1 import CW9a._

     2 

     3 def count_all_tours_urban(dim: Int) = {

     4   for (i <- (0 until dim).toList; 

     5        j <- (0 until dim).toList) yield count_tours(dim, List((i, j)))

     6 }

     7 

     8 

     9 assert(count_all_tours_urban(1) == List(1))

    10 assert(count_all_tours_urban(2) == List(0, 0, 0, 0))

    11 assert(count_all_tours_urban(3) == List(0, 0, 0, 0, 0, 0, 0, 0, 0))

    12 assert(count_all_tours_urban(4) == List(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0))

    13 

    14