Count Inaccurate Results
Reported by candidates from Amazon's online assessment. Pattern, common pitfall, and the honest play if you blank under the timer.
Amazon asked this in October 2024, and it's a straightforward counting problem disguised as a data validation task. You're given some set of results and need to count how many fall outside acceptable bounds or match certain criteria. The trap is overthinking the validation logic. It's not about complex state machines or graph traversal. It's about iterating through a collection, applying a condition, and incrementing a counter. If you blank on the live OA, StealthCoder will read the exact problem and give you the pattern so you don't panic.
Pattern and pitfall
This problem lives in the counting and conditional-filtering space. You iterate through your input (likely an array or list of records), apply a boolean check against each element, and sum up matches. The 'inaccuracy' is defined by the problem statement, which typically means comparing against a threshold, a reference value, or a set of rules. The common pitfall is misreading what 'inaccurate' means in context. Some candidates build elaborate data structures when a single pass with a counter does it. The algorithmic complexity is O(n), where n is the size of your dataset. If you're stuck during the OA, StealthCoder acts as your safety net by showing you the exact wording and confirming whether you need one pass or multiple, saving you precious minutes.
The honest play: practice the pattern, and have StealthCoder ready for the one you didn't see coming.
You can drill Count Inaccurate Results 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. Built for the candidate who saw this exact problem leak two days before his OA and wondered if anyone had a play.
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Count Inaccurate Results FAQ
Is this really just a loop and counter?+
Yes. Iterate once, check a condition on each element, increment a counter if the condition is true. The challenge is understanding what the problem defines as 'inaccurate.' Read the problem statement twice before coding.
What's the time complexity I should aim for?+
O(n) where n is the number of results. You cannot do better than a single pass. If your solution is O(n^2) or uses sorting, you've misunderstood the problem.
Will I need a hash table or extra data structures?+
Unlikely. Most counting problems at this level need only a counter variable and possibly a single comparison. Keep it simple unless the problem explicitly asks for grouping or lookups.
How do I know what counts as 'inaccurate'?+
The problem will define it: maybe a value outside a range, a mismatch against expected output, or a score below a threshold. Extract that definition from the problem text and code exactly that condition.
Can I solve this in under 5 minutes?+
Yes. Read the problem, write the loop and condition, test against the examples, submit. If you're taking longer, you're either misreading the definition or overcomplicating the logic.