public Board(Board newState)
{
this.board = (char[,])newState.board.Clone();
//this.board = newState.board;
this.width = newState.width;
this.height = newState.height;
}
public void AddChild(Board newState, string lastMove)
{
Vertice child = new Vertice(newState, lastMove);
child.parent = this;
child.level = this.level + 1;
children.Add(child);
}
public static void Main(string[] args)
{
int outputMode = int.Parse(Console.ReadLine ());
int boardHeight = int.Parse(Console.ReadLine ());
int yTarget = int.Parse (Console.ReadLine ());
int xTarget = int.Parse (Console.ReadLine ());
string[] lines = new string[boardHeight];
for (int i = 0; i < boardHeight; i++) {
lines [i] = Console.ReadLine ();
}
int boardWidth = lines [0].Length;
Board board = new Board (boardWidth, boardHeight, lines);
int amountOfRuns = 100;
System.Diagnostics.Stopwatch sw = new System.Diagnostics.Stopwatch();
sw.Start();
for (int i = 0; i < amountOfRuns; i++)
{
new Solver(board, xTarget, yTarget, outputMode);
}
sw.Stop();
Console.WriteLine("On average time in ms: " + sw.ElapsedMilliseconds / amountOfRuns);
Console.ReadKey();
}
public Solver(Board rootBoard, int xTarget, int yTarget, int outputMode)
{
boardWidth = rootBoard.width;
boardHeight = rootBoard.height;
Hashtable HashTable = new Hashtable();
root = new Vertice(rootBoard, null);
HashTable.Add(rootBoard.Hash(), rootBoard);
syncHT = Hashtable.Synchronized(HashTable);
queue = new ConcurrentQueue<Vertice>();
queue.Enqueue(root);
solve(xTarget, yTarget, outputMode);
}
private bool isVisitedState(Board newState)
{
bool test = syncHT.ContainsKey(newState.Hash());
return test;
}
/// <summary>
/// "Moves the car to the given position.
/// </summary>
/// <param name="car">Char to id the car</param>
/// <param name="oldTopLeftCorner">[0] = x, [1] = y</param>
/// <param name="oldBottomRightCorner">[0] = x, [1] = y</param>
/// <param name="newTopLeftCorner">[0] = x, [1] = y</param>
/// <param name="newBottomRightCorner">[0] = x, [1] = y</param>
/// <returns>The board after the move</returns>
private Board createNewState(Board board, char car, int[] oldTopLeftCorner, int[] oldBottomRightCorner,
int[] newTopLeftCorner, int[] newBottomRightCorner)
{
Board result = new Board(board);
//Console.WriteLine(result);
int x = oldTopLeftCorner[0];
int y = oldTopLeftCorner[1];
//Remove the old car
//Do we move NS || WE
bool goesVertical = (x == oldBottomRightCorner[0]);
if (goesVertical)
{
// HORI +1
//empty the spot the car used to be
for (int i = y; i < oldBottomRightCorner[1] + 1; i++)
result.board[x, i] = '.';
}
else
{
for (int i = x; i < oldBottomRightCorner[0] + 1; i++)
result.board[i, y] = '.';
}
//Draw the car on it's new spot. :)
x = newTopLeftCorner[0];
y = newTopLeftCorner[1];
if (goesVertical)
{
for(int i = y; i < newBottomRightCorner[1] + 1; i++)
result.board[x, i] = car;
}
else
{
for (int i = x; i < newBottomRightCorner[0] + 1; i++)
result.board[i, y] = car;
}
return result;
}
/// <summary>
/// For the state given, return all the possible moves.
/// </summary>
/// <param name="currentState">From which state to check</param>
/// <returns>Unvisited states which can be got to in 1 move</returns>
private List<Vertice> allPossibleMoves(Board currentState)
{
List<Vertice> result = new List<Vertice>();
List<char> checkedCars = new List<char>();
for (int y = 0; y < this.boardHeight; y++)
for (int x = 0; x < this.boardWidth; x++)
{
char car = currentState.board[x, y];
//Is there a car at the current spot.
//Or have we cheched this car already?
if (car == '.' || checkedCars.Contains(car))
continue;
//Console.WriteLine("Checking: " + car);
//What direction does the car go? NS || WE
//Console.WriteLine("x = " + x + " car = " + car + currentState.board[x + 1, y]);
if (x+1 < this.boardWidth && currentState.board[x+1,y] == car)
{
//Console.WriteLine("Horizontal");
//Horizontal moving
//Grab position of the car
int[] oldTopLeftCorner = {x,y};
int endCar = x + 1;
while(endCar + 1 < this.boardWidth && currentState.board[endCar + 1, y] == car)
endCar++;
int[] oldBottomRightCorner = { endCar, y };
//Scan left and right for open position, for each position open
//we create a new vertice.
