UVA10926 How Many Dependencies?

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=21&page=show_problem&problem=1867 [PDF](https://uva.onlinejudge.org/external/109/p10926.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10926/594e4bb5f1535f8dec219f2872c5fede06057c7d.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10926/502681d1fb3cdaf976c277e96791bcb01f061d9f.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10926/f5d11cb196e71653cc706715b5338b0d3486a025.png)