Question: Let G be a directed acyclic graph (DAG) with n vertices and m edges. Give an O(n + m)-time algorithm, that takes as input an

  1. Let G be a directed acyclic graph (DAG) with n vertices and m edges. Give an O(n + m)-time algorithm, that takes as input an ordering of the n vertices of G, and checks whether or not this ordering is a topological sorting for G.

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