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Leetcode 1838. Frequency of the Most Frequent Element
Given you can spend up to k unit increments to raise elements, maximize how many elements can be made equal by choosing a target value and increasing smaller elements to it; after sorting, this becomes finding the longest window where the cost to raise all values to the window's max is ≤ k. The typical solution uses a two-pointer/sliding-window check (with running sums) to test feasibility efficiently.
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