UVA680 Movement of Reading Head

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=8&page=show_problem&problem=621 [PDF](https://uva.onlinejudge.org/external/6/p680.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA680/cd083ad7e0beee8d794a13735bef87a92daf03a1.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA680/e35508ebf19e0579f3f0a21cf535b25fc93cb08b.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA680/684e0f5d39f73c438502703b81aa7062d13bb02d.png)