@alexwang24

Alex Wang

@alexwang24Joined December 2025

Builder of LeetCopilot, an AI assistant to help you master LeetCode and coding interviews

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LeetCopilot Blogleetcopilot.hashnode.dev223 posts

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AWAlex Wangleetcopilot.hashnode.devMar 20 · 8 min read

10 Best Mock Interview Platforms in 2026 (Free & Paid)

Originally published on LeetCopilot Blog From free peer practice to expert FAANG engineers, these mock interview platforms will help you ace coding, behavioral, and system design interviews in 2025. Mock interviews are the closest thing to real in...

AWAlex Wangleetcopilot.hashnode.devMar 19 · 14 min read

12 Best LeetCode Alternatives in 2026 (Free & Paid)

Originally published on LeetCopilot Blog Tired of LeetCode grinding? Here are the best alternatives for coding interview prep—from free platforms like NeetCode and HackerRank to structured courses like AlgoMonster. I've spent $600+ on coding inter...

AWAlex Wangleetcopilot.hashnode.devMar 10 · 24 min read

Best Free Coding Interview Prep Resources in 2026 (Complete List)

Originally published on LeetCopilot Blog You don't need to spend hundreds on interview prep. Here are the best free resources for DSA, system design, and behavioral interviews. I spent $847 on interview prep courses before realizing this: 95% of w...

AWAlex Wangleetcopilot.hashnode.devMar 5 · 4 min read

These Hash Map Counting Mistakes Are Costing You Easy Points

Originally published on LeetCopilot Blog Frequency counting should be the easy part. If you keep losing points to off-by-one counts and missing keys, here's what's going wrong. Counting with hash maps should be easy, yet many submissions fail beca...

AWAlex Wangleetcopilot.hashnode.devMar 4 · 4 min read

DP State Transitions: How to Design Tables That Actually Work

Originally published on LeetCopilot Blog DP feels abstract until you can see the table fill itself. Here's a repeatable rehearsal flow that lands in interviews. DP feels abstract until you can see the table fill itself. This guide keeps the focus ...

Alex Wang

About

Available for

Alex Wang's blogs

Recently published

10 Best Mock Interview Platforms in 2026 (Free & Paid)

12 Best LeetCode Alternatives in 2026 (Free & Paid)

Best Free Coding Interview Prep Resources in 2026 (Complete List)

These Hash Map Counting Mistakes Are Costing You Easy Points

DP State Transitions: How to Design Tables That Actually Work

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Alex Wang

About

Available for

Alex Wang's blogs

Recently published

10 Best Mock Interview Platforms in 2026 (Free & Paid)

12 Best LeetCode Alternatives in 2026 (Free & Paid)

Best Free Coding Interview Prep Resources in 2026 (Complete List)

These Hash Map Counting Mistakes Are Costing You Easy Points

DP State Transitions: How to Design Tables That Actually Work