Traveling Salesman Problem with Held-Karp Algorithm 🧩

I use the Held-Karp algorithm (https://en.wikipedia.org/wiki/Held%E2%80%93Karp_algorithm) to solve an instance of the traveling salesman problem, taking advantage of Python comprehensions.
I am aware that generators would have been more appropriate in some places, but I didn't want to talk about that yet.