[Solved] Serialization 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 across a network connection link to be reconstructed later in the same or another computer environment.

Question

Serialization 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 across a network connection link to be reconstructed later in the same or another computer environment.

Design an algorithm to serialize and deserialize a binary tree. There is no restriction on how your serialization/deserialization algorithm should work. You just need to ensure that a binary tree can be serialized to a string and this string can be deserialized to the original tree structure.

Clarification: The input/output format is the same as how LeetCode serializes a binary tree. You do not necessarily need to follow this format, so please be creative and come up with different approaches yourself.

Example 1:

```Input: root = [1,2,3,null,null,4,5]
Output: [1,2,3,null,null,4,5]
```

Example 2:

```Input: root = []
Output: []
```

Constraints:

• The number of nodes in the tree is in the range `[0, 104]`.
• `-1000 <= Node.val <= 1000`

Python Solution

```# 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):
def ser(root):
if root:
vals.append(str(root.val))
ser(root.left)
ser(root.right)
else:
vals.append('null')
vals = []
ser(root)
return ' '.join(vals)

def deserialize(self, data):
def des():
v = next(vals)
if v=='null':return None
x = TreeNode(int(v))
x.left = des()
x.right = des()
return x

vals = iter(data.split())
return des()

# Your Codec object will be instantiated and called as such:
# codec = Codec()
# codec.deserialize(codec.serialize(root))```