Question: Given an arbitrary digraph G ( may not be a directed acyclic graph, DAG ) of n vertices and m edges, design an algorithm which

Given an arbitrary digraph G (may not be a directed acyclic graph, DAG) of n vertices
and m edges, design an algorithm which computes a topological order of G if G is a
DAG, otherwise computes a cycle of G, in O(m+n) time, and analyze your algorithm.

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