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Grokking the Coding Interview Patterns in C#

4Sum

Explore how to identify all unique quadruplets within an array that add up to a target value. This lesson helps you understand the 4Sum pattern, improve problem analysis skills, and implement an optimal solution using C# for coding 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 ...