zoj2412 dfs连通图

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zoj2412 #include<stdio.h> #include<iostream> #include<cstdio> #include<queue> #include<cmath> #include<cstring> #include<cstdlib> #include<climits> #include<algorithm> using namespace std; #define ll l…

Farm Irrigation ZOJ 2412（DFS连通图）

Benny has a spacious farm land to irrigate. The farm land is a rectangle, and is divided into a lot of samll squares. Water pipes are placed in these squares. Different square has a different type of pipe. There are 11 types of pipes, which is marked…

Oil Deposits（DFS连通图）

Description The GeoSurvComp geologic survey company is responsible for detecting underground oil deposits. GeoSurvComp works with one large rectangular region of land at a time, and creates a grid that divides the land into numerous square plots. It…

Lake Counting(DFS连通图)

Description Due to recent rains, water has pooled in various places in Farmer John's field, which is represented by a rectangle of N x M (1 <= N <= 100; 1 <= M <= 100) squares. Each square contains either water ('W') or dry land ('.'). Farmer…

tarjan求强连通分量的思考

我是按照这里的思路来的.这个博文只是感性理解. 递归树关于递归树,这篇博文讲的很好,我只是给自己总结一下. 定义vis数组,在dfs连通图时赋予它们不同的含义: vis=0,表示这个点没有被访问. vis=1,表示这个点被访问了,但是它的孩子还没有访问完. vis=2,表示这个点被访问了,并且它的孩子访问完了. 一个连通图,一定可以表示成一个递归树,加上一些边.这些边的种类有: 树边,也就是递归树上的边.表现为访问(u, v)时,\(vis[v]=0\). 回边,是一个点连向它递归树上的祖宗的…

dfs判断连通图（无向）

在图论中,连通图基于连通的概念.在一个无向图 G 中,若从顶点vi到顶点vj有路径相连(当然从vj到vi也一定有路径),则称vi和vj是连通的.如果 G 是有向图,那么连接vi和vj的路径中所有的边都必须同向.如果图中任意两点都是连通的,那么图被称作连通图.如果此图是有向图,则称为强连通图(注意:需要双向都有路径).图的连通性是图的基本性质. 严格定义(摘抄): 对一个图 G=(V,E) 中的两点 x 和 y ,若存在交替的顶点和边的序列 Γ=(x=v0-e1-v1-e2-...-ek-(v…

Battle Over Cities (25)（DFS、连通图）

It is vitally important to have all the cities connected by highways in a war. If a city is occupied by the enemy, all the highways from/toward that city are closed. We must know immediately if we need to repair any other highways to keep the rest of…