[HDU6271]Master of Connected Component 题目大意: 给出两棵\(n(n\le10000)\)个结点的以\(1\)为根的树\(T_a,T_b\),和一个拥有\(m(m\le10000)\)个结点的图\(G\).\(T_a,T_b\)的每一个结点上都有一个信息,表示\(G\)中的一条边\((u_i,v_i)\).对于\(i\in[1,n]\),询问从\(T_a\)和\(T_b\)上分别取出链\(1\sim i\),将链上的信息所表示的边加入\(G\)中后,\(G…

题目链接  2017 CCPC Hangzhou Problem H 思路:对树进行分块.把第一棵树分成$\sqrt{n}$块,第二棵树也分成$\sqrt{n}$块.    分块的时候满足每个块是一个连通块,那么每个块就有一个共同的祖先. 把询问按照第一个点被第一棵树的哪个祖先管辖和第二个点被第二棵树的哪个祖先管辖,分成$n$类. 每一类询问一起处理,处理完后用可撤销并查集恢复到之前的状态. 每一类询问之间依次转移,每次转移,移动次数不会超过$\sqrt{n}$次. 最后总时间复杂度$O(n^{…

  Find the number Weak Connected Component in the directed graph. Each node in the graph contains a label and a list of its neighbors. (a connected set of a directed graph is a subgraph in which any two vertices are connected by direct edge path.) Ex…

Strongly Connected Components A directed graph is strongly connected if there is a path between all pairs of vertices. A strongly connected component (SCC) of a directed graph is a maximal strongly connected subgraph. For example, there are 3 SCCs in…

Find the Connected Component in the Undirected Graph Find the number connected component in the undirected graph. Each node in the graph contains a label and a list of its neighbors. (a connected component (or just component) of an undirected graph i…

Description Find connected component in undirected graph. Each node in the graph contains a label and a list of its neighbors. (A connected component of an undirected graph is a subgraph in which any two vertices are connected to each other by paths,…

Description Find the number Weak Connected Component in the directed graph. Each node in the graph contains a label and a list of its neighbors. (a weak connected component of a directed graph is a maximum subgraph in which any two vertices are conne…

E. Connected Component on a Chessboard time limit per test2 seconds memory limit per test256 megabytes inputstandard input outputstandard output You are given two integers b and w. You have a chessboard of size 109×109 with the top left cell at (1;1)…

题目: 找出无向图汇总的相连要素 请找出无向图中相连要素的个数. 图中的每个节点包含其邻居的 1 个标签和 1 个列表.(一个无向图的相连节点(或节点)是一个子图,其中任意两个顶点通过路径相连,且不与超级图中的其它顶点相连.) 样例 给定图: A------B C \ | | \ | | \ | | \ | | D E 返回 {A,B,D}, {C,E}.其中有 2 个相连的元素,即{A,B,D}, {C,E} 解题: 广度优先+递归,写不出来,程序来源 Java程序: /** * Defini…

传送门 注意到棋盘可以看成无限大的,那么只要考虑如何构造一个尽可能合法的情况 不妨假设需要的白色格子比黑色格子少 那么容易发现最好的情况之一就是白色排一排然后中间黑的先连起来,剩下黑色的再全部填白色周围 可以证明如果需要 $w$ 个白色格子,那么黑色格子的数量不能超过 $3w+1$ 证明:首先 $w=1$ 时显然 然后考虑下一个白色格子扩展,显然从一边延伸出去,然后又多了 $3$ 个可以放黑色的位置,这样一路扩展显然可以放 $3w+1$ 个黑色的位置 然后考虑证明没有更好的方案,显然除了第一次白…