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Learn Data Structures and Algorithms in Go

Problem: Longest Consecutive Sequence

Explore how to solve the longest consecutive sequence problem efficiently using hash tables for O(1) lookups. Understand the approach to identify sequence starts and count lengths with optimal O(n) time complexity while managing space with hash sets.

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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:

  • 0≤0 \leq nums.length ≤105\leq 10^5 ...