Leetcode Problem 1027. Longest Arithmetic Subsequence

1027. Longest Arithmetic Subsequence

Leetcode Solutions

Dynamic Programming Approach for Longest Arithmetic Subsequence

  1. Initialize a 2D array dp to store the maximum length of subsequence that ends at index right with a common difference of diff.
  2. Iterate over the array with two nested loops, with indices right and left where left < right.
  3. Calculate the common difference diff = nums[right] - nums[left].
  4. Update dp[right][diff] to be the maximum of its current value and dp[left][diff] + 1.
  5. Keep track of the maximum length found during the iteration.
  6. Return the maximum length found.
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Brute Force Approach for Longest Arithmetic Subsequence

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