Question: Let G=(V,E) be a directed graph with n vertices. A vertex s is a drain if, for every v in V except for s, thre

Let G=(V,E) be a directed graph with n vertices. A vertex s is a drain if, for every v in V except for s, thre is an edge from v to s, and there is no edge from s to v. Give an O(n) algorithm to determine whether or not G has a drain assuming that G is given by its n by n adjacency matrix.

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