500 Curated Problems

Every problem categorized by pattern, difficulty, and company. Each with video walkthrough and BASIC Framework solution.

500
Problems
500+
Videos
10+
Patterns
8+
Companies

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🔢 Arrays & Hashing

35 problems
Two SumEasy🔒
Contains DuplicateEasy🔒
Group AnagramsMedium🔒
Top K Frequent ElementsMedium🔒
Product of Array Except SelfMedium🔒

👆 Two Pointers

25 problems
Valid PalindromeEasy🔒
3SumMedium🔒
Container With Most WaterMedium🔒
Trapping Rain WaterHard🔒

🪟 Sliding Window

20 problems
Best Time to Buy and Sell StockEasy🔒
Longest Substring Without Repeating CharactersMedium🔒
Minimum Window SubstringHard🔒

📚 Stack & Queue

22 problems
Valid ParenthesesEasy🔒
Daily TemperaturesMedium🔒
Largest Rectangle in HistogramHard🔒

🔍 Binary Search

20 problems

🌳 Trees

40 problems

🕸️ Graphs

35 problems

🧩 Dynamic Programming

45 problems

🔄 Backtracking

28 problems

⚡ Greedy & Advanced

30+ problems

Full problem library unlocks May 5. Start now with 100 free practice problems or watch solutions on YouTube.