Minimum Moves to Equal Array Elements
A medium-tier problem at 58% community acceptance, tagged with Array, Math. Reported in interviews at Indeed and 1 others.
You've got an array and one operation: increment all elements except one. The goal is to make every element equal, minimizing the number of moves. It's a medium-difficulty problem that shows up at Indeed and Coursera, and the acceptance rate sits around 58 percent. Most candidates see "increment" and start simulating the moves one by one. That's the trap. The real insight flips the problem on its head, and once you see it, the solution is a single line of math. If this problem hits your live assessment and you blank on the trick, StealthCoder solves it in seconds, invisible to the proctor.
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Minimum Moves to Equal Array Elements 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 an engineer who got tired of watching his cohort grind for six months and still get filtered at the OA stage.
Get StealthCoderThe naive approach is to simulate incrementing all-but-one elements until they're equal. That works for small inputs but times out instantly on larger arrays. The key is recognizing that incrementing all elements except one is mathematically identical to decrementing that one element instead. Flip the perspective: instead of moving everyone else up, move the smallest element down (in your head) to match the target. The target is the minimum value in the array, and the answer is the sum of differences between each element and that minimum. Array and Math problems like this often hide the real solution behind a perspective shift. Most candidates spend time on simulation; you're done with the math. When you walk into the assessment, this pattern recognition matters more than speed.
Pattern tags
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Minimum Moves to Equal Array Elements recycles across companies for a reason. It's medium-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 an engineer who got tired of watching his cohort grind for six months and still get filtered at the OA stage. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Minimum Moves to Equal Array Elements interview FAQ
Is this problem actually medium difficulty?+
The 58 percent acceptance rate suggests it's correctly rated. Most failures come from candidates who simulate moves instead of recognizing the mathematical equivalence. Once you flip the perspective from incrementing-all-but-one to decrementing-one, it becomes a trivial sum. Difficulty is mostly pattern recognition.
Do Indeed and Coursera still ask this in real interviews?+
Yes, both companies have it in their reported question sets. It's a screening-phase problem, not a final-round one. It tests whether you can recognize a mathematical insight buried under an operational description. That's the skill they're assessing.
What's the actual trick I'm missing?+
Incrementing all elements except one is equivalent to decrementing that one element. The optimal target is the minimum element in the array. The answer is the sum of all differences between each element and the minimum. No simulation needed. Pure math.
How does this relate to the Array and Math topics?+
Array: you're iterating to find the minimum and sum differences. Math: the core insight is recognizing that incrementing-all-but-one equals decrementing-one, which collapses the problem to a single arithmetic formula. Both skills matter equally.
What's the time complexity I should quote?+
Linear time, one pass for the minimum, one pass for the sum of differences. Space is constant. If an interviewer pushes on why you don't simulate, your answer is the mathematical equivalence. That's the entire conversation.
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