题目:Hire and Fire 题目翻译成数据结构就是:建树,加结点,删除结点,打印结点.只有删除结点稍微复杂点,因为删除设计掉树的调整. 首先要考虑树怎么存储才能使解题更顺手. 1.我们要存储每个结点的孩子,父亲和名字.存储孩子是因为第一个孩子可能会“升级”,存储父亲是因为要打印,名字肯定也是要打印的: 2.我们要知道每个结点的子树,删除结点会涉及调整: 3.我们要知道根节点,存放CEO. 所以我们的结点出来了,如下: struct Tman { string name; Tman *fat…

Hire and Fire Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 2316   Accepted: 655 Description In this problem, you are asked to keep track of the hierarchical structure of an organization's changing staff. As the first event in the life…

HDU认为1>2,3>2不是树,POJ认为是,而Virtual Judge上引用的是POJ数据这就是唯一的区别....(因为这个瞎折腾了半天) 此题因为是为了熟悉并查集而刷,其实想了下其实好好利用sort应该能更简单A掉,下次有空再去试试... 题目大意:判断是否为树,so: 1,无环: 2,除了根,所有的入度为1,根入度为0: 3,这个结构只有一个根,不然是森林了:4.空树也是树,即第一次输入的两个数字为0 0则是树,其他时候输入只是结束条件 因为POJ和HDU题面一样,要求不一样,所以这题…

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…

POJ题目网址:http://poj.org/problem?id=1308 HDU题目网址:http://acm.hdu.edu.cn/showproblem.php?pid=1272 并查集的运用,如果想要形成一棵树,那么我们应该只能有一个根,并查集联合次数为节点数-1. //Asimple //#include <bits/stdc++.h> #include <iostream> #include <sstream> #include <algorithm…

Is It A Tree? Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 18778   Accepted: 6395 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…

Is It A Tree? Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 6961    Accepted Submission(s): 1619 [题目链接]http://acm.hdu.edu.cn/showproblem.php?pid=1325 这题如果用并查集做的话,最后判断的时候还是要看一个结点的入度是否为大于1(纯并查集的…

Is It A Tree? Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 24237   Accepted: 8311 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…

Is It A Tree? 题目链接: http://acm.hust.edu.cn/vjudge/contest/123393#problem/M 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 satisfy…

Is It A Tree? Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 31092   Accepted: 10549 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 edg…