3 Sum – Triplet Sum in Array

To find a triplet in an array that sums to a target, various approaches can be used. The naive approach generates all possible triplets and checks if their sum equals the target, with a time complexity of O(n^3). A better approach leverages a hash set to store potential complements while iterating, reducing the time complexity to O(n^2) and requiring O(n) space.

The most efficient method uses sorting and the two-pointer technique, achieving O(n^2) time complexity with O(1) space. After sorting, the array is traversed, and for each element, two pointers identify a pair that sums to the required value. This approach ensures a quick and space-efficient solution to finding triplets with the desired sum.

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