Cracking 3Sum: Python Solution & Logic Explained

Published: 01 July 2026
on channel: AlexS

Struggling to wrap your head around the 3Sum problem? You're not alone! In this video, I break down the 3Sum algorithm using Python in the simplest way possible. Whether you are prepping for a coding interview or just trying to improve your algorithmic thinking, this step-by-step guide is for you.

3Sum is very similar to Two Integer Sum II with just a few minor adjustments. If you’ve already solved that problem, 3Sum will come much easier to you than just solving it blind.

This is exactly why pattern recognition is so important in competitive programming, most LeetCode problems are designed to build upon one another. By mastering the core two-pointer technique, you unlock the ability to solve a wide variety of array-based problems.

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