Leetcode Problem 873. Length of Longest Fibonacci Subsequence

873. Length of Longest Fibonacci Subsequence

Leetcode Solutions

Initialize a hashmap dp to store the length of the longest subsequence ending with elements at indices i and j.
Iterate over all pairs of indices (i, j) where i < j.
For each pair (i, j), search for an index k such that arr[i] + arr[j] == arr[k] using binary search or a set.
If such a k exists, update dp[j, k] to be dp[i, j] + 1 or 3 if (i, j) is not in dp.
Keep track of the maximum length found during the iteration.
Return the maximum length, or 0 if no Fibonacci-like subsequence is found.

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