def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
from util import Queue
#creates frontier and root node using getStartState()
#FIFO queue with node as the only element
frontier = Queue()
frontier.push(problem.getStartState())
#holds explored states
explored = set()
#holds final path to take
finalPath = []
#queue to hold next direction to take
nextDirection = Queue()
currState = frontier.pop()
while not problem.isGoalState(currState):
if currState not in explored:
explored.add(currState)
nextState = problem.getSuccessors(currState)
for child, direction, cost in nextState:
frontier.push(child)
currPath = finalPath+[direction]
nextDirection.push(currPath)
currState = frontier.pop()
finalPath = nextDirection.pop()
return finalPath
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
from util import Queue
node = Queue() # contains state that has to be expanded
path_traversed = Queue(
) # Queue to keep record of the directions from start state to current node
traversed = [] # list of nodes that has been visited already
path = [] # the final directions list
ss = problem.getStartState() # start state
node.push(ss)
current_node = node.pop()
while problem.isGoalState(current_node) != True:
if current_node not in traversed:
traversed.append(current_node)
children = problem.getSuccessors(
current_node) # getting successors as tuples
for child, dir, cost in children: # looping over the successors
node.push(child)
temp_path = path + [dir]
path_traversed.push(temp_path)
current_node = node.pop()
path = path_traversed.pop()
print "path", path
return path
util.raiseNotDefined()
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
# util.raiseNotDefined()
from util import Queue
q = Queue()
q2 = Queue()
q2.push([])
q.push([problem.getStartState()])
visited = []
visited.append(problem.getStartState())
if (problem.isGoalState(problem.getStartState())):
return []
x = 1
while (q.isEmpty() == False):
path = q.pop()
path2 = q2.pop()
top = path[-1]
if (problem.isGoalState(top)):
return path2
successors = problem.getSuccessors(top)
for i in range(len(successors)):
if (successors[i][0] not in visited):
# path.append(successors[i][1])
addpath = list(path)
addpath.append(successors[i][0])
addpath2 = list(path2)
addpath2.append(successors[i][1])
q.push(addpath)
q2.push(addpath2)
visited.append(successors[i][0])
# if(problem.isGoalState(successors[i][0])):
# return addpath2
return []
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
from util import Queue
states_to_expand = Queue()
states_to_expand.push(problem.getStartState())
visited_states = []
path_to_goal = []
path_to_current_state = Queue()
current_state = states_to_expand.pop()
flag = 1
while flag == 1:
if problem.isGoalState(current_state):
break
elif current_state not in visited_states:
visited_states.append(current_state)
choices_of_move = problem.getSuccessors(current_state)
for p in range(0, len(choices_of_move)):
choice = choices_of_move[p]
new_position = choice[0]
direction = choice[1]
states_to_expand.push(new_position)
path_to_current_state.push(path_to_goal + [direction])
current_state = states_to_expand.pop()
path_to_goal = path_to_current_state.pop()
return path_to_goal
util.raiseNotDefined()
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
from util import Queue
L = list()
expanded = list()
q = Queue()
direction = list()
current_direction = list()
current_coordinates = problem.getStartState()
while ((problem.isGoalState(current_coordinates)) == False):
for i in problem.getSuccessors(current_coordinates):
direction = current_direction[:]
direction.append(i[1])
if current_coordinates not in expanded:
expanded.append(current_coordinates)
if i[0] not in expanded:
q.push((i[0], direction, i[2]))
current_state = q.pop()
while (current_state[0] in expanded):
current_state = q.pop()
current_coordinates = current_state[0]
current_direction = current_state[1]
L = (current_state[1])
return L
util.raiseNotDefined()
def breadthFirstSearch(problem):
"""
Search the shallowest nodes in the search tree first.
"""
"*** YOUR CODE HERE ***"
#same as DFS but implemented with Queue instead
from util import Queue
openlist = Queue()
#push start state, action, and cost to openlist
state = problem.getStartState()
openlist.push((state, [], 0))
#pop top off and add to closed list
state, totalpath, totalcost = openlist.pop()
closedlist = [state]
isEmpty = False #set to false initially so that we can enter loop
#While not at goal state & not empty, search
while ((not problem.isGoalState(state)) & (not isEmpty)):
#grab successors of current
successors = problem.getSuccessors(state)
#for each successor of current, if not visited,
for succ, action, cost in successors:
#add to open list and visit it immediately cause we visit by level in BFS
if (not succ in closedlist):
openlist.push((succ, totalpath + [action], totalcost + cost))
closedlist.append(succ)
isEmpty = openlist.isEmpty()
state, totalpath, totalcost = openlist.pop()
#repeat
return totalpath
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
from util import Queue
startState = problem.getStartState()
dataStructure = Queue(
) # Use queue as a data structure for breadthFirstSearch
dataStructure.push(
(problem.getStartState(), [], 0)) # push the startState on the queue
node = dataStructure.pop() # process the startState
visited = []
visited.append(node[0]) # put the startState in the list of visited nodes
actions = []
actions = node[1]
cost = node[2]
while not problem.isGoalState(
node[0]): # Loop till we don't reach the goal state
successors = problem.getSuccessors(node[0])
for successor in successors:
if not successor[0] in visited:
# If node has not been visited, then push the node on to the queue
dataStructure.push((successor[0], actions + [successor[1]],
cost + successor[2]))
visited.append(
successor[0]
) # put the node to visited nodes after it has been processed
node = dataStructure.pop()
actions = node[1]
cost = node[2]
return actions
def breadthFirstSearch(problem):
successor_idx = {'dir': 1, 'state': 0, 'cost': -1}
MAX_ITER = int(20000)
stateQ = Queue()
actQ = Queue() # queues action for backtracking
visitedSet = set()
curState = problem.getStartState()
visitedSet.add(curState)
actionList = [
] # add actions to get to the state, use pop to remove last one
for it in range(MAX_ITER):
