/
solver_2.py
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/
solver_2.py
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import rubik
import time
def hash(a):
h=0
for i in range(0,len(a)):
h=h+a[i]*(24**i)
return h%335923
def search(a,b):
for i in range(0,len(b)):
if a==b[i]:
return True
if i == len(b)-1:
return False
class queue():
def __init__(self,a=None):
self.l=a
def enqueue(self,a):
self.l.append(a)
def isempty(self):
if len(self.l)==0:
return False
else:
return True
def dequeue(self):
if self.isempty():
b=self.l[0]
del(self.l[0])
return b
else:
#print "Queue is empty"
return None
class node():
def __init__(self,li,parent= None,orientation = None):
self.list = li
self.parent = parent
self.orientation = None
self.child=[]
for i in range(0,6):
self.child.append(None)
def shortest_path(start, end):
"""
Using 2-way BFS, finds the shortest path from start_position to
end_position. Returns a list of moves.
You can use the rubik.quarter_twists move set.
Each move can be applied using rubik.perm_apply
"""
if start==end:
return []
startroot=node(start)
endroot=node(end)
startq=queue([startroot,None])
endq=queue([endroot,None])
starth=[]
endh=[]
for i in range(0,335923):
starth.append([])
endh.append([])
startd={}
starth[hash(start)]=(start,None,None)
endd={}
endh[hash(end)]=(end,None,None)
startd[startroot.list]=(startroot.list,startroot.parent,startroot.orientation)
endd[endroot.list]=(endroot.list,endroot.parent,endroot.orientation)
i=0
while i<7:
while True:
g=startq.dequeue()
if g==None:
startq.enqueue(None)
break
if rubik.perm_apply(rubik.F,g.list) is not starth[hash(rubik.perm_apply(rubik.F,g.list))]:
g.child[0]=node(rubik.perm_apply(rubik.F,g.list),g.list,rubik.F)
starth[hash(rubik.perm_apply(rubik.F,g.list))].append((rubik.perm_apply(rubik.F,g.list),g.list,rubik.F))
startq.enqueue(g.child[0])
if rubik.perm_apply(rubik.F,g.list) is endh[hash(rubik.perm_apply(rubik.F,g.list))]:
fr=moves(rubik.perm_apply(rubik.F,g.list),starth)
br=moves(rubik.perm_apply(rubik.F,g.list),endh)
fr.reverse()
z=fr+br
return z
if rubik.perm_apply(rubik.Fi,g.list) is not starth[hash(rubik.perm_apply(rubik.Fi,g.list))]:
g.child[1]=node(rubik.perm_apply(rubik.Fi,g.list),g.list,rubik.Fi)
starth[hash(rubik.perm_apply(rubik.Fi,g.list))].append((rubik.perm_apply(rubik.Fi,g.list),g.list,rubik.Fi))
startq.enqueue(g.child[1])
if rubik.perm_apply(rubik.Fi,g.list) is endh[hash(rubik.perm_apply(rubik.Fi,g.list))]:
fr=moves(rubik.perm_apply(rubik.Fi,g.list),starth)
br=moves(rubik.perm_apply(rubik.Fi,g.list),endh)
fr.reverse()
z=fr+br
return z
if rubik.perm_apply(rubik.L,g.list) is not starth[hash(rubik.perm_apply(rubik.L,g.list))]:
g.child[2]=node(rubik.perm_apply(rubik.L,g.list),g.list,rubik.L)
starth[hash(rubik.perm_apply(rubik.L,g.list))].append((rubik.perm_apply(rubik.L,g.list),g.list,rubik.L))
startq.enqueue(g.child[2])
if rubik.perm_apply(rubik.L,g.list) is endh[hash(rubik.perm_apply(rubik.L,g.list))]:
