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1107 Social Clusters (30 分)1107 Social Clusters (30 分)（并查集）
When register on a social network, you are always asked to specify your hobbies in order to find some potential friends with the same hobbies. A "social cluster" is a set of people who have some of their hobbies in common. You are supposed to fi【查并集】java代码实现
思路 查并集是针对多树情况下的一种处理方式，核心是两个方法 1.find()：用于在多树情况下检查两个节点是否属于同一棵树内 2.join()：用于合并两棵树 节点类构造 info用于存储信息，pre用于存储该节点的前驱节点，isFather用于表示该节点是否是父亲节点 private int info; pri【PAT刷题甲级】1107.Social Clusters & 1118.Birds in Forest
1107 Social Clusters (30 分) When register on a social network, you are always asked to specify your hobbies in order to find some potential friends with the same hobbies. A social cluster is a set of people who have some of their hobbies in common. You1107 Social Clusters (30 point(s))
1107 Social Clusters (30 point(s)) When register on a social network, you are always asked to specify your hobbies in order to find some potential friends with the same hobbies. A social cluster is a set of people who have some of their hobbies in commonHow Many Tables——HDU 1213
How Many Tables 题目InputOutput 思路代码结果 题目 Today is Ignatius’ birthday. He invites a lot of friends. Now it’s dinner time. Ignatius wants to know how many tables he needs at least. You have to notice that not all the friends know each other,洛谷P1551 找亲戚（并查集基础）
题目背景 若某个家族人员过于庞大，要判断两个是否是亲戚，确实还很不容易，现在给出某个亲戚关系图，求任意给出的两个人是否具有亲戚关系。 题目描述 规定：x和y是亲戚，y和z是亲戚，那么x和z也是亲戚。如果x,y是亲戚，那么x的亲戚都是y的亲戚，y的亲戚也都是x的亲戚。 输入格式 第一行：三个整1118 Birds in Forest (25分)
Some scientists took pictures of thousands of birds in a forest. Assume that all the birds appear in the same picture belong to the same tree. You are supposed to help the scientists to count the maximum number of trees in the forest, and for any pair of备战快速复习--day10
PAT A1034 并查集或者使用DFS图都可以 题目给定一群人沟通时长，有沟通过的全部算成一组（a和b打，b和c打，a和c一族的），看有几个组大于俩人且权值大于k 首先：并查集 几个需要注意的点 1、输出结果需要是按照字母顺序排序的 2、这个来回都是1000，那么开数组要开到两千，包括father的初始，踩坑了 3PAT甲级——A1118 Birds in Forest【25】
Some scientists took pictures of thousands of birds in a forest. Assume that all the birds appear in the same picture belong to the same tree. You are supposed to help the scientists to count the maximum number of trees in the forest, and for any pair ofPAT甲级——A1107 Social Clusters
When register on a social network, you are always asked to specify your hobbies in order to find some potential friends with the same hobbies. A social cluster is a set of people who have some of their hobbies in common. You are supposed to find all the c红色警报 并查集
#include <bits/stdc++.h> using namespace std; const int maxn=501,maxsize=5001; int father[maxn]; bool visited[maxn]={false};//表示该城市是否被攻占 struct Edge { int u; int v; }; struct Edge edge[maxsize]; int findfather(int x) { if(x==fa☆1107
---恢复内容开始--- 并查集 findFather和Union两个函数 findFather里有路径压缩； 路径压缩： while(a!=index){ //a是节点，index是a的根 int tmp=a; a=father[a]; father[a]=index; } cmp的形参为数组元素 ---恢复内容结束---