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Problem: Longest Consecutive Sequence

Explore how to determine the longest consecutive sequence in an unsorted integer array by leveraging hash sets for O(1) lookups. Understand key optimizations that ensure linear time complexity, and implement a solution in JavaScript that effectively handles duplicate entries and scales to large input sizes.

Statement

Given an unsorted array of integers nums, determine the length of the longest sequence of consecutive elements that can be formed from the values in the array.

Your solution must operate in O(n)O(n) time complexity.

Constraints:

  • 00 \leq nums.length 105\leq 10^5

  • 109 ...