There are several examples in the glpsol examples collection

• graph.mod shows the fanciest input format

• color.mod is more interesting from a modelling point of view

• vertex-cover.mod uses the graph from graph.mod for a vertex cover example.

• independent-set.mod uses the graph from graph.mod for an independent-set example. In this example the difference between the LP relaxation and the integer optimal is not too bad, compared to the worst case.

There are several examples distributed with glpsol