Max Distance
Reported by candidates from Wells Fargo's online assessment. Pattern, common pitfall, and the honest play if you blank under the timer.
Wells Fargo's Max Distance problem landed in October 2024 and it's a range or coordinate geometry question that trips up candidates who overthink the spatial logic. You've got an OA in the next 48 hours and no time to spiral. The trick is usually recognizing whether you're finding the furthest two points in a set, the largest gap between elements, or the maximum radius from a pivot. StealthCoder sits invisibly on your screen during the live assessment and can feed you the pattern the moment you see the full prompt, so you don't blank on the approach.
Pattern and pitfall
Without the full problem text, the pattern could be math-heavy, sorting-based, or a two-pointer scan depending on whether you're working with coordinates, distances, or sorted arrays. Max Distance problems typically reward candidates who spot that sorting or iterating smartly removes the need for nested loops. The common miss: trying every pair when a single pass after preprocessing solves it. The hedge: if you recognize it's asking for the maximum difference or span, you likely sort, then compare endpoints or adjacent elements. StealthCoder's real value during the OA is confirming the edge cases (duplicates, single element, all same value) so you don't code a half-solution under pressure.
Memorize the pattern. If you can't, run StealthCoder. The proctor sees the IDE. They don't see what's behind it.
You can drill Max Distance 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 by an engineer who treats the OA as theater. If yours is tonight, you don't have time to grind. You have time to hedge.
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Wells Fargo reuses patterns across OAs. Made by an engineer who treats the OA as theater. If yours is tonight, you don't have time to grind. You have time to hedge. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Max Distance FAQ
Is this a two-pointer problem?+
Likely. Two-pointer or single-pass logic usually handles max distance. If the data is sorted or can be sorted first, you probably iterate from both ends inward or scan left-to-right once. Avoid nested loops unless the constraint is tiny.
How do I avoid the brute-force trap?+
Don't compute every pair. Think about what preprocessing (sort, hash, prefix scan) reveals the max without redundant checks. Max distance questions reward elegance, not exhaustion.
What if the problem involves coordinates?+
Then you're likely finding the Euclidean or Manhattan distance between two points in a set. Sort by one axis, then scan or binary search. Coordinate problems almost never require O(n^2) in real interviews.
How much should I memorize before the OA?+
Don't memorize. Understand that max problems often have a greedy or monotonic insight. If you see an array, think about sorting first. If you see coordinates, think about which axis to pivot on. The rest flows.
What's the most common mistake candidates make?+
Assuming you need to check every combination. You don't. Max distance almost always yields to a single sorted pass, a two-pointer scan, or a hash lookup. Write the simple version first, then optimize.