Validate array sorted
Last updated: November 9, 2025
Quick Overview
Given an array of integers, write a function to determine if the array is sorted in non-decreasing order. The function should return a boolean value: true if the array is sorted, and false otherwise.
Snowflake
November 9, 202535
10
917 solved
Given an array of integers, write a function to determine if the array is sorted in non-decreasing order. The function should return a boolean value: true if the array is sorted, and false otherwise.
This coding problem is frequently asked during Onsite at Snowflake. The interviewer is testing your ability to translate a problem into clean, working code while discussing time and space complexity. Snowflake expects candidates to write production-quality code, not just solve the puzzle.
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 test this solution thoroughly?
- How would you parallelize this solution?
- Can you solve this in a single pass?
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Problem Analysis
To determine if an array is sorted in non-decreasing order, we can utilize a single pass through the array. The two-pointer technique applies here because we can maintain an index to compare adjacent ...
Approach
- Initialize a loop that iterates from the first element to the second to last element of the array.
- In each iteration, compare the current element with the next element.
- If the current element...
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