UVA298 Race Tracks

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=4&page=show_problem&problem=234 [PDF](https://uva.onlinejudge.org/external/2/p298.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA298/a3cec0d97362451dc791eafe9bcd37a26c900767.png)

Input Format

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Output Format

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