Problem Statement
Find length of longest consecutive elements sequence.
Approach
Add all to set. For each number, check if it's sequence start (n-1 not in set), then count consecutive.
Time & Space Complexity
Time O(n), Space O(n).

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Use HashSet to find consecutive sequences efficiently.
Find length of longest consecutive elements sequence.
Add all to set. For each number, check if it's sequence start (n-1 not in set), then count consecutive.
Time O(n), Space O(n).
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