Question: The adjacency - list model for directed graphs is well - optimized for many operations. Deletion of a vertex is not one of them. Consider

The adjacency

-

list model for directed graphs is well

-

optimized for many operations.

Deletion of a vertex is not one of them. Consider a directed graph represented using the adjacency list model, implemented using linked lists of destinations with heads referenced by

the source vertices. Analyze the time required to delete a vertex from this graph. Give at least two ways this time could be improved

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