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Problem: Longest Consecutive Sequence

Explore how to determine the longest consecutive sequence in an unsorted array by leveraging hash tables in C#. Learn to implement a solution that efficiently handles data with O(n) time complexity, using hash set membership checks and sequence counting techniques to optimize performance.

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

  • ...