3.6. igraph_subisomorphic_vf2 — Decide subgraph isomorphism using VF2

3.6. `igraph_subisomorphic_vf2` — Decide subgraph isomorphism using VF2

int igraph_subisomorphic_vf2(const igraph_t *graph1, const igraph_t *graph2, 
			     igraph_bool_t *iso, igraph_vector_t *map12, 
			     igraph_vector_t *map21);

Decides whether a subgraph of graph1 is isomorphic to graph2. It uses igraph_subisomorphic_function_vf2().

Arguments:

`graph1`:	The first input graph, may be directed or undirected. This is supposed to be the larger graph.
`graph2`:	The second input graph, it must have the same directedness as `graph1`. This is supposed to be the smaller graph.
`iso`:	Pointer to a boolean. The result of the decision problem is stored here.
`map12`:	Pointer to a vector or `NULL`. If not `NULL`, then an isomorphic mapping from `graph1` to `graph2` is stored here.
`map21`:	Pointer to a vector ot `NULL`. If not `NULL`, then an isomorphic mapping from `graph2` to `graph1` is stored here.

Returns:

Error code.

Time complexity: exponential.