A Complet Guide to Preorder Traversal

What is Preorder Traversal?

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Problem Statement

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A recursive approach is implemented by first calling the root of the current tree and then traversing the left and right subtrees.

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Time Complexity: O(N), where N is size of binary tree Space Complexity: O(1)

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How to implement Recursive approach in different programming languages?

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Iterative Approach

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Time Complexity: O(N), where N is size of binary tree Space Complexity: O(N)

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How to implement Iterative approach in different programming languages?

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A Complet Guide to Preorder Traversal

What is Preorder Traversal?

Pre-Order traverses the binary tree in which our directions are fixed: root -> left -> right. It means that the root will be traversed first, then the left subtree, and then the right subtree.