Question: You are given a directed graph. Design a reasonably efficient algorithm that determines if there exists a walk that goes through each vertex at least

You are given a directed graph.
Design a reasonably efficient algorithm that determines if there exists a walk that goes through each
vertex at least once.
(7 points for reasonably efficient correct high level algorithm description (with correctness proof),5
points for correct time analysis, and 3 points for efficiency of your algorithm.

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