private static void SackTest()
{
Sack sack = new Sack(4);
var item1 = new Sword();
var item2 = new Potion();
sack.AddItem(item1);
sack.AddItem(item2);
sack.DisplayContents();
Console.ReadLine();
}
public ISack <T> Solve(IList <IItem <T> > items, long maxWeight)
{
var resultMatrix = new TwoDimensionalMatrix <long>();
var keepMatrix = new TwoDimensionalMatrix <bool>();
var itemCount = items.Count;
for (var i = 1; i <= itemCount; i++)
{
var weightAtIndex = items[i - 1].Weight;
var valueAtIndex = items[i - 1].Value;
for (var w = 0; w <= maxWeight; w++)
{
var newValue = valueAtIndex + resultMatrix[i - 1, w - weightAtIndex];
var oldValue = resultMatrix[i - 1, w];
if (weightAtIndex <= w && newValue > oldValue)
{
resultMatrix[i, w] = newValue;
keepMatrix[i, w] = true;
}
else
{
resultMatrix[i, w] = oldValue;
}
}
}
var defaultSack = new Sack <T>(maxWeight);
var upperBound = maxWeight;
for (var i = items.Count; i > 0; i--)
{
if (keepMatrix[i, upperBound])
{
defaultSack.AddItem(items[i - 1]);
upperBound -= items[i - 1].Weight;
}
}
return(defaultSack);
}
