def create_phase2_edgemerge_table():
"""phase2_edgemerge retrieves the initial phase 2 ud_edges coordinate from the u_edges and d_edges coordinates."""
fname = "phase2_edgemerge"
global u_edges_plus_d_edges_to_ud_edges
c_u = cb.CubieCube()
c_d = cb.CubieCube()
c_ud = cb.CubieCube()
edge_u = [Ed.UR, Ed.UF, Ed.UL, Ed.UB]
edge_d = [Ed.DR, Ed.DF, Ed.DL, Ed.DB]
edge_ud = [Ed.UR, Ed.UF, Ed.UL, Ed.UB, Ed.DR, Ed.DF, Ed.DL, Ed.DB]
if not path.isfile(fname):
cnt = 0
print("creating " + fname + " table...")
u_edges_plus_d_edges_to_ud_edges = ar.array(
'H', [0 for i in range(N_U_EDGES_PHASE2 * N_PERM_4)])
for i in range(N_U_EDGES_PHASE2):
c_u.set_u_edges(i)
for j in range(N_CHOOSE_8_4):
c_d.set_d_edges(j * N_PERM_4)
invalid = False
for e in edge_ud:
c_ud.ep[e] = -1 # invalidate edges
if c_u.ep[e] in edge_u:
c_ud.ep[e] = c_u.ep[e]
if c_d.ep[e] in edge_d:
c_ud.ep[e] = c_d.ep[e]
if c_ud.ep[e] == -1:
invalid = True # edge collision
break
if not invalid:
for k in range(N_PERM_4):
c_d.set_d_edges(j * N_PERM_4 + k)
for e in edge_ud:
if c_u.ep[e] in edge_u:
c_ud.ep[e] = c_u.ep[e]
if c_d.ep[e] in edge_d:
c_ud.ep[e] = c_d.ep[e]
u_edges_plus_d_edges_to_ud_edges[
N_PERM_4 * i + k] = c_ud.get_ud_edges()
cnt += 1
if cnt % 2000 == 0:
print('.', end='', flush=True)
print()
fh = open(fname, "wb")
u_edges_plus_d_edges_to_ud_edges.tofile(fh)
fh.close()
print()
else:
fh = open(fname, "rb")
u_edges_plus_d_edges_to_ud_edges = ar.array('H')
u_edges_plus_d_edges_to_ud_edges.fromfile(fh,
N_U_EDGES_PHASE2 * N_PERM_4)
def run(self):
cb = None
if self.rot == 0: # no rotation
cb = cubie.CubieCube(self.cb_cube.cp, self.cb_cube.co, self.cb_cube.ep, self.cb_cube.eo)
elif self.rot == 1: # conjugation by 120° rotation
cb = cubie.CubieCube(sy.symCube[32].cp, sy.symCube[32].co, sy.symCube[32].ep, sy.symCube[32].eo)
cb.multiply(self.cb_cube)
cb.multiply(sy.symCube[16])
elif self.rot == 2: # conjugation by 240° rotation
cb = cubie.CubieCube(sy.symCube[16].cp, sy.symCube[16].co, sy.symCube[16].ep, sy.symCube[16].eo)
cb.multiply(self.cb_cube)
cb.multiply(sy.symCube[32])
if self.inv == 1: # invert cube
tmp = cubie.CubieCube()
cb.inv_cubie_cube(tmp)
cb = tmp
self.co_cube = coord.CoordCube(cb) # the rotated/inverted cube in coordinate representation
dist = self.co_cube.get_depth_phase1()
for togo1 in range(dist, 20): # iterative deepening, solution has at least dist moves
self.sofar_phase1 = []
self.search(self.co_cube.flip, self.co_cube.twist, self.co_cube.slice_sorted, dist, togo1)
def create_phase1_prun_table():
"""Create/load the flipslice_twist_depth3 pruning table for phase 1."""
global flipslice_twist_depth3
total = defs.N_FLIPSLICE_CLASS * defs.N_TWIST
fname = "phase1_prun"
if not path.isfile(fname):
print("creating " + fname + " table...")
print('This may take half an hour or even longer, depending on the hardware.')
