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LeetCode Prep Insights

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

223 articles

How to Know Which Algorithm to Use on LeetCode (Pattern Decision Tree + Cheat Sheet)

Stop guessing. Use this 2-minute decision checklist and a cheat sheet of the 12 core algorithm patterns (with signals, templates, and common traps).

LeetCodeAlgorithmsInterview PrepProblem SolvingStudy StrategyCoding Patterns

David Ng

22 min

1/14/2026

How to Solve LeetCode Problems Faster: The Complete Speed Guide

Struggling with time on LeetCode? Here's how to improve your problem-solving speed with realistic benchmarks, targeted techniques, and a 4-week improvement plan.

LeetCodeSpeedInterview PrepProblem SolvingTechniquesPractice

David Ng

18 min

1/13/2026

What Order Should I Learn Data Structures and Algorithms? (The Complete Roadmap)

The right learning order makes DSA manageable. The wrong order leads to frustration. Here's the exact sequence that works, with time estimates for each phase.

Data StructuresAlgorithmsLearning PathDSAInterview PrepRoadmap

Alex Wang

20 min

1/13/2026

Best Programming Language for Coding Interviews in 2026 (Python vs Java vs C++)

Should you use Python, Java, or C++ for coding interviews? Here's the definitive answer based on interview experience, company preferences, and practical trade-offs.

Programming LanguagesPythonJavaC++Interview PrepLeetCode

David Ng

18 min

1/13/2026

Best Mock Interview Platforms in 2026: Free and Paid Options Compared

Mock interviews are the most underrated part of interview prep. Here's every platform compared—from free peer practice to $300/session professional coaching.

Mock InterviewsInterview PrepPrampInterviewing.ioCareerCoding Interviews

David Ng

20 min

1/12/2026

Senior Engineer Interview Preparation Guide (L5+ / Staff)

Senior and Staff engineer interviews are fundamentally different from junior roles. Here's how to prepare for L5+, including system design depth, leadership stories, and the bar that's actually being tested.

Senior EngineerStaff EngineerSystem DesignInterview PrepL5L6Career

Tianyi Chen

25 min

1/12/2026

How Long Does It Take to Prepare for Coding Interviews? (Realistic Timelines)

The honest answer depends on your background. Here are realistic timelines for different experience levels—from 2-week emergency plans to 12-week comprehensive prep.

Interview PrepLeetCodeStudy PlanTimelineCoding InterviewsCareer

Alice Ho

18 min

1/12/2026

Behavioral Interview Preparation: The Complete Guide (2026)

Most engineers fail behavioral interviews because they prepare wrong. Here's exactly how to prepare your stories, use the STAR method, and pass behavioral rounds at top tech companies.

Behavioral InterviewsSTAR MethodInterview PrepAmazonLeadership PrinciplesCareer

Alex Wang

22 min

1/12/2026

How to Choose the Right Coding Interview Prep Tool (2026 Guide)

This guide helps you identify your current stage and choose prep tools that actually work—without wasting time on the wrong ones.

Interview PrepStrategyDecision GuideLeetCodeCoding InterviewFAANG

Alex Wang

25 min

1/7/2026

LRU Cache (LeetCode 146): The Complete Guide to Solving It

LRU Cache is one of the most asked interview questions at FAANG. Here's how to solve it step-by-step with Hash Map + Doubly Linked List.

LeetCodeLRU CacheData StructuresHash MapLinked List

Alex Wang

12 min

1/6/2026