编程介的小学生 2016-12-21 07:05 采纳率: 20.5%
浏览 949
已采纳

The mysterious X network

Description

One of the reasons for which École polytechnique (nicknamed X" for reasons to be explained during the debriefing talk) is so deeply rooted in French society is its famous network of camarades - former students of the same school. When one camarade wants something (money, job, etc.), he can ask this network for help and support. In practice, this means that when he/she wants to reach some other camarade, not always of the same year, then surely he can find intermediate camarades to get to her/him. Note that thecamarade" relationship is symmetric. Due to the magic of the X network, there is always a means to reach anybody.

The program you have to write is supposed to help to minimize the number of these intermediate camarades.
Input

The huge file of all living camarades is simplified so as to obey the following format. The first line in the file is the number of camarades, say N , an integer 1<=N<=105 . Camarades are labeled from 0 to N - 1 . Follow N lines. Each line starts with the camarade label c , followed by the number of other camarades he/she knows, say nc , followed by the labels of those nc camarades. All these integers are separated by a single blank. It is assumed that nc is always less than 100. The last line in the file is the label of the camarade seeking help (say c1 ) followed by the label of the camarade he wants help from, say c2 ( c2 != c1 ).
Output

Your program should output three integers separated by a blank: c1 , c2 and the minimal number of intermediate camarades to reach c2 .
Sample Input

4
0 3 1 2 3
1 1 0
2 2 0 3
3 2 0 2
1 2
Sample Output

1 2 1

  • 写回答

1条回答 默认 最新

  • threenewbee 2016-12-24 16:15
    关注
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论

报告相同问题?

悬赏问题

  • ¥15 求差集那个函数有问题,有无佬可以解决
  • ¥15 【提问】基于Invest的水源涵养
  • ¥20 微信网友居然可以通过vx号找到我绑的手机号
  • ¥15 寻一个支付宝扫码远程授权登录的软件助手app
  • ¥15 解riccati方程组
  • ¥15 display:none;样式在嵌套结构中的已设置了display样式的元素上不起作用?
  • ¥15 使用rabbitMQ 消息队列作为url源进行多线程爬取时,总有几个url没有处理的问题。
  • ¥15 Ubuntu在安装序列比对软件STAR时出现报错如何解决
  • ¥50 树莓派安卓APK系统签名
  • ¥65 汇编语言除法溢出问题