For the sake of this course,

Is a simple cycle considered a cycle that can repeat both vertices and edges (i.e closed walk)? There are several questions from tests that state 'non simple cycles' are allowed where it seems the intention is closed walks (such as in looking for all vertices that are part of a negative cycle, I assume they mean all vertices that are part of a negative closed walk, since otherwise its quite a difficult problem to fetch them all).

Thanks

Simple cycles