UVA12192 Grapevine

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=243&page=show_problem&problem=3344 [PDF](https://uva.onlinejudge.org/external/121/p12192.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12192/e8af913b1a6b5b9589aa550d230771d0e834d891.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12192/12ff73c2fb58a00a386bd2f1aad8f5ea901dc7f0.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12192/e4343b092ae0a7d09011c49cdc5d26de8e54a00a.png)