Get Min Operations
Reported by candidates from Mathwork's online assessment. Pattern, common pitfall, and the honest play if you blank under the timer.
You've got a Mathworks OA in your inbox from September 2024, and the problem is called Get Min Operations. This one's asking you to find the minimum number of steps to reach some goal state. No problem text leaked yet, but the title alone tells you it's a greedy or BFS hunt for the shortest path. You're not prepping for weeks here. You're looking for the pattern so when you sit down live, you don't blank. StealthCoder sits invisible on your screen during the OA as a safety net if the logic stalls.
Pattern and pitfall
Min operations problems almost always boil down to either greedy (pick the locally optimal move each time) or BFS (explore all states level by level to find the shortest). Mathworks leans toward problems with real algorithmic meat, so expect you'll need to model the state space correctly and then search it efficiently. The trick is not to overthink it. Most candidates jam up trying to construct some elaborate solution when the real pattern is just clear state transitions and a simple traversal. If you can't see the greedy invariant immediately, BFS is your fallback. StealthCoder will read the problem on your screen and show you the pattern in real time if you're stuck.
If this hits your live OA and you blank, StealthCoder solves it in seconds, invisible to the proctor.
You can drill Get Min Operations 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 by an Amazon engineer who would have shipped this the night before his JPMorgan OA if he'd had it.
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Make sure you actually pass Mathwork's OA.
Mathwork reuses patterns across OAs. Built by an Amazon engineer who would have shipped this the night before his JPMorgan OA if he'd had it. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Get Min Operations FAQ
Is this a greedy or BFS problem?+
Without the full problem text it's hard to say, but both are common. Greedy works if you can prove each local choice leads to global optimality. BFS is safer if you're unsure. Mathworks likes problems that require you to reason about state transitions, so start by asking what states exist and what moves are legal.
How do I model the state space?+
Think about what the starting state is and what the goal is. Each operation changes the state in one specific way. Map out a few transitions by hand before you code. That clarity usually makes the algorithm obvious. Don't jump to code until you can describe the moves in plain English.
What's the common pitfall?+
Overcomplicating the search or missing an operation that's allowed. Candidates often don't read all the allowed moves carefully. Write them down as a list, then verify your transitions cover every one before you submit.
How do I prepare in 48 hours?+
You can't cram algorithms. Instead, get comfortable with BFS and simple greedy reasoning. Review a few min-steps problems on LeetCode like Open the Lock or Word Ladder. The pattern repeats. Then rest. The OA tests coding speed and clarity, not genius.
Should I code BFS or greedy first?+
If you see a clear greedy invariant, code that. If not, BFS is your safe choice and usually fast enough for Mathworks constraints. BFS is also easier to debug live because you can print the queue and trace the path.