private static long Run(HashSet <MultiDimensionalPosition> initialState)
{
return(Produce.Iterate(initialState, 6, current =>
{
var adjacentCounts = new DictionaryWithDefault <MultiDimensionalPosition, int>(0);
// Look at all active cells and all cells adjacent to active cells
var cells = new HashSet <MultiDimensionalPosition>();
foreach (var position in current)
{
cells.Add(position);
foreach (var pos2 in position.Adjacents())
{
cells.Add(pos2);
adjacentCounts[pos2] += 1;
}
}
var next = cells.Where(position =>
{
var active = current.Contains(position);
return (active && adjacentCounts[position].IsInRange(2, 3)) ||
(!active && adjacentCounts[position] == 3);
}).ToHashSet();
return next;
})
.Count);
}
private static CircularList <int> Run(CircularList <int> initialState, int iterations)
{
var nodeMap = initialState.Walk().ToDictionary(it => it.Value, it => it);
var numberOfCups = nodeMap.Count;
Produce.Iterate(initialState, iterations, state =>
{
var pickedUp = state.Next.Extract(3);
var destination = Modthing(state.Value - 1, numberOfCups);
while (pickedUp.Value == destination || pickedUp.Next.Value == destination || pickedUp.Next.Next.Value == destination)
{
destination = Modthing(destination - 1, numberOfCups);
}
var d = nodeMap[destination];
d.Insert(pickedUp);
return(state.Next);
});
return(nodeMap[1]);
}