hdu 1325 判断有向图是否为树

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hdu 1325 判断有向图是否为树

题意:判断有向图是否为树链接:点我这题用并查集判断连通,连通后有且仅有1个入度为0,其余入度为1,就是树了 #include<cstdio> #include<iostream> #include<algorithm> #include<cstring> #include<cmath> #include<queue> #include<map> using namespace std; #define MOD 1000…

POJ——1308Is It A Tree?（模拟拓扑排序判断有向图是否为树）

Is It A Tree? Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 28399 Accepted: 9684 Description A tree is a well-known data structure that is either empty (null, void, nothing) or is a set of one or more nodes connected by directed edge…

迷宫城堡 HDU - 1269 判断有向图是否是强连通图

为了训练小希的方向感,Gardon建立了一座大城堡,里面有N个房间(N<=10000)和M条通道(M<=100000),每个通道都是单向的,就是说若称某通道连通了A房间和B房间,只说明可以通过这个通道由A房间到达B房间,但并不说明通过它可以由B房间到达A房间.Gardon需要请你写个程序确认一下是否任意两个房间都是相互连通的,即:对于任意的i和j,至少存在一条路径可以从房间i到房间j,也存在一条路径可以从房间j到房间i. Input输入包含多组数据,输入的第一行有两个数:N和M,接下来的M行每…

hdu 1325 Is It A Tree? (树、node = edge + 1、入度 <= 1、空树)

Is It A Tree?Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 29483 Accepted Submission(s): 6775 Problem DescriptionA tree is a well-known data structure that is either empty (null, void, noth…

hdu 1325(并查集)

Is It A Tree? Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 19907 Accepted Submission(s): 4472 Problem Description A tree is a well-known data structure that is either empty (null, void, no…

hdu 1325 && poj 1308 Is It A Tree?(并查集)

Description A tree is a well-known data structure that is either empty (null, void, nothing) or is a set of one or more nodes connected by directed edges between nodes satisfying the following properties. There is exactly one node, called the root, t…