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4Sum

Explore how to identify all unique quadruplets in an integer array that sum to a given target, and implement an optimal O(n^3) time solution. Understand the logic behind the problem and practice coding in a hands-on environment to enhance your algorithm skills.

Statement

Given an array nums of nn integers, return an array of all the unique quadruplets, [nums[a], nums[b], nums[c], nums[d]] such that:

  • 00 \leq a, b, c, d <n< n ...