Leetcode 3202. Find the Maximum Length of Valid Subsequence II

Find the longest subsequence (order preserved) of nums such that every adjacent pair sum has the same remainder modulo k. This reduces to a DP/greedy over possible target remainders, tracking for each remainder the best subsequence length you can end with given the last element's residue.

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Leetcode 3202. Find the Maximum Length of Valid Subsequence II

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