Find Min Max Difference
Reported by candidates from Amazon's online assessment. Pattern, common pitfall, and the honest play if you blank under the timer.
Amazon's March 2025 OA is asking you to find the min-max difference. This is a classics trap: candidates overthink it and miss the one-line insight. You're looking at an array, you need the spread between its smallest and largest values, and the trick is knowing when to use sorting versus a single pass. If you blank on the approach during the live OA, StealthCoder will surface the pattern instantly so you don't lose time second-guessing.
Pattern and pitfall
The core pattern here is a single-pass traversal with two running variables. Track the minimum and maximum as you iterate once through the array, then return max minus min. Most candidates default to sorting (which works but is suboptimal). The optimal path is O(n) time, O(1) space. Common pitfall: forgetting to initialize min and max properly, especially with negative numbers or when the array has one element. During the live OA, if you freeze on edge cases or initialization syntax, StealthCoder gives you the exact pattern so you can code with confidence.
Drill it cold or hedge it with StealthCoder. Either way, don't walk into the OA hoping you remember the trick.
You can drill Find Min Max Difference cold, or you can hedge it. StealthCoder runs invisibly during screen share and surfaces a working solution in under 2 seconds. The proctor sees the IDE. They don't see what's behind it. Made for the candidate who got the OA invite this morning and has 72 hours, not six months.
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Amazon reuses patterns across OAs. Made for the candidate who got the OA invite this morning and has 72 hours, not six months. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Find Min Max Difference FAQ
Is this really just max minus min?+
Yes. Iterate once, track the smallest and largest values you see, subtract. Edge case: single-element arrays have zero difference. The trick is not overthinking it. If the problem statement asks for something else (pairs, subarrays, etc.), re-read. But the title says min-max difference, so it's the spread.
Should I sort the array?+
No. Sorting works but wastes time and space. One pass through the array is faster and cleaner. O(n) vs O(n log n). In a timed OA, the single-pass approach buys you buffer minutes for edge cases or follow-ups.
What about negative numbers or zeros?+
They don't break the logic. Initialize min to the first element and max to the first element, then compare as you go. If you start min at infinity and max at negative infinity, handle the empty-array case first. Works either way.
Is this pattern still asked at Amazon?+
Yes. This is a warm-up or first question in a lot of Amazon OAs, especially in 2025. It's not hard, but it filters people who panic or over-engineer. Amazon uses it to see if you code cleanly under time pressure.
How do I prep in 48 hours?+
Code it once in your strongest language. Test on single elements, negatives, duplicates, and large spreads. Then move on. This problem isn't the challenge. Handling the pressure and following the hints in the follow-up questions is. Rest, eat, and come calm.