if problem.isGoalState(curState):
return actionList
successors = problem.getSuccessors(curState)
for node in successors:
if node[successor_idx['state']] not in visitedSet:
stateQ.push(node[successor_idx['state']])
actQ.push(actionList + [node[successor_idx['dir']]])
visitedSet.add(node[successor_idx['state']])
actionList = actQ.pop()
curState = stateQ.pop()
return []
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
from util import Queue
positions = Queue()
pos = problem.getStartState()
positions.push(pos)
visited = []
paths = Queue()
paths.push([])
while True:
pos = positions.pop()
visited.append(pos)
path = paths.pop()
#print(pos,len(path))
if problem.isGoalState(pos):
return path
suc = problem.getSuccessors(pos)
for i in suc:
newpos = i[0]
if not newpos in visited:
path2 = path.copy()
path2.append(i[1])
positions.push(newpos)
paths.push(path2)
if positions.isEmpty():
break
return []
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
#util.raiseNotDefined()
from game import Directions
from util import Queue
close = set()
fringes = Queue()
#Stack for father nodes doesn't fit BFS, have to enqueue the entire path
currentState = []
currentState.append((problem.getStartState(), None, 1))
fringes.push(currentState)
while (not fringes.isEmpty()):
currentState = fringes.pop()
close.add(currentState[-1][0])
if (problem.isGoalState(currentState[-1][0])):
ret = []
for i in range(1, len(currentState)):
ret.append(currentState[i][1])
return ret
successors_list_not_filtered = problem.getSuccessors(
currentState[-1][0])
for i in range(0, len(successors_list_not_filtered)):
currentState_copy = currentState.copy()
currentState_copy.append(successors_list_not_filtered[i])
fringes.push(currentState_copy)
#Now filter the fringes in case that new states in close set aren't counted in
new_fringes = Queue()
while (not fringes.isEmpty()):
new_fringe = fringes.pop()
if (not new_fringe[-1][0] in close):
new_fringes.push(new_fringe)
fringes = new_fringes
def breadthFirstSearch(problem):
root = problem.getStartState()
rootNode = [root, []]
if problem.isGoalState(root):
return []
frontier = Queue()
frontier.push(rootNode)
explored = []
print("got here")
while not frontier.isEmpty():
if problem.isGoalState(frontier.top()[0]):
print("Found goal state")
goal = frontier.pop()
return goal[1]
node = frontier.pop()
if node[0] not in explored:
explored.append(node[0])
for child_state in problem.getSuccessors(node[0]):
if child_state[
0] not in explored: #to make more efficient make sure not in frontier too
child_path = node[1][:]
child_path.append(child_state[1])
frontier.push([child_state[0], child_path])
return []
def breadthFirstSearch(problem):
successor_idx = {'dir': 1, 'state': 0, 'cost': -1}
MAX_ITER = int(20000)
stateQ = Queue()
actQ = Queue() # queues action for backtracking
visitedSet = set()
curState = problem.getStartState()
visitedSet.add(curState)
actionList = [] # add actions to get to the state, use pop to remove last one
for it in range(MAX_ITER):
if problem.isGoalState(curState):
return actionList
successors = problem.getSuccessors(curState)
for node in successors:
if node[successor_idx['state']] not in visitedSet:
stateQ.push(node[successor_idx['state']])
actQ.push(actionList + [node[successor_idx['dir']]])
visitedSet.add(node[successor_idx['state']])
actionList = actQ.pop()
curState = stateQ.pop()
return []
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
from game import Directions
from util import Queue
frontiers = Queue()
frontiers.push(problem.getStartState())
pathToFrontiers = Queue()
pathToFrontiers.push([Directions.STOP])
exploredSet = list()
while not frontiers.isEmpty():
node = frontiers.pop()
pathToNode = pathToFrontiers.pop()
exploredSet.append(node)
successors = problem.getSuccessors(node)
for child, direction, cost in successors:
if child not in exploredSet:
if child not in frontiers.list:
if problem.isGoalState(child):
return (pathToNode + [direction])[1:]
else:
frontiers.push(child)
pathToFrontiers.push(pathToNode + [direction])
return [Directions.STOP]
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
from util import Queue
fringe = Queue() # Fringe to manage which states to expand
fringe.push(problem.getStartState())
visited = [] # List to check whether state has already been visited
tempPath = [] # Temp variable to get intermediate paths
path = [] # List to store final sequence of directions
pathToCurrent = Queue(
) # Queue to store direction to children (currState and pathToCurrent go hand in hand)
currState = fringe.pop()
while not problem.isGoalState(currState):
if currState not in visited:
visited.append(currState)
successors = problem.getSuccessors(currState)
for child, direction, cost in successors:
fringe.push(child)
tempPath = path + [direction]
pathToCurrent.push(tempPath)
currState = fringe.pop()
path = pathToCurrent.pop()
return path
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
from util import Queue
explored = []
frontier = Queue()
all_paths = Queue()
state = problem.getStartState()
path = []
while not problem.isGoalState(state):
if state not in explored:
# print("State to explore: {} with path {}".format(state, path))
explored.append(state)
for s,a,c in problem.getSuccessors(state):
if s not in explored:
frontier.push(s)
all_paths.push(path + [a])
state = frontier.pop()
path = all_paths.pop()
return path
def breadthFirstSearch(problem):
"*** YOUR CODE HERE ***"
bfsQueue = Queue() # Main DFS stack
histQueue = Queue() # Stack which keeps track of path
vis = [] # visited array
way = [] # Ways returned to the pacman agent
# starting state
state = [(problem.getStartState(), 'Begin')]
bfsQueue.push(state)
# BFS Algo
while not bfsQueue.isEmpty():
inter_state = bfsQueue.pop()
if not histQueue.isEmpty():
way = histQueue.pop()
# check if the node is visited or not
if problem.isGoalState(inter_state[0][0]):
break
if (vis.count(inter_state[0][0]) == 0):
vis.append(inter_state[0][0])
succ_nodes = problem.getSuccessors(inter_state[0][0])
# Find the successor nodes
for item in succ_nodes:
# Get the co-ordinates and the direction to reach
co_ord, _dir = (item[0], item[1])
bfsQueue.push([(co_ord, _dir)])
histQueue.push(way + [_dir])
return way
def breadthFirstSearch(problem):
"""
Search the shallowest nodes in the search tree first.
