龙头滴水 Faucet Flow

题目描述

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=15&page=show_problem&problem=1307 [PDF](https://uva.onlinejudge.org/external/103/p10366.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10366/40742afaeaad84f51add9411dd6ca95773585099.png)

输入输出格式

输入格式


![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10366/4b47e59e623fccfac7783776d8ea53f8ae26c7e4.png)

输出格式


![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10366/05e95c47bc62dcb714bfe8e3634274fd155c423c.png)

输入输出样例

输入样例 #1

-1 1
3 5
-3 3
4 3 2 1
-3 5
1 2 2 1 1
0 0

输出样例 #1

6
6
8