[POJ3694]Network（LCA, 割边, 桥）

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[POJ3694]Network（LCA, 割边, 桥）

题目链接:http://poj.org/problem?id=3694 题意:给一张图,每次加一条边,问割边数量. tarjan先找出所有割边,并且记录每个点的父亲和来自于哪一条边,然后询问的时候从两个点向上找lca,沿途更新割边数量和割边状态即可. AC代码 /* ━━━━━┒ギリギリ♂ eye! ┓┏┓┏┓┃キリキリ♂ mind! ┛┗┛┗┛┃＼○/ ┓┏┓┏┓┃ / ┛┗┛┗┛┃ノ) ┓┏┓┏┓┃ ┛┗┛┗┛┃ ┓┏┓┏┓┃ ┛┗┛┗┛┃ ┓┏┓┏┓┃ ┛┗┛┗┛┃ ┓┏┓┏┓┃ ┃┃┃┃…

D - Network - poj3694（LCA求桥）

题意:有一个网络有一些边相互连接,现在有Q次操作,求每次操作后的桥的个数分析:开始竟然不知道还有LCA这么个东西....... ***************************************************************** #include<stdio.h> #include<; ]; ; ; i<=N; i++) { Head[i] = -; dfn[i] = ; isbridg…

【POJ 3694】 Network（割边<桥>+LCA）

[POJ 3694] Network(割边+LCA) Network Time Limit: 5000MS Memory Limit: 65536K Total Submissions: 7971 Accepted: 2902 Description A network administrator manages a large network. The network consists of N computers and M links between pairs of comput…

[POJ3694]Network（Tarjan，LCA）

[POJ3694]Network Description A network administrator manages a large network. The network consists of N computers and M links between pairs of computers. Any pair of computers are connected directly or indirectly by successive links, so data can be t…

HDU 4738——Caocao's Bridges——————【求割边/桥的最小权值】

Caocao's Bridges Time Limit:1000MS Memory Limit:32768KB 64bit IO Format:%I64d & %I64u Submit Status Practice HDU 4738 Description Caocao was defeated by Zhuge Liang and Zhou Yu in the battle of Chibi. But he wouldn't give up. Caocao's army s…

POJ3694 Network(Tarjan双联通分图 LCA 桥)

链接:http://poj.org/problem?id=3694 题意:给定一个有向连通图,每次增加一条边,求剩下的桥的数量. 思路: 给定一个无向连通图,添加一条u->v的边,求此边对图剩余的桥的数量的影响: 若u,v在同一个边双联通分量中,则是否添加无影响.否则从u,v的LCA到u,v的边上所有的桥都不再是桥. 在Tarjan算法中,对在同一个边双联通分量中的点使用并查集合并,实现缩点,同时记录父亲节点.若u,v属于不同的边双连通分量,将dfn较大的点(设为v)向上合并直到dfn[v] <…

POJ3694 Network —— 边双联通分量 + 缩点 + LCA + 并查集

题目链接:https://vjudge.net/problem/POJ-3694 A network administrator manages a large network. The network consists of N computers and M links between pairs of computers. Any pair of computers are connected directly or indirectly by successive links, so d…