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Longest Consecutive Sequence

Hard

00:00

0 users online

Find length of longest consecutive elements sequence.

Sample Input:

[100,4,200,1,3,2]

Sample Output:

Hints

Hint 1

Use hash set for O(1) lookups

Hint 2

Only start counting from sequence beginnings

Hint 3

Check if num-1 exists to find start

Code Editor

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