Spanning tree that minimizes a dynamic 'metric?

Here's one insight - cars will never pass through an articulation point, so you can break the graph up into its blocks and solve for each block separately (the minimum overall cost function is the sum of the minimum cost for each block).

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.