Find connected components in string
Last updated: September 11, 2025
Quick Overview
Given a string, identify and return all the connected components, where a connected component is defined as a group of characters that are adjacent and share a common character. The output should be a list of strings, each representing a distinct connected component. For example, in the string "abac", the connected components would be ["a", "b", "c"].
PayPal
September 11, 2025283
10
1,354 solved
Given a string, identify and return all the connected components, where a connected component is defined as a group of characters that are adjacent and share a common character. The output should be a list of strings, each representing a distinct connected component. For example, in the string "abac", the connected components would be ["a", "b", "c"].
Coding interviews at PayPal 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
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 solve this in a single pass?
- How would you parallelize this solution?
- What if the input doesn't fit in memory?
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 find connected components in a string where characters are adjacent and share a common character, we can utilize a graph traversal approach. Each character can be treated as a node in a graph, and ...
Approach
- Create a Graph Representation: We will treat the string as a graph where each character is a node. Adjacent characters will be connected by edges. For example, in the string 'abac', the edges w...
Submit Your Answer
