯一的 就输出最小的权值和 如果不是唯一的 就输出Not Unique! 次小生成树就是第二小生成树  如果次小生成树的权值和MST相等  那么MST就不是唯一的 法一: 先求出最小的权值和 然后一条边一条边的删先标记MST中所使用的边 删边就是屏蔽这条边后 再对剩下的边(不管这些边是否被标记)求MST 如果最后的权值和 与开始算出的最小的那个 相等 就说明不是唯一的 Sample Input 2 //T3 3 //n m1 2 1// u v w2 3 23 1…

题目链接: http://poj.org/problem?id=1679 Description Given a connected undirected graph, tell if its minimum spanning tree is unique. Definition 1 (Spanning Tree): Consider a connected, undirected graph G = (V, E). A spanning tree of G is a subgraph of G…

题意:给出n个点,m条边,要你判断最小生成树是否唯一. 思路:先做一次最小生成树操作,标记选择了的边,然后枚举已经被标记了的边,判断剩下的边组成的最小生成树是否与前面的相等,相等,则不唯一,否则唯一...... #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> using namespace std; struct node { int v1,v2; int d…

题目链接 Description Given a connected undirected graph, tell if its minimum spanning tree is unique. Definition 1 (Spanning Tree): Consider a connected, undirected graph G = (V, E). A spanning tree of G is a subgraph of G, say T = (V', E'), with the fol…

http://poj.org/problem?id=1679 Description Given a connected undirected graph, tell if its minimum spanning tree is unique. Definition 1 (Spanning Tree): Consider a connected, undirected graph G = (V, E). A spanning tree of G is a subgraph of G, say…

Pre- and Post-order Traversals PAT-1119 这题难度较大,主要需要考虑如何实现根据前序遍历和后序遍历来确定一颗二叉树 一篇好的文章: 题解 import java.util.Scanner; /** * @Author WaleGarrett * @Date 2020/9/5 18:04 */ public class PAT_1119 { static int[] preorder; static int[] postorder; static boolea…

Description Given a connected undirected graph, tell if its minimum spanning tree is unique.  Definition 1 (Spanning Tree): Consider a connected, undirected graph G = (V, E). A spanning tree of G is a subgraph of G, say T = (V', E'), with the followi…