flipslice_twist_depth3 = ar.array('L', [0xffffffff] * (total // 16 + 1))
# #################### create table with the symmetries of the flipslice classes ###############################
cc = cb.CubieCube()
fs_sym = ar.array('H', [0] * defs.N_FLIPSLICE_CLASS)
for i in range(defs.N_FLIPSLICE_CLASS):
if (i + 1) % 1000 == 0:
print('.', end='', flush=True)
rep = sy.flipslice_rep[i]
cc.set_slice(rep // defs.N_FLIP)
cc.set_flip(rep % defs.N_FLIP)
for s in range(defs.N_SYM_D4h):
ss = cb.CubieCube(sy.symCube[s].cp, sy.symCube[s].co, sy.symCube[s].ep,
sy.symCube[s].eo) # copy cube
ss.edge_multiply(cc) # s*cc
ss.edge_multiply(sy.symCube[sy.inv_idx[s]]) # s*cc*s^-1
if ss.get_slice() == rep // defs.N_FLIP and ss.get_flip() == rep % defs.N_FLIP:
fs_sym[i] |= 1 << s
print()
# ##################################################################################################################
fs_classidx = 0 # value for solved phase 1
twist = 0
set_flipslice_twist_depth3(defs.N_TWIST * fs_classidx + twist, 0)
done = 1
depth = 0
backsearch = False
print('depth:', depth, 'done: ' + str(done) + '/' + str(total))
while done != total:
depth3 = depth % 3
if depth == 9:
# backwards search is faster for depth >= 9
print('flipping to backwards search...')
backsearch = True
if depth < 8:
mult = 5 # controls the output a few lines below
else:
mult = 1
idx = 0
for fs_classidx in range(defs.N_FLIPSLICE_CLASS):
if (fs_classidx + 1) % (200 * mult) == 0:
print('.', end='', flush=True)
if (fs_classidx + 1) % (16000 * mult) == 0:
print('')
twist = 0
while twist < defs.N_TWIST:
# ########## if table entries are not populated, this is very fast: ################################
if not backsearch and idx % 16 == 0 and flipslice_twist_depth3[idx // 16] == 0xffffffff \
and twist < defs.N_TWIST - 16:
twist += 16
idx += 16
continue
####################################################################################################
if backsearch:
match = (get_flipslice_twist_depth3(idx) == 3)
else:
match = (get_flipslice_twist_depth3(idx) == depth3)
if match:
flipslice = sy.flipslice_rep[fs_classidx]
flip = flipslice % 2048 # defs.N_FLIP = 2048
slice_ = flipslice >> 11 # // defs.N_FLIP
for m in enums.Move:
twist1 = mv.twist_move[18 * twist + m] # defs.N_MOVE = 18
flip1 = mv.flip_move[18 * flip + m]
slice1 = mv.slice_sorted_move[432 * slice_ + m] // 24 # defs.N_PERM_4 = 24, 18*24 = 432
flipslice1 = (slice1 << 11) + flip1
fs1_classidx = sy.flipslice_classidx[flipslice1]
fs1_sym = sy.flipslice_sym[flipslice1]
twist1 = sy.twist_conj[(twist1 << 4) + fs1_sym]
idx1 = 2187 * fs1_classidx + twist1 # defs.N_TWIST = 2187
if not backsearch:
if get_flipslice_twist_depth3(idx1) == 3: # entry not yet filled
set_flipslice_twist_depth3(idx1, (depth + 1) % 3)
done += 1
# ####symmetric position has eventually more than one representation ###############
sym = fs_sym[fs1_classidx]
if sym != 1:
for j in range(1, 16):
sym >>= 1
if sym % 2 == 1:
twist2 = sy.twist_conj[(twist1 << 4) + j]
# fs2_classidx = fs1_classidx due to symmetry
idx2 = 2187 * fs1_classidx + twist2
if get_flipslice_twist_depth3(idx2) == 3:
set_flipslice_twist_depth3(idx2, (depth + 1) % 3)
done += 1
####################################################################################
else: # backwards search
if get_flipslice_twist_depth3(idx1) == depth3:
set_flipslice_twist_depth3(idx, (depth + 1) % 3)
done += 1
break
twist += 1
idx += 1 # idx = defs.N_TWIST * fs_class + twist
depth += 1
print()
print('depth:', depth, 'done: ' + str(done) + '/' + str(total))
fh = open(fname, "wb")
flipslice_twist_depth3.tofile(fh)
else:
print("loading " + fname + " table...")
