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Leetcode 2501. Longest Square Streak in an Array
Find the maximum length (≥2) subsequence of nums whose elements, when sorted, form a chain a, a^2, a^4, ... (each element is the square of the previous); return -1 if no such subsequence exists. The challenge is to match values to their squared successors while respecting original index order efficiently for n up to 1e5.
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