fr=moves(rubik.perm_apply(rubik.L,g.list),starth)
br=moves(rubik.perm_apply(rubik.L,g.list),endh)
fr.reverse()
z=fr+br
return z
if rubik.perm_apply(rubik.Li,g.list) is not starth[hash(rubik.perm_apply(rubik.Li,g.list))]:
g.child[3]=node(rubik.perm_apply(rubik.Li,g.list),g.list,rubik.Li)
starth[hash(rubik.perm_apply(rubik.Li,g.list))].append((rubik.perm_apply(rubik.Li,g.list),g.list,rubik.Li))
startq.enqueue(g.child[3])
if rubik.perm_apply(rubik.Li,g.list) is endh[hash(rubik.perm_apply(rubik.Li,g.list))]:
fr=moves(rubik.perm_apply(rubik.Li,g.list),starth)
br=moves(rubik.perm_apply(rubik.Li,g.list),endh)
fr.reverse()
z=fr+br
return z
if rubik.perm_apply(rubik.U,g.list) is not starth[hash(rubik.perm_apply(rubik.U,g.list))]:
g.child[4]=node(rubik.perm_apply(rubik.U,g.list),g.list,rubik.U)
starth[hash(rubik.perm_apply(rubik.U,g.list))].append((rubik.perm_apply(rubik.U,g.list),g.list,rubik.U))
startq.enqueue(g.child[4])
if rubik.perm_apply(rubik.U,g.list) is endh[hash(rubik.perm_apply(rubik.U,g.list))]:
fr=moves(rubik.perm_apply(rubik.U,g.list),starth)
br=moves(rubik.perm_apply(rubik.U,g.list),endh)
fr.reverse()
z=fr+br
return z
if rubik.perm_apply(rubik.Ui,g.list) is not starth[hash(rubik.perm_apply(rubik.Ui,g.list))]:
g.child[5]=node(rubik.perm_apply(rubik.Ui,g.list),g.list,rubik.Ui)
starth[hash(rubik.perm_apply(rubik.Ui,g.list))].append((rubik.perm_apply(rubik.Ui,g.list),g.list,rubik.Ui))
startq.enqueue(g.child[5])
if rubik.perm_apply(rubik.Li,g.list) is endh[hash(rubik.perm_apply(rubik.Ui,g.list))]:
fr=moves(rubik.perm_apply(rubik.Ui,g.list),starth)
br=moves(rubik.perm_apply(rubik.Ui,g.list),endh)
fr.reverse()
z=fr+br
return z
while True:
k=endq.dequeue()
if k==None:
endq.enqueue(None)
break
if rubik.perm_apply(rubik.perm_inverse(rubik.F),k.list) is not endh[hash(rubik.perm_apply(rubik.perm_inverse(rubik.F),k.list))]:
k.child[0]=node(rubik.perm_apply(rubik.perm_inverse(rubik.F),k.list),k.list,rubik.F)
endh[hash(rubik.perm_apply(rubik.perm_inverse(rubik.F),k.list))].append((rubik.perm_apply(rubik.perm_inverse(rubik.F),k.list),k.list,rubik.F))
endq.enqueue(k.child[0])
if rubik.perm_apply(rubik.perm_inverse(rubik.F),k.list) is starth[hash(rubik.perm_apply(rubik.perm_inverse(rubik.F),k.list))]:
fr=moves(rubik.perm_apply(rubik.perm_inverse(rubik.F),k.list),starth)
br=moves(rubik.perm_apply(rubik.perm_inverse(rubik.F),k.list),endh)
fr.reverse()
z=fr+br
return z
if rubik.perm_apply(rubik.perm_inverse(rubik.Fi),k.list) is not endh[hash(rubik.perm_apply(rubik.perm_inverse(rubik.Fi),k.list))]:
k.child[1]=node(rubik.perm_apply(rubik.perm_inverse(rubik.Fi),k.list),k.list,rubik.Fi)
endh[hash(rubik.perm_apply(rubik.perm_inverse(rubik.Fi),k.list))]=(rubik.perm_apply(rubik.perm_inverse(rubik.Fi),k.list),k.list,rubik.Fi)
endq.enqueue(k.child[1])
if rubik.perm_apply(rubik.perm_inverse(rubik.Fi),k.list) is startd:
fr=moves(rubik.perm_apply(rubik.perm_inverse(rubik.Fi),k.list),starth)
br=moves(rubik.perm_apply(rubik.perm_inverse(rubik.Fi),k.list),endh)
