A Dangerous Maze (II)

题目描述

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=279&page=show_problem&problem=3842 [PDF](https://uva.onlinejudge.org/external/124/p12411.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12411/d2488a04b4a832347b32c8938707bf08d9e7fe9e.png)

输入输出格式

输入格式


![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12411/20502f653748d9e741b568f44fcc3cc8154966e5.png)

输出格式


![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12411/e08dd49d44eca6b6c57a28787efb7b07ec710ebc.png)

输入输出样例

输入样例 #1

4
2 0
10 10
2 0
10 -10
3 1
10 -10 -20
3 2
10 -10 -20

输出样例 #1

Case 1: 10.000
Case 2: 20.000
Case 3: 30.000
Case 4: 25.000