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Given an array where you may repeatedly remove either the first two, the last two, or the first and last elements, maximize how many such pair-removals can be performed so every removed pair has the same sum. Equivalently, determine for each possible target pair-sum how many disjoint end-pairings can be formed under the allowed end-removal rules and return the maximum.
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Leetcode 3040. Maximum Number of Operations With the Same Score II
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