UVA12214 交通堵塞 Traffic Jam

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=244&page=show_problem&problem=3366 [PDF](https://uva.onlinejudge.org/external/122/p12214.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12214/a9cf058dccc9e163b87629684e3bd69398ee8e23.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12214/a5d4bf3d0f8eaea5c0b90734622f18de5f5e4675.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12214/1cec6a31e1d2c8ff2c099442f5b09794f73518c9.png)