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Grokking the Coding Interview Patterns in C++

4Sum

Explore the 4Sum coding challenge to understand how to identify unique quadruplets in an integer array that sum to a specific target. This lesson develops your skills to implement an optimal O(n^3) time and O(n) space solution, enhancing your problem-solving abilities for technical interviews.

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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:

  • 0≤0 \leq a, b, c, d <n< n ...