fh = open(fname, "rb")
flipslice_twist_depth3 = ar.array('L')
flipslice_twist_depth3.fromfile(fh, total // 16 + 1)
fh.close()
def create_phase2_prun_table():
"""Create/load the corners_ud_edges_depth3 pruning table for phase 2."""
total = defs.N_CORNERS_CLASS * defs.N_UD_EDGES
fname = "phase2_prun"
global corners_ud_edges_depth3
if not path.isfile(fname):
print("creating " + fname + " table...")
corners_ud_edges_depth3 = ar.array('L', [0xffffffff] * (total // 16))
# ##################### create table with the symmetries of the corners classes ################################
cc = cb.CubieCube()
c_sym = ar.array('H', [0] * defs.N_CORNERS_CLASS)
for i in range(defs.N_CORNERS_CLASS):
if (i + 1) % 1000 == 0:
print('.', end='', flush=True)
rep = sy.corner_rep[i]
cc.set_corners(rep)
for s in range(defs.N_SYM_D4h):
ss = cb.CubieCube(sy.symCube[s].cp, sy.symCube[s].co, sy.symCube[s].ep,
sy.symCube[s].eo) # copy cube
ss.corner_multiply(cc) # s*cc
ss.corner_multiply(sy.symCube[sy.inv_idx[s]]) # s*cc*s^-1
if ss.get_corners() == rep:
c_sym[i] |= 1 << s
print()
################################################################################################################
c_classidx = 0 # value for solved phase 2
ud_edge = 0
set_corners_ud_edges_depth3(defs.N_UD_EDGES * c_classidx + ud_edge, 0)
done = 1
depth = 0
print('depth:', depth, 'done: ' + str(done) + '/' + str(total))
while depth < 10: # we fill the table only do depth 9 + 1
depth3 = depth % 3
idx = 0
mult = 2
if depth > 9:
mult = 1
for c_classidx in range(defs.N_CORNERS_CLASS):
if (c_classidx + 1) % (20 * mult) == 0:
print('.', end='', flush=True)
if (c_classidx + 1) % (1600 * mult) == 0:
print('')
ud_edge = 0
while ud_edge < defs.N_UD_EDGES:
# ################ if table entries are not populated, this is very fast: ##########################
if idx % 16 == 0 and corners_ud_edges_depth3[idx // 16] == 0xffffffff \
and ud_edge < defs.N_UD_EDGES - 16:
ud_edge += 16
idx += 16
continue
####################################################################################################
if get_corners_ud_edges_depth3(idx) == depth3:
corner = sy.corner_rep[c_classidx]
# only iterate phase 2 moves
for m in (enums.Move.U1, enums.Move.U2, enums.Move.U3, enums.Move.R2, enums.Move.F2,
enums.Move.D1, enums.Move.D2, enums.Move.D3, enums.Move.L2, enums.Move.B2):
ud_edge1 = mv.ud_edges_move[18 * ud_edge + m]
corner1 = mv.corners_move[18 * corner + m]
c1_classidx = sy.corner_classidx[corner1]
c1_sym = sy.corner_sym[corner1]
ud_edge1 = sy.ud_edges_conj[(ud_edge1 << 4) + c1_sym]
idx1 = 40320 * c1_classidx + ud_edge1 # N_UD_EDGES = 40320
if get_corners_ud_edges_depth3(idx1) == 3: # entry not yet filled
set_corners_ud_edges_depth3(idx1, (depth + 1) % 3) # depth + 1 <= 10
done += 1
# ######symmetric position has eventually more than one representation #############
sym = c_sym[c1_classidx]
if sym != 1:
for j in range(1, 16):
sym >>= 1
if sym % 2 == 1:
ud_edge2 = sy.ud_edges_conj[(ud_edge1 << 4) + j]
# c1_classidx does not change
idx2 = 40320 * c1_classidx + ud_edge2
if get_corners_ud_edges_depth3(idx2) == 3:
set_corners_ud_edges_depth3(idx2, (depth + 1) % 3)
done += 1
####################################################################################
ud_edge += 1
idx += 1 # idx = defs.N_UD_EDGEPERM * corner_classidx + ud_edge
depth += 1
print()
print('depth:', depth, 'done: ' + str(done) + '/' + str(total))
print('remaining unfilled entries have depth >=11')
fh = open(fname, "wb")
corners_ud_edges_depth3.tofile(fh)
else:
print("loading " + fname + " table...")
