diff -r a359976a6f3e -r 975d34506e88 testing3-bak/knight2b_test.scala --- a/testing3-bak/knight2b_test.scala Mon Dec 10 02:23:30 2018 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,40 +0,0 @@ - -import scala.concurrent._ -import scala.concurrent.duration._ -import ExecutionContext.Implicits.global -import scala.language.postfixOps - -type Pos = (Int, Int) // a position on a chessboard -type Path = List[Pos] // a path...a list of positions - -def add_pair_urban(x: Pos)(y: Pos): Pos = - (x._1 + y._1, x._2 + y._2) - -def is_legal_urban(dim: Int, path: Path)(x: Pos): Boolean = - 0 <= x._1 && 0 <= x._2 && x._1 < dim && x._2 < dim && !path.contains(x) - -def moves_urban(x: Pos): List[Pos] = - List(( 1, 2),( 2, 1),( 2, -1),( 1, -2), - (-1, -2),(-2, -1),(-2, 1),(-1, 2)).map(add_pair_urban(x)) - -def legal_moves_urban(dim: Int, path: Path, x: Pos): List[Pos] = - moves_urban(x).filter(is_legal_urban(dim, path)) - -def correct_urban(dim: Int)(p: Path): Boolean = p match { - case Nil => true - case x::Nil => true - case x::y::p => - if (legal_moves_urban(dim, p, y).contains(x)) correct_urban(dim)(y::p) else false -} - - -lazy val f = Future { - - val ts1 = CW7b.first_tour(8, List((0, 0))).get - assert(correct_urban(8)(ts1) == true) - - val ts2 = CW7b.first_tour(4, List((0, 0))) - assert(ts2 == None) -} - -Await.result(f, 300 second)