[2nd Edition: p 73, 3rd Edition: p 82]
"""
"*** YOUR CODE HERE ***"
from util import Queue
frontier = Queue()
explored = []
temp_solution = Queue()
solution = []
frontier.push(problem.getStartState())
node = frontier.pop()
while problem.isGoalState(node) is False:
if node not in explored:
explored.append(node)
succ = problem.getSuccessors(node)
for state, actions, stepCost in succ:
frontier.push(state)
temp = solution + [actions]
temp_solution.push(temp)
node = frontier.pop()
solution = temp_solution.pop()
return solution
def breadthFirstSearch(problem):
from collections import defaultdict
from util import Queue
initial_node=problem.getStartState()
current_node=defaultdict(list)
current_node[initial_node].append("No parent")
current_node[initial_node].append("No direction")
queue=Queue()
queue.push(current_node)
current_node=queue.pop()
direction_list={}
Child=current_node.keys()
Parent=current_node.values()[0]
visited_list={}
while (problem.isGoalState(Child[0]) is not True):
if(Child[0] in visited_list.keys()):
current_node=queue.pop()
Child=current_node.keys()
Parent=current_node.values()[0]
else:
visited_list[Child[0]]=Parent[0]
direction_list[Child[0]]=Parent[1]
Successor_node=problem.getSuccessors(Child[0])
for index in range(len(Successor_node)):
temp_dict=defaultdict(list)
temp_dict[Successor_node[index][0]].append(Child[0])
temp_dict[Successor_node[index][0]].append(Successor_node[index][1])
queue.push(temp_dict)
current_node=queue.pop()
Child=current_node.keys()
Parent=current_node.values()[0]
visited_list[Child[0]]= Parent[0]
direction_list[Child[0]]=Parent[1]
backtracking =[]
path = Child[0]
backtracking.append(direction_list[path])
path = visited_list[path]
print "The path is",path
while (path!= problem.getStartState()):
backtracking.append(direction_list[path])
path = visited_list[path]
backtracking.reverse()
return backtracking
util.raiseNotDefined()
def multipleExpanding(self, current_state, depth):
queue_fathers = Queue()
queue_children = Queue()
queue_fathers.push(TreeNode((current_state, []), None))
if self.hasVisibleEnemy(current_state):
print "searching"
for i in range(0, depth):
while not queue_fathers.isEmpty():
top_father = queue_fathers.pop()
temp_my_children = top_father.expand(
self.generateMyNextStatesIdAction(top_father.value[0]))
temp_enemy_children = map(
lambda my_child: my_child.expand(
self.generateNextEnemyStatesIdAction(
my_child.value[0])), temp_my_children)
temp_enemy_children = filter(lambda x: x != [],
temp_enemy_children)
#print temp_enemy_children
for temp_enemy_children_group in temp_enemy_children:
temp_group_evals = map(
lambda e_state_ids_actions: self.
evaluateEnemyState(e_state_ids_actions.value[0]),
temp_enemy_children_group)
#print temp_group_evals
if temp_group_evals != []:
max_group_eval = max(temp_group_evals)
max_group_children = random.choice(
filter(
lambda x: x[0] == max_group_eval,
zip(temp_group_evals,
temp_enemy_children_group)))[1]
#print max_group_children
queue_children.push(max_group_children)
while not queue_children.isEmpty():
queue_fathers.push(queue_children.pop())
while not queue_fathers.isEmpty():
last_father = queue_fathers.pop()
temp_my_lasts = last_father.expand(
self.generateMyNextStatesIdAction(last_father.value[0]))
temp_evals = map(
lambda x: self.evaluateState(x.value[0], self.index),
temp_my_lasts)
if temp_evals != []:
max_eval = max(temp_evals)
max_evals_my_lasts = filter(lambda x: x[0] == max_eval,
zip(temp_evals, temp_my_lasts))
best_my_last = random.choice(max_evals_my_lasts)[1]
prev_father = None
while best_my_last.father != None:
prev_father = best_my_last
best_my_last = best_my_last.father
if prev_father != None:
return prev_father.value[1][0][1]
return random.choice(current_state.getLegalActions(self.index))
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
from game import Directions
from util import Stack, Queue
import itertools
closed = set([]);
fringe = Queue();
search_node = Queue();
fringe.push([problem.getStartState(),'Stop',0])
#search_node.push([(problem.getStartState(),'Stop',0)])
while True:
if fringe.isEmpty():
print "Failure"
return [];
node = fringe.pop();
nodePath = []
try:
nodePath = search_node.pop();
except IndexError:
pass
if problem.isGoalState(node[0]):
print "goal = ", node;
print "route = ", nodePath
route = extractActions(nodePath)
for item in route:
#print "item = ", item
pass
#return []
return route
if not node[0] in closed:
closed.add(node[0]);
for child_node in problem.getSuccessors(node[0]):
newNodePath = []
for item in nodePath :
newNodePath.append(item)
newNodePath.append(child_node)
fringe.push(child_node);
search_node.push(newNodePath)
util.raiseNotDefined()
def breadthFirstSearch(problem):
"""
Search the shallowest nodes in the search tree first.
