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Solution: Longest Consecutive Sequence

Explore solving the longest consecutive sequence in an unsorted array by applying the union find algorithm. Understand how to merge consecutive elements into connected components, maintain component sizes, and achieve an optimal O(n) time solution.

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Statement

Given an unsorted array, nums, your task is to return the length of the longest consecutive sequence of elements. The consecutive sequence of elements is such that there are no missing elements in the sequence. The consecutive elements can be present anywhere in the input array.

Note: Two elements, xx and yy, are called consecutive if the difference between them is equal to 11.

Constraints:

  • 0≤0 \leq nums.lengths ≤103\leq 10^{3}
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