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Given a weighted undirected graph G=(V,E), where the vertex set V is partitioned into K clusters V1,…,VK, the clustered traveling salesman problem is to compute a shortest tour so that all vertices are visited and the vertices of each cluster are visited consecutively. Supposing that no starting and ending vertices of any cluster are specified, we provide a 13/6(≈2.17)-approximation algorithm, and...
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