[2nd Edition: p 73, 3rd Edition: p 82]
"""
"*** YOUR CODE HERE ***"
from util import Queue
fila = Queue()
colorir = []
acoes = []
inicial = (problem.getStartState(),None,None,0)
"Tupla formada por (Estado atual, Estado Pai, Aчуo, Custo)"
fila.push(inicial)
colorir.append(inicial)
while fila.isEmpty() == False:
noAtual = fila.pop()
if problem.isGoalState(noAtual[0]):
return gerarCaminho(noAtual)
else:
for item in problem.getSuccessors(noAtual[0]):
est = item[0]
aco = item[1]
cus = item[2]
if est not in colorir:
colorir.append(est)
tupla = (est,noAtual,aco,cus)
fila.push(tupla)
def breadthFirstSearch(problem):
"Search the shallowest nodes in the search tree first. [p 81]"
"*** YOUR CODE HERE ***"
from util import Queue
queue = Queue()
exploredSet = set()
pathConstructDict = {}
#print "Start's successors:", problem.getSuccessors(problem.getStartState())
#add start to exploredSet, and check if it is the goal
exploredSet.add(problem.getStartState())
if(problem.isGoalState(problem.getStartState())):
return []
for successor in problem.getSuccessors(problem.getStartState()):
#print successor
queue.push((successor, None))
while(not queue.isEmpty()):
expansion = queue.pop()
if(expansion[0][0] in exploredSet):
continue
exploredSet.add(expansion[0][0])
pathConstructDict[expansion[0]] = expansion[1]
if(problem.isGoalState(expansion[0][0])):
return pathConstructor(expansion[0], pathConstructDict)
for successor in problem.getSuccessors(expansion[0][0]):
queue.push((successor, expansion[0]))
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
path = list()
parentChild = list()
print "Problem: ", problem
print "Start:", problem.getStartState()
print "Is the start a goal?", problem.isGoalState(problem.getStartState())
print "Start's successors:", problem.getSuccessors(problem.getStartState())
if problem.isGoalState(problem.getStartState()):
return None
explored = list()
frontier = Queue()
frontier.push(problem.getStartState())
while (not frontier.isEmpty()):
state = frontier.pop()
#print "Current state: ", state
explored.append(state)
if (problem.isGoalState(state)):
#print "Found..."
path = backtracking(problem, state, parentChild)
return path
for successor in problem.getSuccessors(state):
#print "Successor: ", successor
if (not successor[0] in explored):
parentChild.append((state, successor[1], successor[0]))
frontier.push(successor[0])
return None
def breadthFirstSearch(problem):
"""
Search the shallowest nodes in the search tree first.
[2nd Edition: p 73, 3rd Edition: p 82]
"""
"*** YOUR CODE HERE ***"
from util import Queue
fringe = Queue()
successors = []
state = (problem.getStartState(), "")
fringe.push(state)
visited = set()
while problem.isGoalState(state[0]) == False:
#print "state = %r, visited = %r " % (state[0],visited)
if state[0] not in visited:
successors = problem.getSuccessors(state[0])
visited.add(state[0])
for successor in successors:
pos, dir, cost = successor
#if pos not in visited:
fringe.push((pos,state[1]+dir+' '))
state = fringe.pop()
#print state[0], successors
return state[1].split()
def breadthFirstSearchNormal2(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
from util import Queue
actionListMap = []
visitedList = {}
startState = problem.getStartState()
q = Queue()
q.push(startState)
visitedList[startState] = [None, None]
while not q.isEmpty():
targetState = q.pop()
isGoal = problem.isGoalState(targetState)
if isGoal == None:
actionList = buildActionListFromBFSResult(visitedList,startState, targetState)
actionListMap.append((targetState, actionList))
elif isGoal:
actionList = buildActionListFromBFSResult(visitedList,startState, targetState)
actionListMap.append((targetState, actionList))
print "Meet Goal"
return actionListMap
else:
for successor in problem.getSuccessors(targetState):
state = successor[0]
action = successor[1]
if state not in visitedList.keys():
visitedList[state] = [targetState, action]
q.push(state)
def breadthFirstSearch(problem):
"""
Search the shallowest nodes in the search tree first.
"""
closed = []
closedSet = sets.Set(closed)
fringe = Queue()
for child in problem.getSuccessors(problem.getStartState()):
path = [child[1]]
fringe.push((child[0], path, child[2]))
closedSet.add(problem.getStartState())
while( not(fringe.isEmpty()) ):
nodePos, nodeDir, nodeCost = fringe.pop()
if (problem.isGoalState(nodePos)):
return nodeDir
if (nodePos not in closedSet):
successors = problem.getSuccessors(nodePos)
closedSet.add(nodePos)
path = [nodeDir]
for childNode in successors:
#cost = nodeCost + childNode[2]
path = nodeDir + [childNode[1]]
childNode = [childNode[0], path , child[2]]
fringe.push(childNode)
return -1
def breadthFirstSearch(problem):
"Search the shallowest nodes in the search tree first. [p 81]"
from util import Queue
BFS1 = Queue()
Moves = []
Visited = []
Final = []
NewState = (0, (problem.getStartState(), 'Start', 0))
#print CurrentState
BFS1.push([NewState])
while not BFS1.isEmpty():
NewState = BFS1.pop()
if problem.isGoalState(NewState[0][1][0]):
Final = NewState
break
if Visited.count(NewState[0][1][0]) == 0:
#print NewState
for item in enumerate(problem.getSuccessors(NewState[0][1][0])):
#print item
BFS1.push([item] + NewState)
Visited.append(NewState[0][1][0])
for nodes in Final:
Moves.append(nodes[1][1])
Moves.reverse()
Moves.remove('Start')
#print Moves
return Moves
"""def breadthFirstSearch(problem):
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
from util import Queue
state = problem.getStartState()
visited = [state]
path_dict = {} #path dictionary {next : last} i.e. {(4, 5) : (5, 5)}
act_dict = {} #action dictionary {node : action} i.e. {(4, 5) : 'West'}
actions = []
queue = Queue()
queue.push(state)
while not queue.isEmpty():
state = queue.pop()
if problem.isGoalState(state):
break
for succ in problem.getSuccessors(state):
if succ[0] not in visited:
visited.append(succ[0])
queue.push(succ[0])
path_dict[succ[0]] = state
act_dict[succ[0]] = succ[1]
print path_dict
print state
while state in path_dict:
actions.append(act_dict[state])
state = path_dict[state]
actions.reverse()
return actions
def breadthFirstSearch(problem):
"Search the shallowest nodes in the search tree first. [p 74]"
"*** YOUR CODE HERE ***"
from util import Queue
#util.raiseNotDefined()
currentState = problem.getStartState()
setOfExploredNodes = set([currentState])
listofMoves = []
successorStack = Queue()
counter = 0;
while not problem.isGoalState(currentState):
for successor in problem.getSuccessors(currentState):
if successor[0] not in setOfExploredNodes:
#print successor
setOfExploredNodes.add(successor[0])
successorStack.push((successor[0], listofMoves + [successor[1]]))
currentState = successorStack.pop()
#setOfExploredNodes.add(currentState[0])
listofMoves = currentState[1]
currentState = currentState[0]
counter += 1
if counter % 100 == 0:
print counter
print listofMoves
return listofMoves
def breadthFirstSearch(problem):
"""
Search the shallowest nodes in the search tree first.
