def RIGHT(stateNode):
state2 = stateNode.state[:]
space = state2.index(0)
if space != 2 and space != 5 and space != 8:
temp = state2[space + 1]
state2[space] = temp
state2[space + 1] = 0
leafNode = Node(' ')
leafNode.state = state2
leafNode.parent = stateNode
leafNode.move = "Right"
leafNode.distance = -1
return leafNode
else:
return False
def LEFT(stateNode):
state2 = stateNode.state[:]
space = state2.index(0)
if space != 0 and space != 3 and space != 6:
temp = state2[space - 1]
state2[space] = temp
state2[space - 1] = 0
leafNode = Node(' ')
leafNode.state = state2
leafNode.parent = stateNode
leafNode.move = "Left"
leafNode.distance = -1
return leafNode
else:
return False
def DOWN(stateNode):
state2 = stateNode.state[:]
space = state2.index(0)
if space > -1 and space < 6:
temp = state2[space + 3]
state2[space] = temp
state2[space + 3] = 0
leafNode = Node(' ')
leafNode.state = state2
leafNode.parent = stateNode
leafNode.move = "Down"
leafNode.distance = -1
return leafNode
else:
return False
def UP(stateNode):
state2 = stateNode.state[:]
space = state2.index(0)
if space > 2 and space < 9:
temp = state2[space - 3]
state2[space] = temp
state2[space - 3] = 0
leafNode = Node(' ')
leafNode.state = state2
leafNode.parent = stateNode
leafNode.move = "Up"
leafNode.distance = -1
return leafNode
else:
return False
def reConst(goal):
node = goal
stack = Stack()
while node != None:
stack.push(node)
node = node.parent
return stack
start = [1, 2, 3, 4, 6, 8, 7, 5, 0]
n = Node(' ')
n.state = start
n.parent = None
n.move = None
n.distance = -1
goal = [1, 2, 3, 4, 5, 6, 7, 8, 0]
p = Node(' ')
p.state = goal
p.parent = None
p.move = None
p.distance = -1
s = bfs(n, p)
print "Finished"
ss = reConst(s)
ss.pop()
print "Move the space tile in the following order: "
while ss.size():
print ss.pop().move