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LeetCode Prep Insights

Practical guides, tips, and stories on coding interviews and smarter LeetCode practice with AI.

215 articles

How to Review LeetCode Mistakes After Solving Problems: A System for Real Learning

Solving problems is only half the battle. What you do in the 10–15 minutes after a LeetCode question determines whether you actually improve. Here’s a simple, repeatable review system.

LeetCodeLearning StrategyMistakesStudy HabitsInterview Prep

LeetCopilot Team

15 min

12/1/2025

When to Look at LeetCode Solutions Without Hurting Your Learning

45 minutes stuck, cursor hovering over the solution. Here are the exact time thresholds and decision criteria.

Learning StrategyProblem solvingInterview prepStudy techniquesMental approach

David Ng

12 min

12/1/2025

How to Practice Graph Problems on LeetCode for Beginners: A Structured Roadmap

Graphs feel overwhelming if you jump in randomly. This roadmap walks LeetCode beginners through a staged, pattern-first way to master graph problems without getting lost.

LeetCodeGraphsBFSDFSPractice Strategy

LeetCopilot Team

16 min

11/30/2025

How to Convert a Recursive Solution to Iterative on LeetCode Using a Stack

Interviewers often ask you to rewrite a recursive solution iteratively—but most tutorials don’t show a systematic way to do it. Learn how to simulate recursion with a stack step by step.

LeetCodeRecursionIterationStacksInterview Prep

LeetCopilot Team

15 min

11/29/2025

How to Know When Dynamic Programming Is Needed

Stop guessing. Learn the exact signals that tell you a problem requires DP before you waste 30 minutes on a brute-force solution.

Dynamic ProgrammingPattern RecognitionProblem SolvingInterview StrategyAlgorithms

Sarah Chen

9 min

11/28/2025

What to Do When You Don't Understand a LeetCode Problem

Can't even start because the problem statement is confusing? Follow this 5-step framework to go from 'huh?' to 'I get it' in 10 minutes.

Problem SolvingBeginner GuideReading ComprehensionLeetCode TipsInterview Prep

David Ng

8 min

11/28/2025

How to Practice LeetCode Without Memorizing Solutions

Worried you're just memorizing patterns instead of learning? Use this deliberate practice framework to build real problem-solving skills that transfer to new problems.

Learning StrategyPattern RecognitionSpaced RepetitionDeliberate PracticeLeetCode Tips

Sean Luo

10 min

11/28/2025

Two Pointers Intuition for LeetCode Beginners: A Step-by-Step Visual Guide

Two pointers show up everywhere on LeetCode, but many beginners memorize patterns without understanding why they work. This guide builds your intuition with diagrams, examples, and a reusable decision process.

LeetCodeTwo PointersAlgorithm PatternsArraysInterview Prep

Alex Wang

15 min

11/28/2025

Prefix Sum Technique on LeetCode for Beginners: From Intuition to Patterns

Prefix sums turn many O(n²) subarray problems into clean O(n) solutions. Learn the intuition, common patterns, and mistakes LeetCode beginners make when using prefix sums.

LeetCodePrefix SumArraysAlgorithm PatternsInterview Prep

David Ng

15 min

11/28/2025

How to Run Mock Coding Interviews by Yourself with LeetCode

No study buddy? No coach? You can still simulate realistic coding interviews on your own. Learn how to structure solo mock interviews using LeetCode and simple tools.

LeetCodeMock InterviewsPractice StrategyInterview PrepSelf-Study

Alex Wang

16 min

11/28/2025