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###### INSTANCE FORMAT ######
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The header describes the instances properties:
d_max: [maximum distance at which node pairs can communicate without using relays]
|V|: [number of vertices]
|A|: [number of arcs]
|NDC|: [number of node pairs that need to communicate]

The next line is a description:
Relay-Costs (cost x-coordinate y-coordinate):

Then follows a list of |V| items of the form:
[relay-cost] [relay x-coordinate] [relay y-coordinate]

The next line is a description:
Arcs (start end distance cost):

Then follows a list of |A| items of the form:
[vertex1] [vertex2] [distance] [cost]

The next line is a description:
NDC-pairs:

Then follows a list of |NDC| items of the form:
[start vertex] [target vertex]
{Note: This list is guaranteed to be lexicographically ordered according to (start vertex, target vertex)}

General Notes:
- The instances are consistently spaced following the above description (i.e. elements within a line are always separated by exactly one space).
- Lists of edges are lexicographically ordered according to (vertex1,vertex2).