Detect anagram in array
Last updated: February 27, 2026
Quick Overview
Given an array of strings, write a function to detect and return all pairs of strings that are anagrams of each other. The function should take an array of strings as input and output a list of tuples, where each tuple contains two anagram strings. Ensure that the solution is efficient and handles edge cases such as empty strings and varying cases.
Datadog
February 27, 20267
12
542 solved
Given an array of strings, write a function to detect and return all pairs of strings that are anagrams of each other. The function should take an array of strings as input and output a list of tuples, where each tuple contains two anagram strings. Ensure that the solution is efficient and handles edge cases such as empty strings and varying cases.
This coding problem is frequently asked during Phone Screen at Datadog. The interviewer is testing your ability to translate a problem into clean, working code while discussing time and space complexity. Datadog expects candidates to write production-quality code, not just solve the puzzle.
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
- How would your solution change if the input was sorted?
- What happens if the input contains duplicates?
- Can you solve this iteratively instead of recursively (or vice versa)?
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Practice DSA ProblemsSample Answer
Problem Analysis
To detect anagrams, we can utilize the fact that two strings are anagrams if they contain the same characters in the same frequency, regardless of order. A suitable pattern for this problem is the **h...
Approach
- Initialize a Dictionary: Create a dictionary to group strings by their sorted characters (which will act as a key).
- Iterate through each string: For each string in the input array, con...
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