Function petgraph::algo::all_simple_paths

pub fn all_simple_paths<TargetColl, G>(
    graph: G, 
    from: G::NodeId, 
    to: G::NodeId, 
    min_intermediate_nodes: usize, 
    max_intermediate_nodes: Option<usize>
) -> impl Iterator<Item = TargetColl> where
    G: NodeCount,
    G: IntoNeighborsDirected,
    G::NodeId: Eq + Hash,
    TargetColl: FromIterator<G::NodeId>, 

Returns iterator that produces all simple paths from from node to to, which contains at least min_intermediate_nodes nodes and at most max_intermediate_nodes, if given, limited by graph's order otherwise Simple path is path without repetitions Algorithm is adopted from https://networkx.github.io/documentation/stable/reference/algorithms/generated/networkx.algorithms.simple_paths.all_simple_paths.html

Example

use petgraph::{algo, prelude::*};

let mut graph = DiGraph::<&str, i32>::new();

let a = graph.add_node("a");
let b = graph.add_node("b");
let c = graph.add_node("c");
let d = graph.add_node("d");

graph.extend_with_edges(&[(a, b, 1), (b, c, 1), (c, d, 1), (a, b, 1), (b, d, 1)]);

let ways = algo::all_simple_paths::<Vec<_>, _>(&graph, a, d, 0, None)
  .collect::<Vec<_>>();

assert_eq!(4, ways.len());