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Grokking the Coding Interview Patterns in C++

Solution: Longest Consecutive Sequence

Understand how to solve the longest consecutive sequence problem by treating consecutive numbers as connected components. Explore the Union Find data structure to efficiently merge sequences and track their sizes. This lesson helps you implement an optimized method with O(n) time complexity to identify the longest consecutive run in an unsorted array.

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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:

  • 0≤0 \leq nums.lengths ≤103\leq 10^{3}
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