public void InverseTest()
{
Random random = new Random(7777777);
int length = 50;
Alg original = Alg.FromString("R U R' F' R U R' U' R' F R2 U' R' U'");
Alg expected = Alg.FromString("U R U R2 F' R U R U' R' F R U' R'");
Alg result = Alg.Inverse(original);
Assert.AreEqual(expected, result);
Alg randomMoves = Alg.FromRandomMoves(length, random);
Assert.AreEqual(randomMoves, Alg.Inverse(Alg.Inverse(randomMoves)));
Assert.AreEqual(randomMoves, randomMoves.Inverse().Inverse());
Assert.AreEqual(randomMoves.Inverse(), Alg.Inverse(randomMoves));
Assert.ThrowsException <ArgumentNullException>(() => Alg.Inverse(null));
}
public void RotateTest()
{
Random random = new Random(7777777);
int length = 50;
Rotation rotation = Rotation.x1;
Alg original = Alg.FromString("B2 D U'");
Alg expected = Alg.FromString("D2 F B'");
Assert.AreEqual(expected, original.Rotate(rotation));
Alg randomMoves = Alg.FromRandomMoves(length, random);
Assert.AreEqual(randomMoves.Inverse(), Alg.Inverse(randomMoves));
Assert.ThrowsException <ArgumentNullException>(() =>
Alg.Rotate(null, rotation));
}
private void SearchPhase2(int cp, int equatorPermutation, int udEdgeOrder, int depth, int remainingMoves, int phase1Length)
{
if (IsTerminated.Value)
{
return;
}
if (remainingMoves == 0 && equatorPermutation == 0) //check if solved
{
Alg solution = Alg.FromEnumerable(_currentPhase1Solution.Take(phase1Length).Concat(_currentPhase2Solution.Take(depth)).Cast <Move>());
for (int i = 0; i < _rotation; i++)
{
solution = solution.Rotate(Rotation.y3).Rotate(Rotation.x3);
}
if (_inversed)
{
solution = solution.Inverse();
}
lock (_lockObject)
{
if (solution.Length < _shortestSolutionLength.Value)
{
_shortestSolutionIndex.Value = _solutions.Count;
_shortestSolutionLength.Value = solution.Length;
}
_solutions.Add(solution);
}
if (solution.Length <= _returnLength)
{
IsTerminated.Value = true;
}
return;
}
//increase depth
foreach (int move in TwoPhaseConstants.Phase2Moves)
{
//prevent two consecutive moves on the same face or two
//consecutive moves on the same axis in the wrong order
if (depth == 0)
{
if (phase1Length > 0)
{
int relation = move / 3 - _currentPhase1Solution[phase1Length - 1] / 3;
if (relation == SameFace || relation == SameAxisInWrongOrder)
{
continue;
}
}
}
else
{
int relation = move / 3 - _currentPhase2Solution[depth - 1] / 3;
if (relation == SameFace || relation == SameAxisInWrongOrder)
{
continue;
}
}
int newCp = TableController.CornerPermutationMoveTable[cp, move];
int newEquatorPermutation = TableController.EquatorPermutationMoveTable[equatorPermutation, move];
int newUdEdgePermutation = TableController.UdEdgeOrderMoveTable[udEdgeOrder, MoveTables.Phase1IndexToPhase2Index[move]];
//prune
int cornerUdPruningIndex = PruningTables.GetPhase2CornerUdPruningIndex(newUdEdgePermutation, newCp);
int cornerUdPruningValue = TableController.Phase2CornerUdPruningTable[cornerUdPruningIndex];
int cornerEquatorPruningIndex = Coordinates.NumEquatorOrders * newCp + newEquatorPermutation;
int cornerEquatorPruningValue = TableController.Phase2CornerEquatorPruningTable[cornerEquatorPruningIndex];
if (Math.Max(cornerUdPruningValue, cornerEquatorPruningValue) > remainingMoves - 1)
{
continue;
}
_currentPhase2Solution[depth] = move;
SearchPhase2(newCp, newEquatorPermutation, newUdEdgePermutation, depth + 1, remainingMoves - 1, phase1Length);
}
}