Question Details

Answered: - def getaddchild(puzzle, puzzlenode): """ Ad


def getaddchild(puzzle, puzzlenode):

""" Adds children to a node if there are extensions to a puzzle. If there are no extensions, returns NONE

@type: Puzzle, PuzzleNode

@rtype: None

"""

children = puzzle.extensions()

if not children:

return None

else:

for child in children:

puzzlenode.add_children(child)



def depth_first_solve(puzzle):

"""

Return a path from PuzzleNode(puzzle) to a PuzzleNode containing

a solution, with each child containing an extension of the puzzle

in its parent. Return None if this is not possible.


@type puzzle: Puzzle

@rtype: PuzzleNode

"""


path = []

return _dfs(puzzle, path)


def _dfs(puzzle, path):

"""

"""

if puzzle.is_solved():

return path[0]

node = PuzzleNode(type(puzzle), None, None)

getaddchild(puzzle, node)

if node not in path:

path.append(node)

for child in node.children:

_dfs(child, path)


Thank you


 


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