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[Python] Coding Interview Patterns: Unpublished Lessons

Solution: 4Sum

Let’s solve the 4Sum problem using the Two Pointers pattern.

We'll cover the following...

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 ...