11391: How Big Is It?
Memory Limit：128 MB
Time Limit：1.000 S
Judge Style：Text Compare
Creator：
Submit：1
Solved：0
Description
Sample Input Copy
3
3 2.0 1.0 2.0
4 2.0 2.0 2.0 2.0
3 2.0 1.0 4.0
Sample Output Copy
9.657
16.000
12.657