[2nd Edition: p 73, 3rd Edition: p 82]
"""
"*** YOUR CODE HERE ***"
from util import Queue
fringe = Queue()
visited = set()
startNode = problem.getStartState()
startNode = (startNode,"",0)
start = Child()
start.create(startNode,[],0,None)
fringe.push(start)
while fringe.list:
node = fringe.pop()
if problem.isGoalState(node.getCoord()):
return node.getPath()
visited.add(node.getNode()[0])
children = problem.getSuccessors(node.getCoord())
for childNode in children:
child = Child()
child.create(childNode,node.getPath(),1,node)
child.addElmt(child.getNode()[1])
if child.getCoord() not in visited and child.getCoord() not in map(Child.getCoord,fringe.list):
fringe.push(child)
return None
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
from util import Queue as queue
queue = queue(
) # Breadth First Search => First in First out strategy using queue
explored = [] # Memorize the explored nodes
queue.push(
([], problem.getStartState())) # push the problem into queue class
# pop from the queue until get the goal or explore all the nodes
while not queue.isEmpty():
path, location = queue.pop()
explored.append(location)
if problem.isGoalState(location):
return path
s = [
x for x in problem.getSuccessors(location)
if x[0] not in explored and x[0] not in (y[1] for y in queue.list)
]
# update the path
for item in s:
fullpath = path + [item[1]]
queue.push((fullpath, item[0]))
print('Stack is empty')
return []
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
from util import Queue
queueOpen = Queue()
rootNode = SearchNode(problem.getStartState(), None, None, 0, 0)
if problem.isGoalState(rootNode.position):
return []
queueOpen.push(rootNode)
visited = {}
#visited;
#cvorovi = [pocetni];
while not queueOpen.isEmpty():
#ako je cvor u visited -> continue
#stavi cvor u visited
#za svakog sljedbenika: ako nije u visited, dodaj ga u cvorove
currentNode = queueOpen.pop()
if currentNode.position in visited:
continue
if problem.isGoalState(currentNode.position):
return currentNode.backtrack()
visited[currentNode.position] = True
for succ in expand(problem, currentNode):
if succ.position not in visited:
temp = SearchNode(succ.position, currentNode, succ.transition, succ.cost, 0)
queueOpen.push(temp)
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
from util import Queue
from game import Directions
Destination = Queue()
VisitedNode = []
Path = []
if problem.isGoalState(problem.getStartState()):
return []
Destination.push((problem.getStartState(), []))
while not Destination.isEmpty():
Node, Path = Destination.pop()
if problem.isGoalState(Node):
return Path
if Node not in VisitedNode:
Successor = problem.getSuccessors(Node)
VisitedNode.append(Node)
for location, action, cost in Successor:
if (location not in VisitedNode):
Destination.push((location, Path + [action]))
util.raiseNotDefined()
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
LOCATION = 0
DIRECTION = 1
q = Queue()
used = set()
cur = State(problem.getStartState(), []) # current (location, path)
q.push(cur)
while not q.isEmpty():
cur = q.pop() # take last item from queue
if cur.location in used:
continue
used.add(cur.location) # mark as used
if problem.isGoalState(cur.location):
break
for x in problem.getSuccessors(cur.location):
if not x[LOCATION] in used:
q.push(State(x[LOCATION], cur.path + [x[DIRECTION]]))
return cur.path
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
start = problem.getStartState()
from util import Queue
fringe = Queue()
fringe.push([(start, 'Start', 1)])
result = None
expanded = [problem.getStartState()]
while result == None:
currentPath = fringe.pop()
currentState = currentPath[-1]
if problem.isGoalState(currentState[0]):
result = currentPath
continue
succ = problem.getSuccessors(currentState[0])
for state in succ:
if state[0] not in expanded:
expanded.append(state[0])
new_list = currentPath[:]
new_list.append(state)
fringe.push(new_list)
steps = []
for state in result[1:]:
steps.append(state[1])
return steps
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
from util import Queue
# 起始节点队列
opened = Queue()
# 已经访问过的节点表
closed = []
# 得到初始节点
opened.push((problem.getStartState(), []))
# 开始遍历
while not opened.isEmpty():
# 得到当前节点
currentNode0, currentNode1 = opened.pop()
# 判断是否是目标节点
if problem.isGoalState(currentNode0):
return currentNode1
# 如果当前节点没有访问过
if currentNode0 not in closed:
# 得到后继节点和运行方向以及花费代价
expand = problem.getSuccessors(currentNode0)
# 将当前节点加入closed表中
closed.append(currentNode0)
# 遍历后继节点
for locations, directions, cost in expand:
if (locations not in closed):
opened.push((locations, currentNode1 + [directions]))
util.raiseNotDefined()
def findPathToClosestDot(self, gameState):
"""
Returns a path (a list of actions) to the closest dot, starting from
gameState.
