## Question

5.Given a graph with n edges, can one find a minimum Hamiltonian cycle (TSP) in polynomial time? Has anyone ever proved that a polynomial time algorithm does not exist for this problem? Explain your answers and show the graph. Hint: Consider NP complete problems.

6.Offer one example of an IT or computer application that can be modeled as the TSP problem. This must be at least one paragraph.

Note. Your calculations and work must be shown.

## Solution Preview

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Problem 6Among the practical applications that can be modeled as TSP problem it can be highlighted the computer wiring problem. This can be formulated in the following way:

For an interface formed by modules (each of these having several pins), it is needed to be known the minimized total wire length such that to avoid signal cross-talk and to improve ease. A given subset of pins must be interconnected and the position of each module is already known.

Now we try to model this as TSP instance. It is considered the subset of pins that must be interconnected being P. It is known the distance between two pins i and j as being cij and H – the complete graph formed on the nodes from the set P and weights cij. Since the wiring path must pass through each node exactly one, the problem of minimizing the wire length is identical with finding the minimum Hamiltonian Path on the provided graph....

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