Optimize rotation for without recursion
Last updated: March 30, 2026
Quick Overview
Given an array representing a rotated sorted list, write a function to optimize the rotation of the array without using recursion. Your function should take the array and the number of positions to rotate as inputs and return the rotated array. Ensure that your solution operates efficiently with a time complexity better than O(n).
Anduril
March 30, 2026235
13
319 solved
Given an array representing a rotated sorted list, write a function to optimize the rotation of the array without using recursion. Your function should take the array and the number of positions to rotate as inputs and return the rotated array. Ensure that your solution operates efficiently with a time complexity better than O(n).
This coding problem is frequently asked during Technical Screen at Anduril. The interviewer is testing your ability to translate a problem into clean, working code while discussing time and space complexity. Anduril expects candidates to write production-quality code, not just solve the puzzle.
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
- How would your solution change if the input was sorted?
- Can you optimize the space complexity of your solution?
- Can you solve this in a single pass?
- How would you modify your solution to handle streaming input?
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Practice DSA ProblemsSample Answer
Problem Analysis
The problem requires us to rotate a sorted array efficiently without using recursion. The key observation is that a rotated sorted array can be viewed as two sorted subarrays, and finding the optimal ...
Approach
- Identify the Rotation Point: We first need to find the index of the smallest element in the rotated sorted array, which indicates where the rotation occurred. This can be done using a modified ...
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