Detect subsequence in array
Last updated: January 9, 2026
Quick Overview
Given array, detect all occurrences of the anagram pattern.
Scale AI
Coding & Algorithms
Software Engineer
Scale AI
January 9, 2026Software Engineer
Phone Screen
Coding & Algorithms
Medium
6
9
3,958 solved
Given array, detect all occurrences of the anagram pattern.
Coding interviews at Scale AI focus on problem-solving approach as much as the final solution. The interviewer wants to see you break down the problem, consider edge cases, and optimize iteratively. Communication throughout the process is key.
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
Tree structures and recursion
Dynamic programming and memoization
Hash maps and frequency counting
Binary search and divide and conquer
Sorting and searching
Time and space complexity analysis
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?
- Can you optimize the space complexity of your solution?
- Can you solve this in a single pass?
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Practice DSA ProblemsSample Answer
Problem Analysis
To detect all occurrences of an anagram pattern in a given array, we can recognize that this problem can be approached using a sliding window technique combined with frequency counting. The sl...
Approach
- Count the Frequency of the Pattern: Start by creating a frequency map of the characters in the anagram pattern. For example, if the pattern is 'abc', the frequency map would be: { 'a': 1, 'b': ...
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