The reverse of a directed graph G = (V,E) is another directed graph G^R = (V,E^R) on the same vertex set, but with all edges reversed; that is, E^R = {(v, u) : (u, v) ∈ E}. Give a linear-time algorithm for computing the reverse of a graph in adjacency list format.

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Strongly Connected Components

 A directed graph in which a path exists between all its pairs of vertices is called a strongly connected graph. A portion of the strongly connected directed graph that contains a path to reach from each vertex to other vertices is called a strongly connected component (SCC).