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Interview Prep · cloudaqube · intermediate

Mastering LeetCode Patterns (Python)

Stop memorizing solutions and start recognizing patterns. This course covers three essential patterns: Arrays & Hashing, Sliding Window / Two Pointers, and Fast & Slow Pointers — implemented in Python. You will learn to identify the right approach by reading a problem description and apply clean, optimal solutions in interviews. Additional patterns including BFS/DFS, Heaps, and Binary Search are coming soon.

  • 6 hours
  • 8 lessons
  • 3 modules
  • updated April 2026
Module 1 freeNo credit cardFull course from $8.99/mo
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Read a full lesson from Module 1. No account needed.

free lesson · read · 45 min

The Hash Map: Your Most Powerful Tool

Hashing allows for O(1) average time complexity for lookups, insertions, and deletions. In interviews, if you see a problem requiring lookups, a Hash Map (Dictionary in Python) is almost always the answer. The brute…
curriculum

3 modules, 8 lessons

Module 1 is free — lessons, hands-on walkthrough and quiz.

  • readThe Hash Map: Your Most Powerful Tool45 min
  • videoVideo: Arrays & Hashing Roadmap30 min
  • hands-onHands-on: Implementing Group Anagrams60 min
how it's built

Built by the CloudaQube team

No celebrity instructor — here is exactly what goes into the course instead.

  • 01 2 guided hands-on walkthroughs you run in a real environment.
  • 02 Last updated April 2026.
  • 03 Any module can become a hands-on lab in Labs Studio.
outcomes

What you'll be able to do

  • 01 Identify the correct algorithmic pattern just by reading a problem description
  • 02 Master Two Pointers and Sliding Window techniques for optimal O(N) solutions
  • 03 Implement Fast & Slow pointer patterns for Linked List and Cycle detection
  • 04 Apply the Two Pointers pattern to solve in-place array and string problems in O(N) time
  • 05 Detect cycles and find middle elements in Linked Lists using Fast & Slow Pointers
before you start
  • — Solid understanding of Python syntax (Lists, Dicts, Sets)
  • — Basic understanding of Big O notation (Time and Space complexity)
questions

Before you start

How long does it take?

About 6 hours of lessons, videos and hands-on walkthroughs across 3 modules.

What’s free?

Module 1 in full — lessons, hands-on walkthrough and quiz — with no card required. Any paid plan (from $8.99/mo) unlocks all 3 modules, and starts with a 14-day free trial.

get started

Start the course with Module 1 free.

No card required. Unlock every module from $8.99/mo when you’re ready.

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