1 import M4a._

     2 //type Pos = (Int, Int)    // a position on a chessboard 

     3 //type Path = List[Pos]    // a path...a list of positions

     4 

     5 /*

     6 def count_all_tours_urban(dim: Int) = {

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

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

     9 }

    10 */

    11 

    12 def count_all_tours_urban(dim: Int) = {

    13   for (i <- (0 until 3).toList; 

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

    15 }

    16 

    17 

    18 assert(count_all_tours_urban(5) == List(304, 0, 56, 0, 304, 0, 56, 0, 56, 0, 56, 0, 64, 0, 56))

    19