Round 1
Questions:
- Valid Palindrome II:
- Specific question not provided.
- Post-Order Iterator for a Binary Tree:
- This isn’t on LeetCode, but it is similar to the Binary Search Tree Iterator, except for post-order traversal.
- Specific question not provided.
Candidate's Approach
- For the Valid Palindrome II question, the candidate solved the problem and provided a detailed walkthrough of the solution.
- For the Post-Order Iterator question, the candidate started with a brute-force approach and was encouraged by the interviewer to think of a better solution. They explained the iterative approach using a stack but could not complete the implementation within the time limit. The candidate understood the approach and time complexity well but ran out of time to finalize the working code.
Interviewer's Feedback
The interviewer seemed satisfied with the candidate's approach and explanation, despite the incomplete code for the second question.