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Grokking the Coding Interview Patterns

4Sum

Explore how to identify and solve the 4Sum problem by finding unique quadruplets that sum to a target value. Learn to approach this challenge with an optimal O(n3) time complexity solution while understanding problem constraints, enhancing your problem-solving skills 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 ...