"""
# Here are some useful elements of the startState
startPosition = gameState.getPacmanPosition(self.index)
food = gameState.getFood()
walls = gameState.getWalls()
problem = AnyFoodSearchProblem(gameState, self.index)
"*** YOUR CODE HERE ***"
from util import Queue
getSucc = problem.getSuccessors
visited = set()
queue = Queue()
queue.push((startPosition, []))
while not queue.isEmpty():
cur, path = queue.pop()
if food[cur[0]][cur[1]]:
return path
if cur not in visited:
visited.add(cur)
for each in getSucc(cur):
if each[0] not in visited:
queue.push((each[0], path + [each[1]]))
return []
def buildMazeDistanceMap(position, gameState):
"""
Use BFS to build a map that stores maze distances between position and each point in the layout
"""
x, y = position
walls = gameState.getWalls()
assert not walls[x][y], 'position is a wall: ' + str(position)
# initialization
distanceMap = {}
queue = Queue()
distance = 0
queue.push(position)
while not queue.isEmpty():
currPos = queue.pop()
if currPos not in distanceMap:
distanceMap[currPos] = distance
for pos in Actions.getLegalNeighbors(currPos, walls):
queue.push(pos)
distance += 1
return distanceMap
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
start = problem.getStartState()
from util import Queue
fringe = Queue()
fringe.push([(start, 'Start', 1)])
result = None
expanded = [problem.getStartState()]
while result == None:
currentPath = fringe.pop()
currentState = currentPath[-1]
if problem.isGoalState(currentState[0]):
result = currentPath
continue
succ = problem.getSuccessors(currentState[0])
for state in succ:
if state[0] not in expanded:
expanded.append(state[0])
new_list = currentPath[:]
new_list.append(state)
fringe.push(new_list)
steps = []
for state in result[1:]:
steps.append(state[1])
return steps
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
from util import Queue
from game import Directions
opened_set = Queue()
closed_set = set()
meta = dict()
root = problem.getStartState()
meta[root] = (None, None)
opened_set.push(root)
while not opened_set.isEmpty():
subtree_root = opened_set.pop()
if problem.isGoalState(subtree_root):
return action_path(subtree_root, meta, root)
for (a, b, c) in problem.getSuccessors(subtree_root):
if (a in closed_set):
continue
if (a not in opened_set.list):
meta[a] = (subtree_root, b)
opened_set.push(a)
closed_set.add(subtree_root)
def breadthFirstSearch(problem):
"""
Search the shallowest nodes in the search tree first.
"""
"*** YOUR CODE HERE ***"
from util import Queue
# fringe
fringe = Queue()
# closed set
closed = set([])
fringe.push((problem.getStartState(), []))
while True:
if fringe.isEmpty() == True:
print 'fail to find a path to the goal state'
return []
else:
node = fringe.pop()
if problem.isGoalState(node[0]) == True:
return node[1]
if node[0] not in closed:
closed.add(node[0])
actionsSoFar = node[1]
for successor in problem.getSuccessors(node[0]):
newActions = actionsSoFar[:]
newActions.append(successor[1])
fringe.push((successor[0], newActions))
def breadthFirstSearch(problem):
"Search the shallowest nodes in the search tree first. [p 81]"
"*** YOUR CODE HERE ***"
from util import Queue
from game import Directions
state = 0
action = 1
cstate = problem.getStartState()
if (problem.isGoalState(cstate)):
return []
q = Queue()
visited = []
q.push((cstate, []))
while(not q.isEmpty()):
cstate, path = q.pop()
visited.append(cstate)
for x in problem.getSuccessors(cstate):
npath = path + [x[action]]
if(visited.count(x[state]) != 0):
continue
if (problem.isGoalState(x[state])):
return npath
nstate = x[state]
visited.append(x[state])
q.push((nstate, npath))
print("Path is not found")
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
# Imports for tools
from util import Queue
from game import Directions
import copy
path = Queue()
path.push((problem.getStartState(), []))
visited = set([problem.getStartState()])
while not path.isEmpty():
info = path.pop()
currentState = info[0]
actions = info[1]
if problem.isGoalState(currentState):
return actions
for successor in problem.getSuccessors(currentState):
if not successor[0] in visited:
visited.add(successor[0])
if ("North" in successor):
actions.append(Directions.NORTH)
elif ("East" in successor):
actions.append(Directions.EAST)
elif ("South" in successor):
actions.append(Directions.SOUTH)
elif ("West" in successor):
actions.append(Directions.WEST)
path.push((successor[0], copy.copy(actions)))
actions.pop()
def breadthFirstSearch(problem):
"Search the shallowest nodes in the search tree first. [p 74]"
"*** YOUR CODE HERE ***"
from util import Queue
successorsExplored = {}
statesExplored = set()
bfsQueue = Queue()
for successor in problem.getSuccessors(problem.getStartState()):
bfsQueue.push((successor, None))
statesExplored.add(problem.getStartState())
if(problem.isGoalState(problem.getStartState())):
return []
while(not bfsQueue.isEmpty()):
currentSuccessorPair = bfsQueue.pop()
if(currentSuccessorPair[0][0] in statesExplored):
continue
successorsExplored[currentSuccessorPair[0]] = currentSuccessorPair[1]
statesExplored.add(currentSuccessorPair[0][0])
if(problem.isGoalState(currentSuccessorPair[0][0])):
return reconstructPath(successorsExplored, currentSuccessorPair[0])
for successor in problem.getSuccessors(currentSuccessorPair[0][0]):
if(successor[0] not in statesExplored):
bfsQueue.push((successor, currentSuccessorPair[0]))
return None
def breadthFirstSearch(problem):
"""
Search the shallowest nodes in the search tree first.
"""
from util import Queue
from game import Directions
actions = []
frontier = Queue()
frontier.push((problem.getStartState(), [], 0))
visited = []
while (frontier.isEmpty() == False):
(currentS, currentP, currentC) = frontier.pop()
if (problem.isGoalState(currentS) == True):
actions = currentP
break
if (visited.count(currentS) == 0):
visited.append(currentS)
successors = problem.getSuccessors(currentS)
for i in range(0,len(successors)):
(neighbor, direction, cost) = successors[i]
if (visited.count(neighbor) == 0):
frontier.push((neighbor, (currentP +[direction]), (currentC + cost)))
print actions
return actions
util.raiseNotDefined()
def breadthFirstSearch(problem):
"Search the shallowest nodes in the search tree first. [p 74]"
"*** YOUR CODE HERE ***"
from util import Queue
currentState = problem.getStartState()
setOfExploredNodes = set([currentState])
listofMoves = []
successorStack = Queue()
while not problem.isGoalState(currentState):
for successor in problem.getSuccessors(currentState):
if successor[0] not in setOfExploredNodes:
if problem.isGoalState(successor[0]):
#print listofMoves + [successor[1]]
return listofMoves + [successor[1]]
setOfExploredNodes.add(successor[0])
successorStack.push((successor[0], listofMoves + [successor[1]]))
currentState = successorStack.pop()
listofMoves = currentState[1]
currentState = currentState[0]
return None
def breadthFirstSearch(problem):
"""
Search the shallowest nodes in the search tree first.
