private IEnumerable <Pair <Cube> > FillOutMinimalCubePair(Pair <Cube> cubes)
{
Cube a = cubes.a,
b = cubes.b;
if (a.Count == 6 && b.Count == 6)
{
yield return(new Pair <Cube> {
a = a, b = b
});
Cube tempA = new Cube(a), tempB = new Cube(b);
if (a.Contains(6) && !a.Contains(9))
{
tempA.Remove(6);
tempA.Add(9);
yield return(new Pair <Cube> {
a = tempA, b = b
});
}
if (b.Contains(6) && !b.Contains(9))
{
tempB.Remove(6);
tempB.Add(9);
yield return(new Pair <Cube> {
a = a, b = tempB
});
}
if (a.Contains(6) && !a.Contains(9) && b.Contains(6) && !b.Contains(9))
{
yield return(new Pair <Cube> {
a = tempA, b = tempB
});
}
yield break;
}
if (a.Count < 6)
{
for (int i = 0; i < 10; i++)
{
if (!a.Contains(i))
{
var tempA = new Cube(a);
tempA.Add(i);
foreach (var cube in FillOutMinimalCubePair(new Pair <Cube> {
a = tempA, b = b
}))
{
yield return(cube);
}
}
}
}
if (b.Count < 6)
{
for (int i = 0; i < 10; i++)
{
if (!b.Contains(i))
{
var tempB = new Cube(b);
tempB.Add(i);
foreach (var cube in FillOutMinimalCubePair(new Pair <Cube> {
a = a, b = tempB
}))
{
yield return(cube);
}
}
}
}
}
//private List<Pair<Cube>> cubePairs = new List<Pair<Cube>>();
private IEnumerable <Pair <Cube> > GenerateMinimalCubes(int square, Cube cube1, Cube cube2)
{
if (cube1.Count > 6 || cube2.Count > 6)
{
yield break;
}
if (square == 9)
{
//cubePairs.Add(new Pair<Cube> { a = cube1, b = cube2 });
yield return(new Pair <Cube> {
a = cube1, b = cube2
});
yield break;
}
var pair = _squares[square];
var newCube11 = new Cube(cube1);
var newCube12 = new Cube(cube1);
var newCube21 = new Cube(cube2);
var newCube22 = new Cube(cube2);
bool anyAdded = false;
// add a to left, b to right
if (!newCube11.Contains(pair.a))
{
newCube11.Add(pair.a);
anyAdded = true;
}
if (!newCube21.Contains(pair.b))
{
newCube21.Add(pair.b);
anyAdded = true;
}
foreach (var cubes in GenerateMinimalCubes(square + 1, newCube11, newCube21))
{
yield return(cubes);
}
// add b to left, c to right
if (!newCube12.Contains(pair.b))
{
newCube12.Add(pair.b);
anyAdded = true;
}
if (!newCube22.Contains(pair.a))
{
newCube22.Add(pair.a);
anyAdded = true;
}
if (anyAdded)
{
foreach (var cubes in GenerateMinimalCubes(square + 1, newCube12, newCube22))
{
yield return(cubes);
}
}
}