// Xy
for (int i = x - 1; i >= 0; i--)
{
//Console.WriteLine("Horizontal-LEFT");
if (currentState.board[i, y] != '.')
break;
int stepstaken = oldTopLeftCorner[0] - i;
//Create new Board
int[] newTopLeftCorner = {i, y};
int[] newBottomRightCorner = { endCar - stepstaken, y};
Board newBoard = createNewState(currentState, car,
oldTopLeftCorner, oldBottomRightCorner,
newTopLeftCorner, newBottomRightCorner);
if (!isVisitedState(newBoard))
{
Vertice vResult = new Vertice(newBoard, car + "l" + stepstaken);
//Console.WriteLine(vResult);
result.Add(vResult);
syncHT.Add(newBoard.Hash(), newBoard);
}
}
//Now scan right of the car
for (int i = endCar + 1; i < this.boardWidth; i++)
{
//Console.WriteLine("Horizontal-RIGHT");
if (currentState.board[i, y] != '.')
break;
int stepstaken = i - oldBottomRightCorner[0];
int[] newTopLeftCorner = { x + stepstaken, y };
int[] newBottomRightCorner = { endCar + stepstaken, y };
//Console.WriteLine("" + newTopLeftCorner[0] + newTopLeftCorner[1]);
//Console.WriteLine("" + newBottomRightCorner[0] + newBottomRightCorner[1]);
Board newBoard = createNewState(currentState, car,
oldTopLeftCorner, oldBottomRightCorner,
newTopLeftCorner, newBottomRightCorner);
if (!isVisitedState(newBoard))
{
Vertice vResult = new Vertice(newBoard, car + "r" + stepstaken);
//Console.WriteLine(vResult);
result.Add(vResult);
syncHT.Add(newBoard.Hash(), newBoard);
}
}
}
else
{
//Console.WriteLine("Vertical");
//Set the old positions
int[] oldTopLeftCorner = { x, y };
int endCar = y + 1;
while (endCar + 1 < this.boardHeight && currentState.board[x, endCar + 1] == car)
endCar++;
int[] oldBottomRightCorner = { x, endCar };
//Console.WriteLine("" + oldTopLeftCorner[0] + oldTopLeftCorner[1]);
//Console.WriteLine("" + oldBottomRightCorner[0] + oldBottomRightCorner[1]);
//Now look up and down for the all moves
//Looking up here
for (int i = y - 1; i >= 0; i--)
{
//Console.WriteLine("Vertical-UP");
//Console.WriteLine(currentState);
//Console.WriteLine("Vertical-UP");
if (currentState.board[x, i] != '.')
break;
int stepstaken = oldTopLeftCorner[1] - i;
//Create new Board
int[] newTopLeftCorner = { x, i };
int[] newBottomRightCorner = { x, endCar - stepstaken };
//Console.WriteLine("" + newTopLeftCorner[0] + newTopLeftCorner[1]);
//Console.WriteLine("" + newBottomRightCorner[0] + newBottomRightCorner[1]);
Board newBoard = createNewState(currentState, car,
oldTopLeftCorner, oldBottomRightCorner,
newTopLeftCorner, newBottomRightCorner);
//Console.WriteLine(newBoard);
if (!isVisitedState(newBoard))
{
Vertice vResult = new Vertice(newBoard, car + "u" + stepstaken);
//Console.WriteLine(vResult);
result.Add(vResult);
syncHT.Add(newBoard.Hash(), newBoard);
}
//Console.WriteLine("Vertical-UP");
//Console.WriteLine(currentState);
//Console.WriteLine("Vertical-UP");
}
//Now scan below the car
for (int i = endCar + 1; i < this.boardHeight; i++)
{
//Console.WriteLine("Vertical-DOWN");
//Console.WriteLine("Vertical-DOWN: " + i);
//Console.WriteLine("Vertical-DOWN: " + currentState.board[x, i]);
if (currentState.board[x, i] != '.')
break;
int stepstaken = i - oldBottomRightCorner[1];
int[] newTopLeftCorner = { x, y + stepstaken };
int[] newBottomRightCorner = { x, endCar + stepstaken };
//Console.WriteLine("" + newTopLeftCorner[0] + newTopLeftCorner[1]);
//Console.WriteLine("" + newBottomRightCorner[0] + newBottomRightCorner[1]);
Board newBoard = createNewState(currentState, car,
oldTopLeftCorner, oldBottomRightCorner,
newTopLeftCorner, newBottomRightCorner);
if (!isVisitedState(newBoard))
{
//Console.WriteLine("New Board added");
Vertice vResult = new Vertice(newBoard, car + "d" + stepstaken);
//Console.WriteLine(vResult);
result.Add(vResult);
syncHT.Add(newBoard.Hash(), newBoard);
}
}
}
//Console.ReadKey();
//Console.WriteLine("");
checkedCars.Add(car);
}
return result;
}
public Vertice(Board board, string lastmove)
{
this.state = board;
this.lastMove = lastmove;
}