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 birds, tell if they are on the same tree.
Input Specification:
Each input file contains one test case. For each case, the first line contains a positive number N (≤104) which is the number of pictures. Then N lines follow, each describes a picture in the format:
K B1 B2 ... BK
where K is the number of birds in this picture, and Bi's are the indices of birds. It is guaranteed that the birds in all the pictures are numbered continuously from 1 to some number that is no more than 104.
After the pictures there is a positive number Q (≤104) which is the number of queries. Then Q lines follow, each contains the indices of two birds.
Output Specification:
For each test case, first output in a line the maximum possible number of trees and the number of birds. Then for each query, print in a line Yes
if the two birds belong to the same tree, or No
if not.
Sample Input:
43 10 1 22 3 44 1 5 7 83 9 6 4210 53 7
Sample Output:
2 10YesNo
题目大意:给出几张照片,照片中有几只鸟,判断是否在一棵树上。
#include#include #include
//这个AC了,出现的问题在下。
1.忽略了输出要求,原来是要求输出树的数量以及鸟的总数量;
2.需要初始化bird数组为i,这个是需要一个for循环的,不可少的。
3.再次复习了并查集的两个函数怎么写。