Detect palindrome in string
Last updated: October 15, 2025
Quick Overview
Given a string, write a function to determine if it is a palindrome, meaning it reads the same forwards and backwards, ignoring spaces, punctuation, and capitalization. The function should return a boolean value: true if the string is a palindrome and false otherwise.
HRT
October 15, 202530
12
4,600 solved
Given a string, write a function to determine if it is a palindrome, meaning it reads the same forwards and backwards, ignoring spaces, punctuation, and capitalization. The function should return a boolean value: true if the string is a palindrome and false otherwise.
HRT uses this problem in the Take-home Project to evaluate your algorithmic thinking. They expect you to discuss multiple approaches, analyze trade-offs between them, and implement the optimal solution with clean, readable code.
What the Interviewer Expects
- Recognize the underlying problem pattern (sliding window, two pointers, BFS/DFS, etc.)
- Discuss multiple approaches and trade-offs before coding
- Implement an optimal solution with clean, production-quality code
- Handle all edge cases including boundary conditions and invalid input
- Optimize both time and space complexity with clear justification
- Test your solution systematically with well-chosen examples
Key Topics to Cover
How to Approach This
- Clarify input constraints and edge cases before writing code.
- Walk through your approach verbally and confirm with the interviewer before coding.
- Start with a brute force solution, then optimize. Mention time and space complexity.
- Test your solution with examples, including edge cases like empty input or duplicates.
- Consider common patterns: sliding window, two pointers, hash map, BFS/DFS, dynamic programming.
Possible Follow-up Questions
- What if the input doesn't fit in memory?
- What happens if the input contains duplicates?
- Can you optimize the space complexity of your solution?
Sharpen Your Skills on Codemia
Practice similar problems with our interactive workspace, get AI feedback, and track your progress.
Practice DSA ProblemsSample Answer
Problem Analysis
To determine if a given string is a palindrome, we can use the Two Pointers technique. This approach is appropriate here because we need to compare characters from both ends of the string while ig...
Approach
- Preprocess the String: Convert the string to lowercase and filter out non-alphanumeric characters. For example, the input
"A man, a plan, a canal: Panama"will be transformed to `"amanaplanac...
Submit Your Answer
