P377: Enumeration of all topological sortings of a po set

P377: Enumeration of all topological sortings of a po set

Input:

A partial order set $P$.

Output:

All topological sortings of $P$.

Complexity:

$O(|P|)$ time per solution.

Comment:

$|P|$ is the number of objects in $P$.

Reference:

[Varol1981] (Bibtex)