fr.reverse()
z=fr+br
return z
if rubik.perm_apply(rubik.perm_inverse(rubik.L),k.list) is not endh[hash(rubik.perm_apply(rubik.perm_inverse(rubik.L),k.list))]:
k.child[2]=node(rubik.perm_apply(rubik.perm_inverse(rubik.L),k.list),k.list,rubik.L)
endh[hash(rubik.perm_apply(rubik.perm_inverse(rubik.L),k.list))]=(rubik.perm_apply(rubik.perm_inverse(rubik.L),k.list),k.list,rubik.L)
endq.enqueue(k.child[2])
if rubik.perm_apply(rubik.perm_inverse(rubik.L),k.list) is starth[hash(rubik.perm_apply(rubik.perm_inverse(rubik.L),k.list))]:
fr=moves(rubik.perm_apply(rubik.perm_inverse(rubik.L),k.list),starth)
br=moves(rubik.perm_apply(rubik.perm_inverse(rubik.L),k.list),endh)
fr.reverse()
z=fr+br
return z
if rubik.perm_apply(rubik.perm_inverse(rubik.Li),k.list) is not endh[hash(rubik.perm_apply(rubik.perm_inverse(rubik.Li),k.list))]:
k.child[3]=node(rubik.perm_apply(rubik.perm_inverse(rubik.Li),k.list),k.list,rubik.Li)
endh[hash(rubik.perm_apply(rubik.perm_inverse(rubik.Li),k.list))]=(rubik.perm_apply(rubik.perm_inverse(rubik.Li),k.list),k.list,rubik.Li)
endq.enqueue(k.child[3])
if rubik.perm_apply(rubik.perm_inverse(rubik.Li),k.list) is starth[hash(rubik.perm_apply(rubik.perm_inverse(rubik.Li),k.list))]:
fr=moves(rubik.perm_apply(rubik.perm_inverse(rubik.Li),k.list),starth)
br=moves(rubik.perm_apply(rubik.perm_inverse(rubik.Li),k.list),endh)
fr.reverse()
z=fr+br
return z
if rubik.perm_apply(rubik.perm_inverse(rubik.U),k.list) is not endh[hash(rubik.perm_apply(rubik.perm_inverse(rubik.U),k.list))]:
k.child[4]=node(rubik.perm_apply(rubik.perm_inverse(rubik.U),k.list),k.list,rubik.U)
endh[hash(rubik.perm_apply(rubik.perm_inverse(rubik.U),k.list))]=(rubik.perm_apply(rubik.perm_inverse(rubik.U),k.list),k.list,rubik.U)
endq.enqueue(k.child[4])
if rubik.perm_apply(rubik.perm_inverse(rubik.U),k.list) is starth[hash(rubik.perm_apply(rubik.perm_inverse(rubik.U),k.list))]:
fr=moves(rubik.perm_apply(rubik.perm_inverse(rubik.U),k.list),starth)
br=moves(rubik.perm_apply(rubik.perm_inverse(rubik.U),k.list),endh)
fr.reverse()
z=fr+br
return z
if rubik.perm_apply(rubik.perm_inverse(rubik.Ui),k.list) is not endh[hash(rubik.perm_apply(rubik.perm_inverse(rubik.Ui),k.list))]:
k.child[5]=node(rubik.perm_apply(rubik.perm_inverse(rubik.Ui),k.list),k.list,rubik.Ui)
endh[hash(rubik.perm_apply(rubik.perm_inverse(rubik.Ui),k.list))]=(rubik.perm_apply(rubik.perm_inverse(rubik.Ui),k.list),k.list,rubik.Ui)
endq.enqueue(k.child[5])
if rubik.perm_apply(rubik.perm_inverse(rubik.Ui),k.list) is starth[hash(rubik.perm_apply(rubik.perm_inverse(rubik.Ui),k.list))]:
fr=moves(rubik.perm_apply(rubik.perm_inverse(rubik.Ui),k.list),starth)
br=moves(rubik.perm_apply(rubik.perm_inverse(rubik.Ui),k.list),endh)
fr.reverse()
z=fr+br
return z
i+=1
return None
def moves(start,dicti):
move=[]
i=dicti[hash(start)]
#print i
while i[2] is not None:
move.append(i[2])
if i[1] is not None:
c=i[1]
i=dicti[hash(c)]
return move
end=rubik.I
start=rubik.Fi
print shortest_path(start,end)