Defined in File SNAPGraphWriter.hpp
public NetworKit::GraphWriter (Class GraphWriter)
Write graph in the Georgia Tech SNAP (Small-world Network Analysis and Partitioning) (http://snap-graph.sourceforge.net/) file format (do not confuse this with the Stanford Network Analysis Project.) From the SNAP user guide:
A sample graph file in the SNAP format (.gr extension) (lines beginning with a # symbol indicate comments)
p denotes the problem line p <n> <m> <undirected/directed> <weight_type> <0 or 1-indexed>
n indicates the number of vertices.
m denotes the number of edges.
The third parameter can be either u denoting a undirected graph, or d denoting a directed graph. Internally, an edge <u, v> in an undirected graph is stored as two directed links u->v and v->u.
weight_type can be u (unweighted), i (integer), l (long, 8 bytes on 64-bit architectures), f (float), or d (double)
For the fifth parameter, 0 indicates that the valid range of vertex IDs is 0 to n-1. 1 indicates that it is 1 to n.
The problem line is followed by a listing on exactly m edges. The format is