UVA11838 Come and Go

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=226&page=show_problem&problem=2938 [PDF](https://uva.onlinejudge.org/external/118/p11838.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11838/2a9a0a94936ff47499e49523a9bb0e43dd39628c.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11838/3072127913082cacaabe2df605afbdc132cb648c.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11838/bbdb0b32e9cde3270f7dd4213a5f959dcb296393.png)