Goto Largest Bucket
Reported by candidates from DataBricks's online assessment. Pattern, common pitfall, and the honest play if you blank under the timer.
DataBricks asked this in August 2024, and it's a deceptively simple problem that trips up candidates who overthink it. You're given buckets with some kind of content or count, and you need to find and return the largest one. The catch is usually in the edge cases: empty input, ties, or what "largest" actually means in the context. If you blank on the live OA, StealthCoder will read the full problem statement and give you the pattern in seconds so you can write confident code.
Pattern and pitfall
This is a linear scan problem dressed up as something fancier. You iterate through the buckets, track the maximum value seen so far, and return the bucket or its index. The real trick is understanding what the problem is actually asking: are you returning the bucket itself, its index, or its value. Most candidates lose points on careless return statements or forgetting to handle empty input. Some versions ask you to break ties (return the first, last, or lexicographically smallest). The algorithm is O(n) time and O(1) space. StealthCoder is your safety net if the problem statement is vague or you second-guess what "goto" means in this context.
The honest play: practice the pattern, and have StealthCoder ready for the one you didn't see coming.
You can drill Goto Largest Bucket 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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Goto Largest Bucket FAQ
Is this really just a max() problem?+
Functionally, yes. The DataBricks version likely wraps it in domain language (buckets, indices, counts). Your job is to strip that away and recognize it's a single pass finding the largest element. Don't get tricked by the naming.
What if there are multiple buckets with the same max value?+
The problem statement (once you read it fully) will specify. Common answers: return the first occurrence, last occurrence, or the bucket ID itself. Read carefully. This is where candidates lose points.
Can the input be empty or null?+
Probably. DataBricks loves edge cases. Handle it explicitly: throw an exception, return -1, or return null, depending on the spec. Not handling it = instant wrong answer.
Do I need to sort or use a heap?+
No. Sorting is O(n log n), a heap is overkill. Linear scan wins. If you're reaching for a data structure beyond a single variable for the max, you're overcomplicating it.
How do I prepare for this in 48 hours?+
Understand what 'largest' and 'bucket' mean once you see the full problem. Write the simplest O(n) solution. Test on edge cases: empty, single element, all equal, negative numbers. That's the job.