Leetcode Problem 297. Serialize and Deserialize Binary Tree

297. Serialize and Deserialize Binary Tree

Leetcode Solutions

Preorder Depth First Search (DFS) Serialization

  1. Define a recursive function serializeHelper that takes a TreeNode as input and returns a string representation of the tree.
    • If the node is null, append 'None,' to the result string.
    • Otherwise, append the node's value followed by a comma, then recursively call serializeHelper on the left and right children.
  2. Implement the serialize method that calls serializeHelper starting from the root.
  3. Define a recursive function deserializeHelper that takes a list of strings (tree values) and returns the root of the reconstructed binary tree.
    • If the first element is 'None', remove it and return null.
    • Otherwise, create a new TreeNode with the first element as the value, then recursively call deserializeHelper for the left and right children.
  4. Implement the deserialize method that splits the input string by commas into a list and calls deserializeHelper.
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Breadth First Search (BFS) Serialization

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