Get Min Length
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 December 2024 OA included 'Get Min Length,' a deceptively simple string or array problem that trips up candidates who overthink the constraints. You're likely looking at finding the shortest substring, subsequence, or element that meets some condition. The trap is assuming you need dynamic programming or a complex scan when the answer often hinges on a single pass or a greedy observation. StealthCoder will give you the pattern instantly if you blank on the approach during the live assessment.
Pattern and pitfall
Without the full problem text, the pattern is likely one of: find the minimum length substring matching a condition (two-pointers or sliding window), identify the shortest valid subsequence (greedy or BFS), or compute the minimum length after some transformation (string manipulation or counting). The common pitfall is overcomplicating edge cases or forgetting to handle empty results. Candidates often iterate when a single greedy scan suffices. During the live OA, if you're unsure whether to use a window or a recursive check, StealthCoder will confirm the approach so you don't waste 15 minutes on the wrong strategy.
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 Get Min Length 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.
Get Min Length FAQ
Is this a sliding window problem?+
Likely, if you're finding the shortest substring with a property. Sliding window is the go-to pattern for minimum length problems. If the problem asks for minimum window containing X characters or minimum length after removals, that's your hint. Otherwise, it might be greedy or BFS.
What's the trick Wells Fargo usually tests here?+
Often it's recognizing that you don't need DP. A single pass with a pointer or a greedy choice is enough. Candidates waste time building tables when the answer is 'take the shortest valid option and move on.' Read the constraints carefully.
Can I solve this in one pass?+
Almost always yes. If you're thinking you need two nested loops or a hash table lookup per iteration, you're overcomplicating. One or two pointers, one pass, one result. Keep it that simple.
What if the result is empty or there's no valid answer?+
Return -1, 0, or an empty string depending on the spec. Always check the problem's edge case definition. Wells Fargo OAs often include a test case with no valid answer to catch candidates who skip null checks.
How do I prepare for this in 24 hours?+
You can't study this specifically without the full text. Focus on minimum-window-substring (LeetCode 76) and minimum-length-of-string-after-removing-substrings (LeetCode 2696) patterns. Drill two-pointers and greedy thinking, then trust the hedge during the live OA.