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Longest Consecutive Sequence (medium)
Problem Statement
Given an unsorted array of integers, find the length of the longest consecutive sequence of numbers in it. A consecutive sequence means the numbers in the sequence are contiguous without any gaps. For instance, 1, 2, 3, 4 is a consecutive sequence, but 1, 3, 4, 5 is not.
Examples

 Input: [10, 11, 14, 12, 13]
 Output: 5
 Justification: The entire array forms a consecutive sequence from 10 to 14.

 Input: [3, 6, 4, 100, 101, 102]
 Output: 3
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