Leetcode 128. Longest Consecutive Sequence - Tricky Solution Using HashSet Explained In Detail

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Leetcode 128. Longest Consecutive Sequence
LintCode 124 Longest Consecutive Sequence

Tricky Solution Using HashSet Explained

Link To The Problem:

Problem Description:

Given an unsorted array num of integers, find the length of the longest consecutive elements sequence.

Your algorithm should run in O(n)O(n) complexity.

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