cpp-flashcards/org/study_deck_02/dsa/trees/0297-serialize-and-deserialize-binary-tree.org

#+PROPERTY: STUDY_DECK_02
* TODO 0297. Serialize And Deserialize Binary Tree :hard:
:PROPERTIES:
:NEETCODE: [[file:../../roadmap.org::*0297. Serialize And Deserialize Binary Tree][0297. Serialize And Deserialize Binary Tree]]
:END:

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:*


#+begin_src
Input: root = [1,2,3,null,null,4,5]
Output: [1,2,3,null,null,4,5]
#+end_src


*Example 2:*


#+begin_src
Input: root = []
Output: []
#+end_src


*Constraints:*

 - The number of nodes in the tree is in the range ~[0, 10^{4}]~.

 - ~-1000 <= Node.val <= 1000~

** TODO Approach
Write your approach here.

** TODO Python
#+begin_src python
# 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
        """
        

    def deserialize(self, data):
        """Decodes your encoded data to tree.
        
        :type data: str
        :rtype: TreeNode
        """
        

# Your Codec object will be instantiated and called as such:
# ser = Codec()
# deser = Codec()
# ans = deser.deserialize(ser.serialize(root))
#+end_src

** TODO C++
#+begin_src cpp
/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
 * };
 */
class Codec {
public:

    // Encodes a tree to a single string.
    string serialize(TreeNode* root) {
        
    }

    // Decodes your encoded data to tree.
    TreeNode* deserialize(string data) {
        
    }
};

// Your Codec object will be instantiated and called as such:
// Codec ser, deser;
// TreeNode* ans = deser.deserialize(ser.serialize(root));
#+end_src