How do you check if an array is sorted in code?
This question tests your ability to iterate through data structures and validate ordering constraints efficiently. It evaluates basic algorithmic thinking and loop logic.
Why Interviewers Ask This
Interviewers ask this to verify that candidates understand fundamental array traversal and comparison operations. They want to see if you can handle edge cases like empty arrays or single elements. Additionally, it assesses your ability to write clean, readable code with optimal time complexity for simple tasks.
How to Answer This Question
Start by clarifying the definition of a sorted array with the interviewer. Explain your approach using a single pass loop comparing adjacent elements. Mention handling edge cases such as null inputs or arrays with one element. Finally, discuss the time complexity being O(n) and space complexity being O(1).
Key Points to Cover
- Iterate through the array once
- Compare adjacent elements
- Handle edge cases like empty arrays
- Return boolean result
Sample Answer
To check if an array is sorted, I would iterate through the array from the first element to the second-to-last element. In each iteration, I compare the current element with the next one. If I find any pair where the cur…
Common Mistakes to Avoid
- Forgetting to handle empty arrays
- Using nested loops unnecessarily
- Not returning early on failure
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