public BagNode AddBagToTree(string description, List <Tuple <int, string> > containedBags)
{
var bag = FindBag(description, _rootNode);
if (bag == null)
{
bag = new BagNode(description);
// Set doubly linked list to parent bag... may be removed later if we find this isn't a root node
bag.ContainedIn.Add(new Tuple <BagNode, int>(_rootNode, 1));
_rootNode.Contains.Add(new Tuple <BagNode, int>(bag, 1));
}
foreach (var containedBag in containedBags)
{
var newContainedBag = AddBagToTree(containedBag.Item2, new List <Tuple <int, string> >());
// It's possible the bag was already added to the root node
// Need to remove that relationship because it's not a root bag
if (newContainedBag.ContainedIn.Select(x => x.Item1).Contains(_rootNode))
{
// Break the double link for the root node
newContainedBag.ContainedIn.Remove(newContainedBag.ContainedIn.Single(x => x.Item1 == _rootNode));
_rootNode.Contains.Remove(_rootNode.Contains.Single(x => x.Item1 == newContainedBag));
}
// Set doubly linked list to parent bag
bag.Contains.Add(new Tuple <BagNode, int>(newContainedBag, containedBag.Item1));
newContainedBag.ContainedIn.Add(new Tuple <BagNode, int>(bag, containedBag.Item1));
}
return(bag);
}
private BagNode FindBag(string description, BagNode currentBag)
{
if (string.Equals(currentBag.Description, description))
{
return(currentBag);
}
if (currentBag == null || !currentBag.Contains.Any())
{
return(null);
}
var bagsFound = new List <BagNode>();
foreach (var bag in currentBag.Contains.Select(x => x.Item1))
{
var bagFound = FindBag(description, bag);
if (bagFound != null)
{
bagsFound.Add(bagFound);
}
}
return(bagsFound.FirstOrDefault());
}
private static int Part2Recursive(BagNode currentBag)
{
if (!currentBag.Contains.Any())
{
return(0);
}
var totalContainsCount = 0;
foreach (var bag in currentBag.Contains)
{
totalContainsCount += bag.Item2 + (bag.Item2 * Part2Recursive(bag.Item1));
}
return(totalContainsCount);
}
private static List <Guid> Part1Recursive(BagNode currentBag)
{
var idList = new List <Guid>();
// Root bag is fake, and shouldn't count
if (currentBag.Description == "root")
{
return(null);
}
idList.Add(currentBag.Id);
foreach (var parentBag in currentBag.ContainedIn.Select(x => x.Item1))
{
var parentGuids = Part1Recursive(parentBag);
if (parentGuids != null)
{
idList = idList.Concat(parentGuids).ToList();
}
}
return(idList);
}
public BagTree()
{
_rootNode = new BagNode("root");
}
