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Longest Arithmetic Subsequence (medium)
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Problem Statement

Given an array nums containing positive integers, return the maximum length of a subsequence that forms an arithmetic progression.

  • A subsequence is an array that can be formed from nums by deleting 0 or more elements without changing the order of the remaining elements.

  • An arithmetic progression (AP) is a sequence of numbers in which the difference between any two consecutive elements is constant. In short, seq[i + 1] - seq[i] should be same for all 0 <= i < seq.length - 2.

Examples

  • Example 1:
    • Input: [8, 12, 6, 4, 2]

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