问题1047--A MST Problem

1047: A MST Problem

时间限制: 1 Sec  内存限制: 32 MB
提交: 1  解决: 1
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题目描述

It is just a mining spanning tree ( 最小生成树 ) problem, what makes you a little difficult is that you are in a 3D space.


输入

The first line of the input contains the number of test cases in the file. And t he first line of each case
contains one integer numbers n(0<n<30) specifying the number of the point . The n next n line s, each line
contain s Three Integer Numbers xi,yi and zi, indicating the position of point i.

输出

For each test case, output a line with the answer, which should accurately rounded to two decimals .


样例输入

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

样例输出

1.41
3.97

来源/分类

20100831湖工大校赛 

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