https://leetcode.com/problems/longest-consecutive-sequence/description/ Longest Consecutive Sequence - LeetCode Longest Consecutive Sequence - Given an unsorted array of integers nums, return the length of the longest consecutive elements sequence. You must write an algorithm that runs in O(n) time. Example 1: Input: nums = [100,4,200,1,3,2] Output: 4 Explanati leetcode.com 문제 Given an unsorted ..