fh = open(fname, "rb")
corners_ud_edges_depth3 = ar.array('L')
corners_ud_edges_depth3.fromfile(fh, total // 16)
fh.close()
# ################### Movetables describe the transformation of the coordinates by cube moves. #########################
from os import path
import array as ar
import marcs.TwoPhaseSolver.cubie as cb
import marcs.TwoPhaseSolver.enums
from marcs.TwoPhaseSolver.defs import N_TWIST, N_FLIP, N_SLICE_SORTED, N_CORNERS, N_UD_EDGES, N_MOVE
a = cb.CubieCube()
# ######################################### Move table for the twists of the corners. ##################################
# The twist coordinate describes the 3^7 = 2187 possible orientations of the 8 corners
# 0 <= twist < 2187 in phase 1, twist = 0 in phase 2
fname = "move_twist"
if not path.isfile(fname):
print("creating " + fname + " table...")
twist_move = ar.array('H', [0 for i in range(N_TWIST * N_MOVE)])
for i in range(N_TWIST):
a.set_twist(i)
for j in enums.Color: # six faces U, R, F, D, L, B
for k in range(3): # three moves for each face, for example U, U2, U3 = U'
a.corner_multiply(cb.basicMoveCube[j])
twist_move[N_MOVE * i + 3 * j + k] = a.get_twist()
a.corner_multiply(cb.basicMoveCube[j]) # 4. move restores face
fh = open(fname, "wb")
twist_move.tofile(fh)
else:
print("loading " + fname + " table...")
fh = open(fname, "rb")
twist_move = ar.array('H')
twist_move.fromfile(fh, N_TWIST * N_MOVE)
epROT_U4 = [
Ed.UB, Ed.UR, Ed.UF, Ed.UL, Ed.DB, Ed.DR, Ed.DF, Ed.DL, Ed.BR, Ed.FR,
Ed.FL, Ed.BL
]
eoROT_U4 = [0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1]
# reflection at the plane through the U, D, F, B centers
cpMIRR_LR2 = [Co.UFL, Co.URF, Co.UBR, Co.ULB, Co.DLF, Co.DFR, Co.DRB, Co.DBL]
coMIRR_LR2 = [3, 3, 3, 3, 3, 3, 3, 3]
epMIRR_LR2 = [
Ed.UL, Ed.UF, Ed.UR, Ed.UB, Ed.DL, Ed.DF, Ed.DR, Ed.DB, Ed.FL, Ed.FR,
Ed.BR, Ed.BL
]
eoMIRR_LR2 = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
basicSymCube = [cb.CubieCube()] * 4
basicSymCube[BS.ROT_URF3] = cb.CubieCube(cpROT_URF3, coROT_URF3, epROT_URF3,
eoROT_URF3)
basicSymCube[BS.ROT_F2] = cb.CubieCube(cpROT_F2, coROT_F2, epROT_F2, eoROT_F2)
basicSymCube[BS.ROT_U4] = cb.CubieCube(cpROT_U4, coROT_U4, epROT_U4, eoROT_U4)
basicSymCube[BS.MIRR_LR2] = cb.CubieCube(cpMIRR_LR2, coMIRR_LR2, epMIRR_LR2,
eoMIRR_LR2)
# ######################################################################################################################
# ######################################## Fill SymCube list ###########################################################
# 48 CubieCubes will represent the 48 cube symmetries
symCube = []
cc = cb.CubieCube() # Identity cube
idx = 0
for urf3 in range(3):