public void CorrectGrayAlgorithm_WhenSequenceLengthIsFour()
{
var grayCode = GrayAlgorithm.GetGrayCode(4).ToArray();
foreach (var code in grayCode)
for (var j = 0; j < code.Length; ++j)
Assert.AreEqual(SecondTestData[j], grayCode[j]);
}
public static void Solve(List <Subject> subjects, int maxWeight)
{
var weight = 0;
var bestCost = 0;
var bestWeight = 0;
var previousBits = BinaryConverter.Expand(BinaryConverter.Convert(0), subjects.Count);
var bestMask = previousBits;
foreach (var currentBits in GrayAlgorithm.GetGrayCode(subjects.Count).Skip(1))
{
var(index, isOne) = GetIndexOfDifference(previousBits, currentBits);
previousBits = currentBits;
if (isOne)
{
weight += subjects[index].Weight;
}
else
{
weight -= subjects[index].Weight;
}
if (weight > maxWeight)
{
continue;
}
var cost = subjects.Where((t, i) => currentBits[i] == 1).Sum(x => x.Cost);
if (cost <= bestCost)
{
continue;
}
bestCost = cost;
bestMask = currentBits;
bestWeight = weight;
}
Console.WriteLine("Max weight: " + bestWeight);
Console.WriteLine("Max cost: " + bestCost);
Console.Write("Using weights: ");
for (var i = 0; i < subjects.Count; i++)
{
if (bestMask[i] == 1)
{
Console.Write(subjects[i].Weight + " ");
}
}
Console.WriteLine();
}
