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Grokking the Coding Interview Patterns in Python

Solution: Longest Consecutive Sequence

Explore how to find the longest consecutive sequence in an unsorted array by applying the Union Find pattern. Understand constructing data structures that group consecutive elements, then use union and find operations to merge sequences. This lesson helps you implement an efficient O(n) solution that tracks connected components to determine the longest sequence length.

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Statement

Given an unsorted array, nums, your task is to return the length of the longest consecutive sequence of elements. The consecutive sequence of elements is such that there are no missing elements in the sequence. The consecutive elements can be present anywhere in the input array.

Note: Two elements, xx and yy, are called consecutive if the difference between them is equal to 11.

Constraints:

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