shortest path - How to find the least cost to visit every vertex in an undirected, weighted graph at least once starting from a predetermined vertex? -

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The route taken is not to end back to the predefined head. In fact, the travel vendor has a problem that a top can be visited more than once.

Edit: Depending on the maximum of 10,000 characters and edges

its Not sure about, but I think it is optimal (probably not the most effective idea): Calculate the minimum path between each pair of digits, and then apply the travel vendor to this article.

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