PAT甲级--1114 Family Property（25 分）【并查集】

1114 Family Property（25 分）

This time, you are supposed to help us collect the data for family-owned property. Given each person's family members, and the estate（房产）info under his/her own name, we need to know the size of each family, and the average area and number of sets of their real estate.

Input Specification:

Each input file contains one test case. For each case, the first line gives a positive integer N (≤1000). Then N lines follow, each gives the infomation of a person who owns estate in the format:

ID Father Mother k Child​1​​⋯Child​k​​ M​estate​​ Area

where ID is a unique 4-digit identification number for each person; Father and Mother are the ID's of this person's parents (if a parent has passed away, -1 will be given instead); k (0≤k≤5) is the number of children of this person; Child​i​​'s are the ID's of his/her children; M​estate​​ is the total number of sets of the real estate under his/her name; and Area is the total area of his/her estate.

Output Specification:

For each case, first print in a line the number of families (all the people that are related directly or indirectly are considered in the same family). Then output the family info in the format:

ID M AVG​sets​​ AVG​area​​

where ID is the smallest ID in the family; M is the total number of family members; AVG​sets​​ is the average number of sets of their real estate; and AVG​area​​ is the average area. The average numbers must be accurate up to 3 decimal places. The families must be given in descending order of their average areas, and in ascending order of the ID's if there is a tie.

Sample Input:

10
6666 5551 5552 1 7777 1 100
1234 5678 9012 1 0002 2 300
8888 -1 -1 0 1 1000
2468 0001 0004 1 2222 1 500
7777 6666 -1 0 2 300
3721 -1 -1 1 2333 2 150
9012 -1 -1 3 1236 1235 1234 1 100
1235 5678 9012 0 1 50
2222 1236 2468 2 6661 6662 1 300
2333 -1 3721 3 6661 6662 6663 1 100

Sample Output:

3
8888 1 1.000 1000.000
0001 15 0.600 100.000
5551 4 0.750 100.000

解题思路：这题用了并查集，了解并查集可以看看https://blog.csdn.net/Imagirl1/article/details/82353349，了解这里用2个结构，一个存储答案，一个用来处理输入数据，并查集就是来找有多少个家族，然后统计每个家族有多少人多少sets多少area，然后注意下输出来就好了，这里-1的人不要处理。

#include
using namespace std;
struct Data{//处理输入数据
	int id,fid,mid;
	int c[6];
	int num,area;
};
struct Ans{//答案的元素
	int id,people;
	double num,area;
	bool flag;//flag是最终的父亲节点为true，多少个true，多少个家庭
};
Ans ans[10000];
Data data[10000];

bool cmp(Ans a,Ans b)//答案输出的顺序
{
	if(a.area!=b.area) return a.area>b.area;
	else return a.idfa2) father[fa1]=fa2;
	else if(fa1