Detect anagram in array
Last updated: September 22, 2025
Quick Overview
Given an array of strings, write a function to detect all pairs of anagrams within the array. The function should return a list of tuples, where each tuple contains two strings that are anagrams of each other. The input will be an array of strings, and the output should be a list of unique anagram pairs.
Tesla
September 22, 202513
13
3,597 solved
Given an array of strings, write a function to detect all pairs of anagrams within the array. The function should return a list of tuples, where each tuple contains two strings that are anagrams of each other. The input will be an array of strings, and the output should be a list of unique anagram pairs.
Tesla uses this problem in the Onsite 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 is the worst-case input for your solution?
- What happens if the input contains duplicates?
- Can you optimize the space complexity of your solution?
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Practice DSA ProblemsSample Answer
Problem Analysis
To detect anagrams in an array of strings, we need to identify pairs of words that contain the same characters in different orders. The most effective approach for this problem is to use a hash map (o...
Approach
- Initialize a hash map: Create a dictionary to hold sorted string keys and lists of original strings as values.
- Iterate through the input array: For each string in the array, sort the cha...
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