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# 297. Serialize and Deserialize Binary Tree
"""
serialisation is the process of converting a data structure or object into a
sequence of bits so that it can be stored in a file or memory buffer, or
transmitted acorss a network connection link to be reconstructed later in the
same or another computer environment. design an algorithm to serialise and
deserialise a binary tree. there is no restriction on how your serialisation
and deserialisation algorithm shouldd work. you just need to ensure that a
binary tree can be serialised to a string and this string can be deserialised
to the original tree structure.
"""
# Definition for a binary tree node.
class TreeNode(object):
def __init__(self, x):
self.val = x
self.left = None
self.right = None
class Codec:
def serialize(self, root):
"""Encodes a tree to a single string.
:type root: TreeNode
:rtype: str
"""
vals = []
def ser(node):
if node:
vals.append(str(node.val))
ser(node.left)
ser(node.right)
ser(root)
return "".join(vals)
def deserialize(self, data):
"""Decodes your encoded data to tree.
:type data: str
:rtype: TreeNode
"""
vals = iter(data.split())
def deser():
val = next(vals)
if val == "#":
return None
node = TreeNode(int(val))
node.left = deser()
node.right = deser()
return node
return deser()
# Your Codec object will be instantiated and called as such:
# ser = Codec()
# deser = Codec()
# ans = deser.deserialize(ser.serialize(root))
if __name__ == "__main__":
ser = Codec()
deser = Codec()
root = [1, 2, 3, None, None, 4, 5]
print(deser.deserialize(ser.serialize(root)))
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