Function petgraph::algo::bellman_ford

pub fn bellman_ford<G>(
    g: G, 
    source: G::NodeId
) -> Result<(Vec<G::EdgeWeight>, Vec<Option<G::NodeId>>), NegativeCycle> where
    G: NodeCount + IntoNodeIdentifiers + IntoEdges + NodeIndexable,
    G::EdgeWeight: FloatMeasure, 

[Generic] Compute shortest paths from node source to all other.

Using the Bellman–Ford algorithm; negative edge costs are permitted, but the graph must not have a cycle of negative weights (in that case it will return an error).

On success, return one vec with path costs, and another one which points out the predecessor of a node along a shortest path. The vectors are indexed by the graph's node indices.