private static int PrintPath(MatrixNode node)
{
if (node == null)
{
return(0);
}
var jump = PrintPath(node.Parent);
Console.Write($"({node.X},{node.Y}) ");
return(jump + 1);
}
public static void Driver()
{
int[,] matrix =
{
{ 4, 4, 6, 5, 5, 1, 1, 1, 7, 4 },
{ 3, 6, 2, 4, 6, 5, 7, 2, 6, 6 },
{ 1, 3, 6, 1, 1, 1, 7, 1, 4, 5 },
{ 7, 5, 6, 3, 1, 3, 3, 1, 1, 7 },
{ 3, 4, 6, 4, 7, 2, 6, 5, 4, 4 },
{ 3, 2, 5, 1, 2, 5, 1, 2, 3, 4 },
{ 4, 2, 2, 2, 5, 2, 3, 7, 7, 3 },
{ 7, 2, 4, 3, 5, 2, 2, 3, 6, 3 },
{ 5, 1, 4, 2, 6, 4, 6, 7, 3, 7 },
{ 1, 4, 1, 7, 5, 3, 6, 5, 3, 4 }
};
int ROW = matrix.GetLength(0);
int COL = matrix.GetLength(1);
int sourceX = 0;
int sourceY = 0;
int destX = 9;
int destY = 9;
bool[,] visited = new bool[ROW, COL];
MatrixNode node = null;
for (int row = 0; row < ROW; row++)
{
for (int col = 0; col < COL; col++)
{
if (row == sourceX && sourceY == col)
{
node = FindShortestPath(matrix, sourceX, sourceY, destX, destY, visited);
}
}
}
if (node == null)
{
Console.WriteLine("Destination node cannot be reached");
}
else
{
var jumps = PrintPath(node) - 1;
Console.WriteLine("\nTotal jumps from source to destination is : " + jumps);
}
}
private static MatrixNode FindShortestPath(int[,] matrix, int sourceX, int sourceY, int destX, int destY, bool[,] visited)
{
int[] ROWS = { 0, 0, -1, 1 };
int[] COLS = { -1, 1, 0, 0 };
var sourceNode = new MatrixNode(sourceX, sourceY, null);
Queue <MatrixNode> queue = new Queue <MatrixNode>();
queue.Enqueue(sourceNode);
while (queue.Count != 0)
{
var currentNode = queue.Dequeue();
int currentX = currentNode.X;
int currentY = currentNode.Y;
if (currentX == destX && currentY == destY)
{
return(currentNode);
}
for (int i = 0; i < 4; i++)
{
int currentValue = matrix[currentX, currentY];
int nextX = currentX + (ROWS[i] * currentValue);
int nextY = currentY + (COLS[i] * currentValue);
if (IsSafeAndValid(matrix, nextX, nextY, visited))
{
visited[nextX, nextY] = true;
var nextNode = new MatrixNode(nextX, nextY, currentNode);
queue.Enqueue(nextNode);
}
}
}
return(null);
}
public MatrixNode(int x, int y, MatrixNode parent)
{
X = x;
Y = y;
Parent = parent;
}
