Reads in a test file as shown below:

< weight >
  < weight >

Example:
5
6
0 3 8
1 2 20
2 3 5
1 3 9
2 4 11
0 4 16

Output:
MST for input graph:
(v2,v3), (v1,v3), (v0,v3), (v2,v4)
Total weight: 23