The reverse of a directed graph G = (V, E) is another directed graph GR = (V, ER) on the same vertex set, but with all edges reversed; that is, ER = {(v, u) where (u, v) belongs to E}. Give an algorithm for computing the reverse of a graph in adjacency list format. You may assume that the vertices are integers 1 to N. Specify its space and time complexity.

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