Transform array to adjacency list
Last updated: August 20, 2025
Quick Overview
Convert the given array to sorted result following the specified rules.
Shopify
Coding & Algorithms
Software Engineer
Shopify
August 20, 2025Software Engineer
Phone Screen
Coding & Algorithms
Easy
35
3
4,980 solved
Convert the given array to sorted result following the specified rules.
Coding interviews at Shopify 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
- 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
Binary search and divide and conquer
Hash maps and frequency counting
Graph algorithms and traversal
Data structure selection and trade-offs
Common algorithm patterns (sliding window, two pointers, BFS/DFS)
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
- Can you optimize the space complexity of your solution?
- What happens if the input contains duplicates?
- Can you solve this in a single pass?
- How would your solution change if the input was sorted?
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 convert the given array into an adjacency list, we need to understand that each element in the array can represent a node in a graph. The adjacency list will essentially map each node to the nodes ...
Approach
- Initialize an empty dictionary to serve as the adjacency list.
- Iterate through the array: For each element
a[i], check if it exists in the dictionary. If it does not exist, add it with...
Submit Your Answer
Markdown supported