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This tutorial walks through Data Structures & Algorithms in a carefully structured progression — entirely in Swift:

🧮 Foundations

1. Big-O Notation

🧱 Data Structures

1. Arrays & Strings
2. Hash Maps & Hash Sets
3. Linked Lists
4. Stacks
5. Queues & Deques
6. Binary Trees
7. Binary Search Trees
8. Heaps & Priority Queues
9. Tries
10. Graphs
11. Union-Find
12. Segment & Fenwick Trees

🧩 Patterns

1. Two Pointers
2. Sliding Window
3. Fast and Slow Pointers
4. Binary Search
5. DFS and Backtracking
6. BFS
7. Topological Sort
8. Union-Find Pattern
9. Monotonic Stack
10. Prefix Sum
11. Merge Intervals
12. Top-K and Heap Pattern
13. 1D Dynamic Programming
14. 2D Dynamic Programming
15. Greedy
16. Matrix Traversal
17. Bit Manipulation Tricks

🎯 NeetCode 150

Arrays & Hashing

1. Contains Duplicate
2. Valid Anagram
3. Two Sum
4. Group Anagrams
5. Top K Frequent Elements
6. Product of Array Except Self
7. Valid Sudoku
8. Encode and Decode Strings
9. Longest Consecutive Sequence

Two Pointers

1. Valid Palindrome
2. Two Sum II - Input Array Is Sorted
3. 3Sum
4. Container With Most Water
5. Trapping Rain Water

Sliding Window

1. Best Time to Buy and Sell Stock
2. Longest Substring Without Repeating Characters
3. Longest Repeating Character Replacement
4. Permutation in String
5. Minimum Window Substring
6. Sliding Window Maximum

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By following this path, you'll go from:

👉 "I memorized 150 answers 😵" to 👉 "I recognize the pattern before I finish reading the problem 💡"