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A vertex u in a directed graph is defined as a black-hole vertex if there is an edge from every other vertex to u,

 

A vertex u in a directed graph is defined as a black-hole vertex if there is an edge from every other vertex to u, and there is no edge from u to any other vertex. Given the adjacency matrix representation G, design an algorithm to decide if G contains a black-hole vertex. Your algorithm should run in O(|V|) time. (The time to load the adjacency matrix does not count towards to the running time.)

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As described in the problem a Black Hole vertex is the one having indegree V1 and outdegree as 0 In ... blur-text-image

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