Topological sort activities: Given a directed graph G = (V, E) where V is a set of activities and E is a set of directed edges. A directed edge < u, v > means activity u has to be done before v. The topological sort is to sort the activities so that the sequence does not violate the precedence relationship. There are cases we cannot topological sort a given graph. (a) Describe the topological sort algorithm. (b) Modify the topological sort algorithm so that it reports the sorted sequence or it reports the graph cannot be sorted.

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