Stop Solving Hundreds of Coding Questions, Learn the Patterns Instead

1. You Don't Need 500 Problems

Suppose you understand 20 major patterns. If you solve even 4–5 carefully chosen problems for each pattern, that's roughly:

20 patterns × 5 problems = 100 problems

One hundred well-understood problems can be far more valuable than 500 random problems that you barely remember.

The number isn't the goal.

Recognition is the goal.

You want to reach a point where you read a new problem and think:

"I've never seen this exact question before, but I know what kind of problem this is."

2. So, How Should You Actually Prepare?

Instead of doing this:

Problem → Solution → Next Problem → Next Problem → Forget everything

Try this:

Pattern → Understand the idea → Solve a few problems → Recognize variations → Move to the next pattern

3. The ~20 Coding Patterns Worth Learning

Instead of memorizing hundreds of problems, learn the ~20 recurring patterns—once you recognize the pattern behind a question, the approach follows naturally.

Each pattern includes:

• What it is—the core idea.
• When to use it—the signals/clues in a problem statement that point to this pattern.
• How to use it—the general approach/steps to apply it.
• Importance— a ⭐ rating (out of 5) reflecting how frequently it appears in interviews.
• Company tags—where this pattern's questions are commonly reported.
• Example questions—representative problems (statements only—no answers, no code).

Build Your Mental Toolbox

Think of coding patterns as tools. You don't become a better carpenter by memorizing 500 different pieces of furniture.

You become better by understanding your tools and knowing when to use each one.

Coding interviews are similar. You don't need to memorize hundreds of solutions. You need to build a strong set of problem-solving techniques and become comfortable recognizing when to use them.

So the next time you open LeetCode, don't ask:

"Which problem should I solve next?"

Ask:

"Which pattern am I learning today?"

That small change can make your preparation much more focused, structured, and enjoyable.

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