Divide an Array Into Subarrays With Minimum Cost I
A easy-tier problem at 66% community acceptance, tagged with Array, Sorting, Enumeration. Reported in interviews at American Express and 0 others.
Divide an Array Into Subarrays With Minimum Cost is an easy array problem that hits different when you realize the greedy insight in the live assessment. American Express has asked it. The problem looks like a partition puzzle, but the trick is recognizing that you're not really dividing at all, you're just picking which elements to 'pay' for. With a 65% acceptance rate, most candidates get there, but the ones who blank on the greedy choice are the ones who need a safety net. StealthCoder solves this instantly if you freeze on the pattern during your online assessment.
Companies that ask "Divide an Array Into Subarrays With Minimum Cost I"
Divide an Array Into Subarrays With Minimum Cost I is the kind of problem that decides whether you pass. StealthCoder reads the problem on screen and surfaces a working solution in under 2 seconds. Invisible to screen share. The proctor sees nothing. Built by a senior engineer who knows the OA is theater. This is the script.
Get StealthCoderThe naive approach is treating this like a dynamic programming partition problem, which burns time you don't have. The real pattern: sort and greedily pick the two smallest elements to add to your cost, then you're done. The problem statement can obscure that, which is why candidates struggle in real-time assessment conditions. You're not trying all possible divisions, you're recognizing that the minimum cost division always includes the first element plus the two smallest remaining elements. This is a sorting plus enumeration play, not a complex algorithm, but the mental shift from 'dynamic program this' to 'just sort and pick' is where people lose focus. If this problem shows up in your live OA and you blank on that greedy insight, StealthCoder reads the problem and returns the working solution in seconds, invisible to the proctor.
Pattern tags
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Divide an Array Into Subarrays With Minimum Cost I recycles across companies for a reason. It's easy-tier, and most candidates blank under the timer. StealthCoder is the hedge: an AI overlay invisible during screen share. It reads the problem and surfaces a working solution in under 2 seconds. Built by a senior engineer who knows the OA is theater. This is the script. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Divide an Array Into Subarrays With Minimum Cost I interview FAQ
Is this problem really easy, or does it trick you in the assessment?+
It's algorithmically easy, but the wording can misdirect you into overcomplicating. The 65% acceptance rate suggests decent clarity, but in a live assessment under time pressure, you might waste minutes trying a DP approach before the greedy pattern clicks. That's where it stings.
Does American Express still ask this, or was it a one-time thing?+
The input data shows American Express on the record for this problem. Company-level asking patterns vary year to year, so no guarantees, but it's worth knowing if you're targeting that employer. Easy problems stay on rotation longer than hard ones.
What's the core trick I need to internalize before the OA?+
Sorting and enumeration. Once you sort, you're not searching through combinations, you're just picking. The minimum cost is always the first element plus the two smallest others. Practice that pattern on a few similar problems so it becomes reflexive during the assessment.
How does this relate to other array and sorting problems?+
It's a stepping stone. Array and sorting problems often hide a greedy choice under what looks like a search space. This one teaches that lesson cleanly. If you master the greedy insight here, you'll spot it faster in medium-difficulty division and partitioning problems.
If I freeze on this during my assessment, what's the fastest recovery?+
Re-read the problem statement and focus on what 'cost' actually means. The cost formula is explicit. Write out a small example, sort it, and trace which elements you're picking. That usually surfaces the greedy pattern in 30 seconds. If it doesn't, StealthCoder is your fallback.
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