UVA11848 Cargo Trains

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=226&page=show_problem&problem=2948 [PDF](https://uva.onlinejudge.org/external/118/p11848.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11848/b17902c32e46ea40eab359bb76cfdb7bf7767c9d.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11848/b14386436a436ccfadd9ca9aadad59827468c062.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11848/07b854f7f360baba03cf7eabb0525b9cdedb23a6.png)