Longest Consecutive Sequence
Given an unsorted array of integers Find the length of the longest consecutive elements sequence Must run in O(n) time Example: [100,4,200,1,3,2] => 4 (sequence is [1,2,3,4])
Under the hood, Longest Consecutive Sequence is about traversing relationships without getting trapped in cycles. Interviewers love it because it reveals your modeling relationships and your edge-case discipline. Be careful with cycles and disconnected pieces; a missing visited rule can blow up quickly.
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