Method from

src/graph/directed/digraph.rs:47–54

(nv: usize)

/// create a V-vertex graph with no edges
impl From<usize> for Digraph {
    fn from(nv: usize) -> Self {
        let mut adj = Vec::with_capacity(nv);
        for _ in 0..nv {
            adj.push(LinkedList::default());
        }

        Self { nv, ne: 0, adj }
    }
}

impl From<&str> for Digraph {