Function tarjan_scc
pub fn tarjan_scc(adj: &[Vec<usize>]) -> Vec<Vec<usize>>Expand description
Strongly-connected components of a directed graph via iterative
Tarjan. Each returned Vec is the node ids of one SCC. A singleton
component is a node on no cycle; a component of size ≥ 2 is a
dependency cycle (tangle).
Tarjan emits components in reverse-topological order; callers that need a stable order should sort.