static void ExpandStateOneBlank(int boxSize, byte[] state, SuccessorList successors)
{
int e = 0;
while (state[e] != 0)
{
e += 1;
}
if (e < (state.Length - boxSize))
{
CreateSuccessor(state, successors.Push(), e, e + boxSize); // down
}
if (e % boxSize < (boxSize - 1))
{
CreateSuccessor(state, successors.Push(), e, e + 1); // right
}
if (e % boxSize > 0)
{
CreateSuccessor(state, successors.Push(), e, e - 1); // left
}
if (e > (boxSize - 1))
{
CreateSuccessor(state, successors.Push(), e, e - boxSize); // up
}
}
