private int Step(Grid2D <int> grid)
{
int flashes = 0;
var toFlash = new Queue <Point>();
foreach (var p in grid.CoordEnumerable())
{
grid.SetValueAt(p, grid.ValueAt(p) + 1);
if (grid.ValueAt(p) == 10)
{
toFlash.Enqueue(p);
}
}
while (toFlash.Count > 0)
{
var flashPoint = toFlash.Dequeue();
foreach (var adjacent in grid.AdjacentPoints(flashPoint, Grid2D.allNeighbours))
{
if (grid.ValueAt(adjacent) > 0)
{
grid.SetValueAt(adjacent, grid.ValueAt(adjacent) + 1);
if (grid.ValueAt(adjacent) == 10)
{
toFlash.Enqueue(adjacent);
}
}
}
flashes++;
grid.SetValueAt(flashPoint, 0);
}
return(flashes);
}