/// <summary>
/// Tries every group against every other group
/// </summary>
private void CombineAll()
{
var hashes = container.GetHashes(); //do I need to copy?
var count = hashes.Count;
for (int first = 0; first < count; first++)
{
for (int second = first + 1; second < count; second++)
{
if (CountdownNumber.CanCombine(hashes[first], hashes[second]))
{
CombineTwoSets(hashes[first], hashes[second]);
}
}
}
}
private void CombineTwoSets(int firstHash, int secondHash)
{
Debug.Assert(CountdownNumber.CanCombine(firstHash, secondHash));
var firstList = container.GetNumbers(firstHash);
var secondList = container.GetNumbers(secondHash);
//pre-allocate results list
var results = new List <CountdownNumber>(3 * firstList.Count * secondList.Count); //3 is the magic number (of operations)
foreach (var n1 in firstList)
{
foreach (var n2 in secondList)
{
foreach (var op in Enum.GetValues(typeof(ComboCountdownNumber.Operation)).Cast <ComboCountdownNumber.Operation>())
{
results.Add(new ComboCountdownNumber(n1, n2, op));
}
}
}
}