In order to achieve absolute safety providing electricity to the camps, besides an electric supplying system, the host organization set up a path from a reserved electricity generator (which is placed in one of the camps) to every camp once,
this means that, thare is only and only one path from Pi camp to Pj camp.

The answer should be a path (successive line segments)
NOT a tree (minimal spanning tree)
NOT a Steiner tree (minimal spanning tree with additional points)