} //End public IDS(puzzle puzzle)
/***************METHODS***************/
public List <Node> doTreeSearch()
{
//Declare variables
int curDepth = 0;
Direction nextMove = Direction.NULL;
//fringe = Insert(Make-Node(Initial-State[problem]), fringe)
this.FirstFiveNodesExpanded.Add(copyState(new int[3, 3], this.originalBoardState));
this.TotalNumNodesExpanded += 1;
while (!PuzzleBoard.isInGoalState())
{
//if fringe is empty then return failure
if (this.OrderedFringe.Count <= 0 && this.Fringe.Count <= 0 && TotalNumNodesExpanded > 1)
{
return(null);
} //End if (curDepth >= maxDepth)
//node = Remove-Front(fringe)
this.Fringe.Clear();
this.Fringe = PuzzleBoard.getMovePositions();
determineNextMove(curDepth);
if (this.OrderedFringe.Count > 0 && this.OrderedFringe[0].DepthWhenFound < curDepth - 1)
{
this.PuzzleBoard = new Puzzle(copyState(new int[3, 3], this.OrderedFringe[0].state));
this.Path = new List <Node>(this.OrderedFringe[0].Path);
} //End if (this.OrderedFringe.Count > 0 && this.OrderedFringe[0].DepthWhenFound < curDepth)
nextMove = this.PuzzleBoard.determineDirection(this.OrderedFringe[0].TileLocation);
//nextMove = determineDirection(this.OrderedFringe[0].TileLocation);
if (nextMove == Direction.NULL)
{
this.PuzzleBoard = new Puzzle(copyState(new int[3, 3], this.OrderedFringe[0].state));
this.PuzzleBoard.setState(this.PuzzleBoard.getReverseDirection(this.OrderedFringe[0].DirUsedToReachTile));
this.Path = new List <Node>(this.OrderedFringe[0].Path);
nextMove = this.PuzzleBoard.determineDirection(this.OrderedFringe[0].TileLocation);
} //End if (nextMove == Direction.NULL)
this.PuzzleBoard.setState(nextMove);
curDepth += 1;
this.TotalNumNodesExpanded += 1;
System.Console.WriteLine("Nodes expanded: " + this.TotalNumNodesExpanded);
this.OrderedFringe.RemoveAt(0);
if (this.FirstFiveNodesExpanded.Count < 5)
{
this.FirstFiveNodesExpanded.Add(copyState(new int[3, 3], this.PuzzleBoard.getPuzzleState()));
} //End if (numNodesExpanded < 5)
this.Path.Add(new Node(this.PuzzleBoard.getPreviousPosition(), this.PuzzleBoard.getTileID(this.PuzzleBoard.getPreviousPosition()), curDepth - 1, this.originalBoardState, nextMove));
//if Goal-Test(problem,State(node)) then return node
if (this.PuzzleBoard.isInGoalState())
{
break;
} //End if (this.PuzzleBoard.isInGoalState())
//fringe = InsertAll(Expand(node, problem), fringe)
if (this.TotalNumNodesExpanded >= 100000)
{
return(null);
} //End if (this.TotalNumNodesExpanded >= 100000)
} //End while (!PuzzleBoard.isInGoalState())
return(this.Path);
} //End public List<Node> doTreeSearch()
} //End public IDS(puzzle puzzle)
/***************METHODS***************/
public List <Node> doTreeSearch()
{
//Declare variables
int maxDepth = 0;
int curDepth = 0;
Direction nextMove = Direction.NULL;
//fringe = Insert(Make-Node(Initial-State[problem]), fringe)
this.Fringe = PuzzleBoard.getMovePositions();
this.FirstFiveNodesExpanded.Add(copyState(new int[3, 3], this.originalBoardState));
maxDepth += 1;
this.TotalNumNodesExpanded += 1;
this.FirstFiveNodesExpanded.Add(copyState(new int[3, 3], this.originalBoardState));
this.TotalNumNodesExpanded += 1;
while (!PuzzleBoard.isInGoalState())
{
//if fringe is empty then return failure
if ((curDepth >= maxDepth && this.OrderedFringe.Count <= 0) || (this.OrderedFringe.Count <= 0 && this.Fringe.Count <= 0))
{
maxDepth += 1;
curDepth = 0;
resetPuzzleBoard();
this.Path.Clear();
this.Fringe.Clear();
this.Fringe = PuzzleBoard.getMovePositions();
this.TotalNumNodesExpanded += 1;
if (this.FirstFiveNodesExpanded.Count < 5)
{
this.FirstFiveNodesExpanded.Add(copyState(new int[3, 3], this.originalBoardState));
} //End if (numNodesExpanded < 5)
continue;
} //End if (curDepth >= maxDepth)
//node = Remove-Front(fringe)
if (curDepth >= maxDepth)
{
if (curDepth > this.OrderedFringe[0].DepthWhenFound)
{
while (curDepth > this.OrderedFringe[0].DepthWhenFound)
{
curDepth -= 1;
this.PuzzleBoard.setState(this.PuzzleBoard.getReverseDirection(this.Path.Last().DirUsedToReachTile));
this.Path.Remove(this.Path.Last());
} //End while (curDepth > this.OrderedFringe[0].DepthWhenFound)
} //End if (curDepth > this.OrderedFringe[0].DepthWhenFound)
} //End if (curDepth >= maxDepth)
determineNextMove(curDepth);
nextMove = this.PuzzleBoard.determineDirection(this.OrderedFringe[0].TileLocation);
//nextMove = determineDirection(this.OrderedFringe[0].TileLocation);
if (nextMove == Direction.NULL)
{
return(null);
} //End if (nextMove == Direction.NULL)
this.PuzzleBoard.setState(nextMove);
curDepth += 1;
this.TotalNumNodesExpanded += 1;
this.OrderedFringe.RemoveAt(0);
if (this.FirstFiveNodesExpanded.Count < 5)
{
this.FirstFiveNodesExpanded.Add(copyState(new int[3, 3], this.PuzzleBoard.getPuzzleState()));
//this.FirstFiveNodesExpanded.Add(this.PuzzleBoard.getTileID(this.PuzzleBoard.getPreviousPosition()));
} //End if (numNodesExpanded < 5)
this.Path.Add(new Node(this.PuzzleBoard.getPreviousPosition(), this.PuzzleBoard.getTileID(this.PuzzleBoard.getPreviousPosition()), curDepth - 1, this.PuzzleBoard.getPuzzleState(), nextMove));
//if Goal-Test(problem,State(node)) then return node
if (this.PuzzleBoard.isInGoalState())
{
break;
} //End if (this.PuzzleBoard.isInGoalState())
//fringe = InsertAll(Expand(node, problem), fringe)
if (curDepth < maxDepth)
{
this.Fringe.Clear();
getTotalMovePositions();
//this.Fringe = PuzzleBoard.getMovePositions();
//this.TotalNumNodesExpanded += this.Fringe.Count;
} //End if (curDepth < maxDepth)
//387420489
if (this.TotalNumNodesExpanded >= 100000)
{
return(null);
} //End if (this.TotalNumNodesExpanded >= 100000)
} //End while (!PuzzleBoard.isInGoalState())
return(this.Path);
} //End public List<Node> doTreeSearch()
