Transform string to sorted array
Last updated: December 16, 2025
Quick Overview
Convert the given array to sorted result following the specified rules.
xAI
December 16, 20252
14
3,861 solved
Convert the given array to sorted result following the specified rules.
This coding problem is frequently asked during Onsite at xAI. The interviewer is testing your ability to translate a problem into clean, working code while discussing time and space complexity. xAI expects candidates to write production-quality code, not just solve the puzzle.
What the Interviewer Expects
- Quickly identify the optimal approach and its theoretical basis
- Handle complex algorithm design with multiple interacting components
- Write concise, elegant code under time pressure
- Prove correctness of your approach and discuss alternative solutions
- Optimize beyond the obvious: discuss constant factor improvements
- Address follow-up variations and explain how the solution generalizes
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 your solution change if the input was sorted?
- What is the worst-case input for your solution?
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Problem Analysis
The problem requires us to transform a given array into a sorted array following specific rules. Given the constraints and the nature of sorting required, a divide and conquer approach, specifically u...
Approach
- Divide: Recursively split the array into two halves until each sub-array contains a single element. For example, if the input array is [5, 3, 8, 6], it splits into [5, 3] and [8, 6].
- **Conqu...
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