UVA11307 Alternative Arborescence

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=25&page=show_problem&problem=2282 [PDF](https://uva.onlinejudge.org/external/113/p11307.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11307/912216cb32c3069b635a454ace4a10b453c99ab8.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11307/965fb339e68879cdedbdfb6c74415099167acf75.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11307/57db9e790dee70e925a4bcf02a084a0deab0b3d5.png)