13/12/2025
Hey everyone! Back with another Java problem walkthrough. This time we’re tackling a classic — the Two-Sum problem. You know, the one where you’re given an array and a target number, and you have to find which two numbers add up to that target. It sounds simple, but it trips up a lot of people starting out.
In this video, I’ll walk you through my thought process while solving it step by step. We’ll start by breaking down the problem, then I’ll show you how to set up the loops properly to avoid using the same element twice (a common mistake!). I’ll also talk about why a simple approach like this works, even if it’s not the fanciest or fastest.
At the end, I’ll run the code with some test cases to make sure it really works. Stick around to see if you can spot how we could improve this solution next time — hint: there’s a much quicker way if we use a different data structure!
If this helped you, give it a thumbs up 👍 and drop a comment below if you’ve seen this problem in an interview or exam! Don’t forget to subscribe and hit the bell so you don’t miss the next one.
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Two Sum Problem Java Solution - LeetCode #1 Tutorial (Step by Step)