P3073

[Problem](https://www.luogu.com.cn/problem/P3073) ### Solution 和[汽车拉力比赛](https://www.cnblogs.com/SXqwq/p/17455232.html)差不多，思路都是二分，二分$d$,但是汽车拉力比赛从一个路标开 ......