UVA965 Police Road Blocks

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=11&page=show_problem&problem=906 [PDF](https://uva.onlinejudge.org/external/9/p965.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA965/97b4ace46614a6ef68141f3c7ddb997a19ac1db6.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA965/c3ffb596bf260bc645125922356c474721324863.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA965/585b5633f27b851bfc117396e35575d6fd9e9f7e.png)