Question: We are given a directed graph G ( V , E ) with vertices { 1 , 2 . . . . , n }

We are given a directed graph G(V, E) with vertices {1,2...., n}, rep-
resented by an n \times n matrix A so that A[i, j]=1 if there is an edge from j to i in E.
Give an algorithm that checks if there is a vertex v so that for every u = v, u 7-> v in E

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