UVA13050 Discovering Paths

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=866&page=show_problem&problem=4948 [PDF](https://uva.onlinejudge.org/external/130/p13050.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13050/2be1dc116547d2ad9a064d715b656012122093ba.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13050/e999cc82c3553f16478acd295a74f70c39441394.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13050/226524af35d7f60b2f7a8b9af3c77db356935048.png)