Prerequisites :- Binary Trees.
Problem: Print nodes of a given binary tree in a postorder manner.
Solution Approach: Postorder traversal is another depth-first traversal method for binary trees. In postorder traversal, the nodes are visited in the following sequence:
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- Traverse the Left Subtree:
- Recursively perform a postorder traversal on the left subtree of the current node.
- For each node in the left subtree, repeat step 1.
- Traverse the Left Subtree:
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- Traverse the Right Subtree:
- Recursively perform a postorder traversal on the right subtree of the current node.
- For each node in the right subtree, repeat step 1.
- Traverse the Right Subtree:
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- Visit the Root Node:
- Process/visit the data (or perform an operation) associated with the root node.
- Visit the Root Node:
Time complexity: O(N), where N is the number of nodes in the tree. Each node is visited once.
Space complexity: O(1), as we don’t need any extra space.