Stand in a Line

题目描述

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=23&page=show_problem&problem=2115 [PDF](https://uva.onlinejudge.org/external/111/p11174.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11174/1ccdf7a5e8daaea20fb96410344e60f59ced2b5d.png)

输入输出格式

输入格式


![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11174/65469ff47c323448f0ec9030f81ff2fdb610de9b.png)

输出格式


![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11174/bd9de1d869c33e2002b2b8cdd7f83725b57b0e05.png)

输入输出样例

输入样例 #1

3
3 2
2 1
3 1
3 0
3 1
2 1

输出样例 #1

2
6
3