public Step Fill(Bottle targetBottle)
{
if (IsEmpty() || targetBottle.IsFull())
{
return(null);
}
if (!IsBottle && !targetBottle.IsBottle)
{
return(null);
}
var sourceAmount = Amount();
var targetUllage = targetBottle.Ullage();
if (sourceAmount <= targetUllage)
{
targetBottle.AddWater(sourceAmount);
Empty();
return(new Step(_index, targetBottle._index, sourceAmount));
}
else
{
targetBottle.AddWater(targetUllage);
AddWater(-targetUllage);
return(new Step(_index, targetBottle._index, targetUllage));
}
}
public static List <Tuple <string, int, int> > FindPath(Bottle bottle1, Bottle bottle2, int target, List <Tuple <string, int, int> > path)
{
if (bottle1.Ammount == target || bottle2.Ammount == target)
{
return(path);
}
var bestPath = new List <Tuple <string, int, int> >(path);
var subSteps = Int32.MaxValue;
var bottle1StartAmmount = bottle1.Ammount;
var bottle2StartAmmount = bottle2.Ammount;
//Never fill a bottle if the other is full
if (!bottle2.IsFull() && bottle1.Fill())
{
//Check if we have a duplicate state. Only proceed if we are in a unique state
var ammount1 = bottle1.Ammount;
var ammount2 = bottle2.Ammount;
if (!path.Exists(x => x.Item2 == ammount1 && x.Item3 == ammount2))
{
//Copy path
var subPath = new List <Tuple <string, int, int> >(path);
subPath.Add(new Tuple <string, int, int>("Fill " + bottle1.Name + ". " + bottle1.Name + ": " + bottle1.Ammount + "/" + bottle1.Capacity + ". "
+ bottle2.Name + ": " + bottle2.Ammount + "/" + bottle2.Capacity + ". ", bottle1.Ammount, bottle2.Ammount));
//Continue recursive search
var p = FindPath(bottle1, bottle2, target, subPath);
if (p.Count < subSteps)
{
subSteps = p.Count;
bestPath = p;
}
}
}
//Reset bottles for new branch
bottle1.Ammount = bottle1StartAmmount;
bottle2.Ammount = bottle2StartAmmount;
if (!bottle1.IsFull() && bottle2.Fill())
{
var ammount1 = bottle1.Ammount;
var ammount2 = bottle2.Ammount;
if (!path.Exists(x => x.Item2 == ammount1 && x.Item3 == ammount2))
{
var subPath = new List <Tuple <string, int, int> >(path);
subPath.Add(new Tuple <string, int, int>("Fill " + bottle2.Name + ". " + bottle1.Name + ": " + bottle1.Ammount + "/" + bottle1.Capacity + ". "
+ bottle2.Name + ": " + bottle2.Ammount + "/" + bottle2.Capacity + ". ", bottle1.Ammount, bottle2.Ammount));
var p = FindPath(bottle1, bottle2, target, subPath);
if (p.Count < subSteps)
{
subSteps = p.Count;
bestPath = p;
}
}
}
bottle1.Ammount = bottle1StartAmmount;
bottle2.Ammount = bottle2StartAmmount;
//Never empty a bottle if the other is empty
if (bottle2.Ammount != 0 && bottle1.Pour())
{
var ammount1 = bottle1.Ammount;
var ammount2 = bottle2.Ammount;
if (!path.Exists(x => x.Item2 == ammount1 && x.Item3 == ammount2))
{
var subPath = new List <Tuple <string, int, int> >(path);
subPath.Add(new Tuple <string, int, int>("Pour " + bottle1.Name + ". " + bottle1.Name + ": " + bottle1.Ammount + "/" + bottle1.Capacity + ". "
+ bottle2.Name + ": " + bottle2.Ammount + "/" + bottle2.Capacity + ". ", bottle1.Ammount, bottle2.Ammount));
var p = FindPath(bottle1, bottle2, target, subPath);
if (p.Count < subSteps)
{
subSteps = p.Count;
bestPath = p;
}
}
}
bottle1.Ammount = bottle1StartAmmount;
bottle2.Ammount = bottle2StartAmmount;
if (bottle2.Ammount != 0 && bottle2.Pour())
{
var ammount1 = bottle1.Ammount;
var ammount2 = bottle2.Ammount;
if (!path.Exists(x => x.Item2 == ammount1 && x.Item3 == ammount2))
{
var subPath = new List <Tuple <string, int, int> >(path);
subPath.Add(new Tuple <string, int, int>("Pour " + bottle2.Name + ". " + bottle1.Name + ": " + bottle1.Ammount + "/" + bottle1.Capacity + ". "
+ bottle2.Name + ": " + bottle2.Ammount + "/" + bottle2.Capacity + ". ", bottle1.Ammount, bottle2.Ammount));
var p = FindPath(bottle1, bottle2, target, subPath);
if (p.Count < subSteps)
{
subSteps = p.Count;
bestPath = p;
}
}
}
bottle1.Ammount = bottle1StartAmmount;
bottle2.Ammount = bottle2StartAmmount;
if (bottle1.Transfer(ref bottle2))
{
var ammount1 = bottle1.Ammount;
var ammount2 = bottle2.Ammount;
if (!path.Exists(x => x.Item2 == ammount1 && x.Item3 == ammount2))
{
var subPath = new List <Tuple <string, int, int> >(path);
subPath.Add(new Tuple <string, int, int>("Transfer " + bottle1.Name + " into " + bottle2.Name + ". " + bottle1.Name + ": " + bottle1.Ammount + "/" + bottle1.Capacity + ". "
+ bottle2.Name + ": " + bottle2.Ammount + "/" + bottle2.Capacity + ". ", bottle1.Ammount, bottle2.Ammount));
var p = FindPath(bottle1, bottle2, target, subPath);
if (p.Count < subSteps)
{
subSteps = p.Count;
bestPath = p;
}
}
}
bottle1.Ammount = bottle1StartAmmount;
bottle2.Ammount = bottle2StartAmmount;
if (bottle2.Transfer(ref bottle1))
{
var ammount1 = bottle1.Ammount;
var ammount2 = bottle2.Ammount;
if (!path.Exists(x => x.Item2 == ammount1 && x.Item3 == ammount2))
{
var subPath = new List <Tuple <string, int, int> >(path);
subPath.Add(new Tuple <string, int, int>("Transfer " + bottle2.Name + " into " + bottle1.Name + ". " + bottle1.Name + ": " + bottle1.Ammount + "/" + bottle1.Capacity + ". "
+ bottle2.Name + ": " + bottle2.Ammount + "/" + bottle2.Capacity + ". ", bottle1.Ammount, bottle2.Ammount));
var p = FindPath(bottle1, bottle2, target, subPath);
if (p.Count < subSteps)
{
subSteps = p.Count;
bestPath = p;
}
}
}
return(bestPath);
}
private static void PruneActions(Bottle bottleA, Bottle bottleB, Dictionary<string, Action<Bottle, Bottle>> actions)
{
if (bottleA.IsEmpty())
{
actions.Remove("A -> B, ");
actions.Remove("E(A), ");
}
if (bottleB.IsEmpty())
{
actions.Remove("B -> A, ");
actions.Remove("E(B), ");
}
if (bottleA.IsFull())
{
actions.Remove("B -> A, ");
actions.Remove("F(A), ");
}
if (bottleB.IsFull())
{
actions.Remove("A -> B, ");
actions.Remove("F(B), ");
}
}