"""
"*** YOUR CODE HERE ***"
queue = Queue()
explored = []
queue.push((problem.getStartState(), [])) #what in the queue is the (state, path)
explored.append(problem.getStartState())
while not queue.isEmpty():
tuple = queue.pop()
currentPath = tuple[1]
if problem.isGoalState(tuple[0]):
return currentPath
suc = problem.getSuccessors(tuple[0])
for triple in suc:
if explored.__contains__(triple[0]):
continue
explored.append(triple[0])
path = currentPath + [triple[1]]
queue.push((triple[0], path))
def breadthFirstSearch(problem):
"""
Search the shallowest nodes in the search tree first.
[2nd Edition: p 73, 3rd Edition: p 82]
"""
"*** YOUR CODE HERE ***"
from util import Queue
fringe_list = Queue()
# closed_states = set()
closed_states = []
startState = problem.getStartState()
fringe_list.push((startState, []))
while not fringe_list.isEmpty():
currentState = fringe_list.pop()
goalState = problem.isGoalState(currentState[0])
if goalState:
return currentState[1]
if currentState[0] not in closed_states:
# closed_states.update({currentState[0]})
closed_states.append(currentState[0])
for successor in problem.getSuccessors(currentState[0]):
fringe_list.push(
(successor[0], currentState[1] + [successor[1]]))
def breadthFirstSearch(problem):
"Search the shallowest nodes in the search tree first. [p 81]"
"*** YOUR CODE HERE ***"
from util import Queue
from game import Directions
# the component of tree is (state, the path to the state)
tree = Queue()
tree.push(((problem.getStartState()), []))
# store the visited state
visited = []
while (not tree.isEmpty()):
(state, path) = tree.pop()
if (problem.isGoalState(state)):
break
successors = problem.getSuccessors(state)
for i in successors:
if (
i[0] not in visited
): # any state has been visited doesn't need to be visited again
visited.append(i[0])
tree.push((i[0], path + [i[1]]))
return path
util.raiseNotDefined()
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
from util import Queue
startState = problem.getStartState()
# Visited
visited = []
# Declare variable for queue node
queueNode = Queue()
# Push start state into queue
queueNode.push((startState,[]))
while(not queueNode.isEmpty()):
currentState, actions = queueNode.pop()
#if currentState not in visited:
#visited.append(currentState)
seccessors = problem.getSuccessors(currentState)
print "\t" , seccessors
for state,action,cost in seccessors:
if state not in visited:
if problem.isGoalState(currentState):
print actions
return actions
visited.append(state)
queueNode.push((state,actions + [action]))
return []
def breadthFirstSearch(problem):
'''
dfs 랑 자료구조만 다르고 로직은 동일
'''
from util import Queue
bfs_q = Queue() # 큐 이용
now_state = problem.getStartState()
bfs_q.push((now_state, []))
is_visited = []
while not bfs_q.isEmpty():
now_state = bfs_q.pop()
if now_state[0] in is_visited:
continue
else:
is_visited.append(now_state[0])
if problem.isGoalState(now_state[0]):
return now_state[1]
for (location, direction, cost) in problem.getSuccessors(now_state[0]):
if location not in is_visited:
bfs_q.push((location, now_state[1] + [direction]))
return []
def breadthFirstSearch(problem):
"""
Search the shallowest nodes in the search tree first.
"""
from util import Queue
from game import Directions
actions = []
frontier = Queue()
frontier.push((problem.getStartState(), [], 0))
visited = []
while (frontier.isEmpty() == False):
(currentS, currentP, currentC) = frontier.pop()
if (problem.isGoalState(currentS) == True):
actions = currentP
break
if (visited.count(currentS) == 0):
visited.append(currentS)
successors = problem.getSuccessors(currentS)
for i in range(0, len(successors)):
(neighbor, direction, cost) = successors[i]
if (visited.count(neighbor) == 0):
frontier.push((neighbor, (currentP + [direction]),
(currentC + cost)))
print actions
return actions
util.raiseNotDefined()
def breadthFirstSearch(problem):
from game import Directions
from util import Queue
traces=[]
StartState=problem.getStartState()
fringe =Queue()
closed = set()
temp=problem.getSuccessors(StartState)
for i in temp:
fringe.push((i,[]))
closed.add(StartState)
solution=[]
s = Directions.SOUTH
w = Directions.WEST
n = Directions.NORTH
e = Directions.EAST
while fringe:
node=fringe.list[-1]
state=node[0][0]
if not problem.isGoalState(state):
fringe.pop()
'if state in corners:'
'traces=traces+[node[1]+[node[0]]]'
if not state in closed:
temp= problem.getSuccessors(state)
if temp==[]:
closed.add(state)
else:
for i in temp:
if not i[0][0] in closed:
fringe.push((i,node[1]+[node[0]]))
closed.add(state)
else:
path=node[1]+[node[0]]
for i in path:
if i[1]=='South':
solution.append(s)
else:
if i[1]=='West':
solution.append(w)
else:
if i[1]=='North':
solution.append(n)
else:
if i[1]=='East':
solution.append(e)
return solution
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
#Init variables
currentCoordinate = problem.getStartState() #The current coordinate we are evaluating
pathToCurrentCoordinate = [] #The current list we are using and updating
fringeCoordinateList = Queue() #List of current edge coordinates, can have duplications
fringeCoordinateList.push(currentCoordinate)
previouslyVisitedCoordinatesList = [] #List of previously visited coordinates
pathsToCoordinates = Queue() #List of lists of actions
pathsToCoordinates.push(pathToCurrentCoordinate)
while(not problem.isGoalState(currentCoordinate) and not fringeCoordinateList.isEmpty()):
#Find the next coordinate from the fringe, that we haven't visited before
topFringeCoordinate = fringeCoordinateList.pop()
pathToCurrentCoordinate = pathsToCoordinates.pop()
while(topFringeCoordinate in previouslyVisitedCoordinatesList):
topFringeCoordinate = fringeCoordinateList.pop()
pathToCurrentCoordinate = pathsToCoordinates.pop()
currentCoordinate = topFringeCoordinate
#Hotfix for autograder
if (problem.isGoalState(currentCoordinate)):
break;
#Add new fringe coordinates to the list, and update the action lists as appropriate
successors = problem.getSuccessors(currentCoordinate)
for successor in successors:
fringeCoordinateList.push(successor[0])
newActionList = list(pathToCurrentCoordinate) #Copy list
newActionList.append(successor)
pathsToCoordinates.push(newActionList)
#Mark that we have visited the current coordinate
previouslyVisitedCoordinatesList.append(currentCoordinate)
result = []
for action in pathToCurrentCoordinate:
result.append(action[1])
return result
def breadthFirstSearch(problem):
"""
Search the shallowest nodes in the search tree first.
