Binary Tree PreOrder Traversal

Short summary

Binary tree preorder traversal visits nodes in root-left-right order. Covers recursive and iterative stack-based implementations, both O(N) time and O(H) space complexity, with code examples and visual walkthrough of tree traversal.

• •Preorder sequence: visit root first, then left subtree, then right subtree
• •Recursive approach follows natural call stack; iterative approach pushes right child before left to maintain order
• •Both solutions achieve O(N) time complexity with O(H) space where H is tree height

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