Complete Linked-List-2

[PrakarshKamal]

No description provided.

[super30admin]

Strengths:

• Your solution correctly implements the in-order traversal and provides the correct sequence of values.
• The code is clean and easy to understand.
• The next() and hasNext() methods are efficient with O(1) time complexity.

Areas for Improvement:

• The space complexity of your solution is O(n), which is not optimal for this problem. The problem requires O(h) space, meaning you should not store all node values at once.
• Consider using a stack to traverse the tree incrementally. This way, you only store the leftmost path of the tree at any point, which uses O(h) space.
• The initialization in your solution does a full traversal upfront, which might be inefficient for large trees if the iterator is only used partially.
• The reference solution uses a stack to push all left nodes during initialization and then pops them one by one, pushing the right subtree's left nodes when needed. This approach is more memory-efficient for the problem constraints.

To improve, you can modify your solution to use a stack instead of a list. Here's a quick outline:

• Initialize a stack.
• In the constructor, push all left nodes starting from the root.
• For next(), pop the top node, push all left nodes of its right child, and return the value.
• For hasNext(), check if the stack is empty.

This approach will meet the O(h) space requirement and still maintain O(1) amortized time for next().