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Grokking the Coding Interview Patterns in Go

4Sum

Explore how to solve the 4Sum problem, returning all unique quadruplets in an array that add up to a target value. Understand constraints and optimize your approach with O(n³) time complexity. Develop skills for tackling advanced coding interview questions independently.

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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 ...