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2463:USTC campus network

题目描述
USTC campus network is a huge network. There is a bi-directional link between every pair of computers in the network. One of the computers is the BBS server, which is so popular that thousands of people log on it every day. Recently some links of the network are damaged by the rainstorm. The network administrator is going to check which computers are still connected with the BBS server directly or indirectly.

You are to help the administrator to report the number of computers still connecting with the BBS server (not including itself).
输入解释
The input consists of multiple test cases. Each test case starts with a line containing two integers N and M (1 ≤ N ≤ 10,000, 0 ≤ M ≤ 1,000,000), which are the number of computers and the number of damaged links in USTC campus network, respectively. The computers are numbered from 1 to N and computer 1 is the BBS server.
Each of the following M lines contains two integers A and B(1 ≤ A ≤ N, 1 ≤ B ≤ N, A ≠ B), which means the link between computer A and B is damaged. A link will appear at most once.

The last test case is followed by a line containing two zeros.
输出解释
For each test case, print a line containing the test case number( beginning with 1) followed by the number of computers still connecting with the BBS server.
输入样例
3 2
1 2
1 3
4 3
1 2
3 2
4 2
0 0
输出样例
Case 1: 0
Case 2: 2
来自杭电HDUOJ的附加信息
Recommend teddy

该题目是Virtual Judge题目,来自 杭电HDUOJ

源链接: HDU-2463

最后修改于 2020-10-25T22:53:40+00:00 由爬虫自动更新

共提交 0

通过率 --%
时间上限 内存上限
8000/4000MS(Java/Others) 32768/32768K(Java/Others)