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.
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Problem Statement
Suppose you are given a binary tree. You need to print the preorder traversal of the tree.
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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.
Recursive Approach
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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
It uses stack data structure to print the preorder traversal.
Steps to Follow
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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