"""
"*** YOUR CODE HERE ***"
from util import Queue
#: lista de nodos visitados
closed = []
#: pila que hace la funcion de frontera
frontier = Queue()
# Recogemos el primer estado, creamos un nodo y lo
# insertamos en la pila
frontier.push(Node(problem.getStartState()))
# iteramos hasta que no hayan nodos en la pila
# o hayamos encontrado el objetivo
while not frontier.isEmpty():
#: siguiente nodo a expandir
node = frontier.pop()
#print "\nNodo actual: ", node.state
#print "\nCola: ", frontier.imprime()
#print "\nVisitados: ", visited
#while (raw_input(">>> ") != ""):
# pass
# comprobamos si el estado actual nos cumple el objetivo
if problem.isGoalState(node.state):
# si lo cumple, salimos del bucle
break
if node.state not in closed:
# insertamos el estado en la lista de visitados
closed.append(node.state)
# recuperamos los estados sucesores
for successor in problem.getSuccessors(node.state):
# si el estado sucesor no esta en la frontera, lo encapsulamos
# y lo itroducimos
frontier.push(Node(
successor[0],
node,
successor[1],
successor[2]))
#print frontier
#: acciones para llegar al objetivo
actions = []
# recorremos mientras haya un action en el nodo previo
while node.action:
actions.append(node.action)
node = node.previous
#mostramos el resultado antes de devolverlo
#print actions[::-1]
return actions[::-1]
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
"*** YOUR CODE HERE ***"
from util import Queue
fringe = Queue() # Fringe to manage which states to expand
fringe.push(problem.getStartState())
visited = [] # List to check whether state has already been visited
tempPath=[] # Temp variable to get intermediate paths
path=[] # List to store final sequence of directions
pathToCurrent=Queue() # Queue to store direction to children (currState and pathToCurrent go hand in hand)
currState = fringe.pop()
while not problem.isGoalState(currState):
if currState not in visited:
visited.append(currState)
successors = problem.getSuccessors(currState)
for child,direction,cost in successors:
fringe.push(child)
tempPath = path + [direction]
pathToCurrent.push(tempPath)
currState = fringe.pop()
path = pathToCurrent.pop()
return path
def breadth_first_traverse(root):
"""breadth-first traversal or "level order traversal"
algorithm:
queue.
"""
if not root:
return
q = Queue([root], debug=True)
while q:
p = q.pop(0)
yield p
if p.left: q.append(p.left)
if p.right: q.append(p.right)
def breadthFirstSearch(problem):
from util import Queue
q = Queue()
q.push((problem.getStartState(),[]))
expanded = []
while not q.isEmpty():
top = q.pop()
if problem.isGoalState(top[0]):
return top[1]
successors = problem.getSuccessors(top[0])
for successor in successors:
if not successor[0] in expanded:
q.push((successor[0], top[1]+[successor[1]]))
expanded.append(top[0])
return []
def breadthFirstSearch(problem):
queue = Queue() ; parentNode = []; successors = []; visitedNodes = []
parentChildMapList = {}
currentState = problem.getStartState() #need to remove
while problem.isGoalState(currentState) is False and problem.isGoalState(currentState[0]) is False:
if(currentState == problem.getStartState()):
successors = problem.getSuccessors(currentState)
visitedNodes.append(currentState)
visitedNodes.append((currentState, ()))
else:
successors = problem.getSuccessors(currentState[0])
visitedNodes.append(currentState[0])
if successors != None and len(successors) > 0:
parentNode.append(currentState)
for node in successors:
if(visitedNodes.__contains__(node) == False and visitedNodes.__contains__(node[0]) == False):
queue.push(node)
parentChildMapList[node] = currentState
tempNode = queue.pop()
if((visitedNodes.__contains__(tempNode) == False and visitedNodes.__contains__(tempNode[0]) == False)):
currentState = tempNode
else:
currentState = queue.pop()
validDirections = []
firstState = currentState
while firstState != problem.getStartState():
validDirections.append(firstState[1])
firstState = parentChildMapList[firstState]
validDirections.reverse()
return validDirections
util.raiseNotDefined()
def breadthFirstSearch(problem):
"""Search the shallowest nodes in the search tree first."""
loc_queue = Queue()
visited_node = {}
parent_child_map = {}
direction_list = []
start_node = problem.getStartState()
parent_child_map[start_node] = []
loc_queue.push(start_node)
def traverse_path(parent_node):
while True:
map_row = parent_child_map[parent_node]
if (len(map_row) == 2):
parent_node = map_row[0]
direction = map_row[1]
direction_list.append(direction)
else:
break
return direction_list
while (loc_queue.isEmpty() == False):
parent_node = loc_queue.pop()
if (problem.isGoalState(parent_node)):
pathlist = traverse_path(parent_node)
pathlist.reverse()
return pathlist
elif (visited_node.has_key(parent_node) == False):
visited_node[parent_node] = []
sucessor_list = problem.getSuccessors(parent_node)
no_of_child = len(sucessor_list)
if (no_of_child > 0):
temp = 0
while (temp < no_of_child):
child_nodes = sucessor_list[temp]
child_state = child_nodes[0];
child_action = child_nodes[1];
if (visited_node.has_key(child_state) == False):
loc_queue.push(child_state)
if (parent_child_map.has_key(child_state) == False):
parent_child_map[child_state] = [parent_node,child_action]
temp = temp + 1