Function is_series_parallel 

pub fn is_series_parallel(graph: &Graph) -> IgraphResult<bool>

Check whether a graph is series-parallel.

A graph is series-parallel if it has no K_4 minor. The test works by iterative series and parallel reductions.

Directed graphs are treated as undirected.

Examples

use rust_igraph::{Graph, is_series_parallel};

// Path: trivially series-parallel
let mut g = Graph::with_vertices(4);
g.add_edge(0, 1).unwrap();
g.add_edge(1, 2).unwrap();
g.add_edge(2, 3).unwrap();
assert!(is_series_parallel(&g).unwrap());

// K_4: NOT series-parallel (has K_4 minor)
let mut g = Graph::with_vertices(4);
for i in 0..4u32 {
    for j in (i+1)..4 {
        g.add_edge(i, j).unwrap();
    }
}
assert!(!is_series_parallel(&g).unwrap());