Detect subsequence in string
Last updated: February 23, 2026
Quick Overview
Given string, detect all occurrences of the palindrome pattern.
HashiCorp
February 23, 2026188
13
1,647 solved
Given string, detect all occurrences of the palindrome pattern.
This coding problem is frequently asked during Onsite at HashiCorp. The interviewer is testing your ability to translate a problem into clean, working code while discussing time and space complexity. HashiCorp expects candidates to write production-quality code, not just solve the puzzle.
What the Interviewer Expects
- Identify the correct data structure and algorithm for the problem
- Write clean, bug-free code with proper variable naming
- Analyze time and space complexity correctly
- Handle basic edge cases (empty input, single element)
- Communicate your thought process while coding
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 happens if the input contains duplicates?
- What if the input doesn't fit in memory?
- How would you modify your solution to handle streaming input?
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