Cost Distribution

There are $N$ towns connected by $M$ **bidirectional** roads. There is **at least one** path between each pair of towns and no pair of towns are directly connected by more than one road. Under a new law, all roads need to be improved. The cost of improving a road can be determined as $C\times L$, where: - $C$ is the number of pairs of towns that would be unable to trade if this road were damag