Apply Operations to Maximize Frequency Score
A hard-tier problem at 36% community acceptance, tagged with Array, Binary Search, Sliding Window. Reported in interviews at Deutsche Bank and 1 others.
You're sitting in a live assessment and get hit with Apply Operations to Maximize Frequency Score. It's hard, acceptance rate is 36%, and Deutsche Bank and PhonePe both ask it. The problem looks like a greedy optimization game at first glance, but the real pattern is buried in prefix logic and binary search. Most candidates stall because they chase the obvious approach and don't spot the frequency constraint. If you haven't drilled this specific combination of Array, Sorting, Prefix Sum, and Binary Search, StealthCoder runs invisibly during your screen share and surfaces the working solution in seconds so you don't burn interview time spinning.
Companies that ask "Apply Operations to Maximize Frequency Score"
Apply Operations to Maximize Frequency Score 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 trap is thinking this is purely greedy. You'll start rearranging elements and hit a wall because the frequency requirement cuts off most naive paths. The actual solution leans hard on Sliding Window paired with Prefix Sum to track cost efficiently, then Binary Search to find the maximum valid window where all elements can be made equal within budget. Most people don't see the connection between frequency constraints and sorted array windows until they've been stuck for ten minutes. The cost calculation itself is the knife's edge: off-by-one or a missed edge case and your binary search returns wrong bounds. This is exactly the kind of problem where the algorithm is sound but implementation kills you during live OA pressure. StealthCoder hedges that moment, showing you the exact structure so you can code faster and nail the details.
Pattern tags
You know the problem.
Make sure you actually pass it.
Apply Operations to Maximize Frequency Score recycles across companies for a reason. It's hard-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.
Apply Operations to Maximize Frequency Score interview FAQ
Is this problem as hard as the 36% acceptance rate suggests?+
Yes. It combines five topics and requires you to see that frequency maximization only works inside a sorted sliding window. The cost calculation is a common pitfall. Most attempts get the binary search frame right but fail on window validity or prefix sum boundaries.
Will I see this at Deutsche Bank or PhonePe if I apply?+
Both companies have asked it. It's not universally common, but if you're prepping for either, this specific problem matters. Other candidates will have seen it. You should too.
How do Sorting and Prefix Sum connect to the sliding window here?+
Sort the array first. Prefix Sum lets you compute range costs in O(1). The sliding window defines a contiguous range of equal target values, and Binary Search finds the largest valid window where total cost to equalize stays within budget.
What's the most common mistake on this problem?+
Miscalculating the cost to make all elements in a window equal to the median or middle value. Edge cases where the window is one element, or off-by-one errors in prefix sum indexing, also tank submissions.
Should I grind this before an OA or use it as a safety net?+
If you're interviewing at Deutsche Bank or PhonePe, drilling this once is worth it. But even if you've practiced, live pressure makes the implementation tricky. StealthCoder is your hedge if the pattern doesn't click in real time.
Want the actual problem statement? View "Apply Operations to Maximize Frequency Score" on LeetCode →