Question: The Steiner tree problem is as follows. Given G = ( V , E ) with positive edge weights, and whose vertices are partitioned into

The Steiner tree problem is as follows. Given G =(V, E) with positive edge weights, and whose vertices are partitioned into two sets R (required) and S (Steiner), find a minimum cost tree in G that contains all required vertices. Design a 2-approximation algorithm for the Steiner tree problem.

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