Flight Planning

题目描述

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=78&page=show_problem&problem=2742 [PDF](https://uva.onlinejudge.org/external/116/p11695.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11695/5cafd011378e160a677f393023326efa95a92238.png)

输入输出格式

输入格式


![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11695/23c2a1a7299b9cac4ac8443171eb75a5fb42c00e.png)

输出格式


![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11695/fb7bbeb576255db9e9ae383390d4d5da3af0f366.png)

输入输出样例

输入样例 #1

2
4
1 2
2 3
3 4
14
1 2
1 8
2 3
2 4
8 9
8 10
8 11
4 5
4 6
4 7
10 12
10 13
13 14

输出样例 #1

2
3 4
2 4
5
1 8
2 10