Validate array complete
Last updated: October 28, 2025
Quick Overview
Given an array of integers, write a function to validate if the array is complete, meaning that every integer from 1 to the length of the array is present exactly once. The function should return a boolean value: true if the array is complete, and false otherwise.
Optiver
October 28, 2025247
13
2,705 solved
Given an array of integers, write a function to validate if the array is complete, meaning that every integer from 1 to the length of the array is present exactly once. The function should return a boolean value: true if the array is complete, and false otherwise.
Optiver uses this problem in the Take-home Project 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
- 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
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 you parallelize this solution?
- How would you test this solution thoroughly?
- What if the input doesn't fit in memory?
- Can you optimize the space complexity of your solution?
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Practice DSA ProblemsSample Answer
Problem Analysis
To determine if the array is complete, we need to check if every integer from 1 to the length of the array (n) appears exactly once in the array. This problem can be effectively solved using a frequen...
Approach
- Initialize an empty set to store unique integers.
- Iterate over each integer in the array:
- If the integer is less than 1 or greater than the length of the array (n), return false immediately...
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