LeetCode Problem Solving — ELI5

Imagine you are training for a sport. You would not just play random games all day — you would practice specific drills. Dribbling. Passing. Shooting. Each drill builds a skill you use in the real game.

LeetCode is like a gym for coding. It gives you small puzzles that each test a specific skill. The goal is not to solve every puzzle ever made — it is to practice until the core skills feel natural.

Here is how it works. You get a problem like: “Given a list of numbers, find two that add up to 10.” You write Python code that solves it, hit submit, and the site tells you if your answer is correct and how fast it runs.

Why do people do this? Because tech companies use similar puzzles in job interviews. Google, Amazon, Meta — they all ask questions that look a lot like LeetCode problems. Practicing helps you recognize what kind of puzzle you are looking at and how to solve it quickly.

The beginner trap. New people often start with hard problems, get stuck for hours, feel terrible, and quit. That is like trying to bench press 200 pounds on your first gym visit. Start with Easy problems. Do lots of them. Build confidence.

The smart approach:

1. Try the problem for 15-20 minutes. Really think about it. Draw pictures. Try small examples by hand.
2. If you are stuck, read the solution. This is not cheating — it is learning. You cannot discover every technique on your own.
3. Understand WHY the solution works. Do not just memorize the code. Understand the idea behind it.
4. Redo it from scratch the next day. If you can solve it without looking, you actually learned it.

The big secret: There are only about 10-15 types of puzzles. Once you have seen each type a few times, new problems start feeling familiar. It is like learning that most songs use the same few chord progressions.

One thing to remember: LeetCode is practice, not a test of your worth as a programmer. Being stuck is normal. Looking at solutions is learning. Getting faster takes time, not talent.