Leetcode Problem 109. Convert Sorted List to Binary Search Tree

109. Convert Sorted List to Binary Search Tree

Leetcode Solutions

Approach: Inorder Simulation

  1. Calculate the length of the linked list.
  2. Use a recursive helper function convertListToBST which takes parameters start and end to represent the start and end of the list that needs to be converted to a BST.
  3. If start > end, return None as we have no elements to form a subtree.
  4. Calculate the middle index as (start + end) // 2.
  5. Recursively build the left subtree using the range start to mid - 1.
  6. The current list node will be the root node, so create a TreeNode with the current list node's value.
  7. Move the list head to the next element.
  8. Recursively build the right subtree using the range mid + 1 to end.
  9. Return the root node.
UML Thumbnail

Approach: Recursion

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