Validate string complete
Last updated: August 18, 2025
Quick Overview
Given a string, write a function to validate whether it is a complete string, meaning it contains all the necessary characters in the correct order and quantity. The function should return true if the string is complete and false otherwise. Consider edge cases such as empty strings and strings with missing characters.
NVIDIA
August 18, 20252
9
2,495 solved
Given a string, write a function to validate whether it is a complete string, meaning it contains all the necessary characters in the correct order and quantity. The function should return true if the string is complete and false otherwise. Consider edge cases such as empty strings and strings with missing characters.
NVIDIA 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 if the input doesn't fit in memory?
- How would your solution change if the input was sorted?
- Can you optimize the space complexity of your solution?
- How would you test this solution thoroughly?
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Practice DSA ProblemsSample Answer
Problem Analysis
This problem can be approached using a frequency counting technique, which involves using a hash map (or dictionary) to count the occurrences of each character required in the complete string. The...
Approach
- Define the Complete String: Start by defining what the complete string is. For example, let's say the complete string is 'abc'. We need to check if our input string contains 'a', 'b', and 'c' i...
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