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Solution: Binary Tree Preorder Traversal

Explore how to implement preorder traversal of a binary tree with depth-first search efficiently using the Morris traversal technique. Understand how to visit nodes in root-left-right order without recursion or extra stacks, by temporarily modifying tree pointers. Learn the algorithm's linear time complexity and constant space usage to optimize binary tree operations.

Statement

Given the root of a binary tree, your task is to return a list containing the values of its nodes in preorder traversalIn preorder traversal, we visit each node by first visiting the current node, then its left subtree, and finally its right subtree order.

Constraints:

  • The number of nodes in the tree is in the range [0,100] ...