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Leetcode 2831. Find the Longest Equal Subarray
Given an array and at most k deletions, find the maximum length of a contiguous subarray that can be made constant (all equal) after removing ≤k elements — equivalently, for some value v find the longest window where at most k elements differ from v. This reduces to testing candidate values and using a sliding-window/counting strategy to maximize the equal-run length.
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