I am total novice, but I must solve this problem very quick and need help. Problem:I’ve been given a file

1 2 15

1 3 16

2 3 20

and so on…First two values of the input file represents graph nodes and the third one is distance between them. I know the number of nodes(in previous example number of nodes is 4, counting starts from 0)

I need perl code that makes a matrix that looks like this:

0 0 0 0

0 0 15 16

0 15 0 20

0 16 20 0

Thanks in advance!!!