Product-Based DSA Roadmap: Pattern Mastery
How to use: Focus on ONE pattern at a time. Do not move to the next pattern until you can solve the current pattern's problems without looking at the solution.
Phase 1: The Essentials (Arrays & Strings)
| Pattern | Problem Name | Difficulty | Link |
|---|---|---|---|
| Two Pointers Sorted arrays, Pairs |
Valid Palindrome | Easy | Solve |
| Squares of a Sorted Array | Easy | Solve | |
| Two Sum II - Input Array Is Sorted | Medium | Solve | |
| Container With Most Water | Medium | Solve | |
| 3Sum | Medium | Solve | |
| Trapping Rain Water | Hard | Solve | |
| Sliding Window Subarrays, Substrings |
Best Time to Buy and Sell Stock | Easy | Solve |
| Maximum Average Subarray I | Easy | Solve | |
| Longest Substring Without Repeating Characters | Medium | Solve | |
| Longest Repeating Character Replacement | Medium | Solve | |
| Minimum Window Substring | Hard | Solve | |
| Prefix Sum Range sums |
Product of Array Except Self | Medium | Solve |
| Subarray Sum Equals K | Medium | Solve | |
| Continuous Subarray Sum | Medium | Solve |
Phase 2: Hashing & Linked Lists
| Pattern | Problem Name | Difficulty | Link |
|---|---|---|---|
| Hash Maps / Sets Frequency, Lookups |
Two Sum | Easy | Solve |
| Valid Anagram | Easy | Solve | |
| Group Anagrams | Medium | Solve | |
| Longest Consecutive Sequence | Medium | Solve | |
| Fast & Slow Pointers Cycles, Middle finding |
Linked List Cycle | Easy | Solve |
| Middle of the Linked List | Easy | Solve | |
| Find the Duplicate Number | Medium | Solve | |
| Happy Number | Easy | Solve |
Phase 3: Standard Data Structures
| Pattern | Problem Name | Difficulty | Link |
|---|---|---|---|
| Binary Search Sorted, Rotated |
Binary Search | Easy | Solve |
| Search in Rotated Sorted Array | Medium | Solve | |
| Find Minimum in Rotated Sorted Array | Medium | Solve | |
| Koko Eating Bananas | Medium | Solve | |
| Monotonic Stack Next greater/smaller |
Next Greater Element I | Easy | Solve |
| Daily Temperatures | Medium | Solve | |
| Largest Rectangle in Histogram | Hard | Solve | |
| Intervals Merge, Overlap |
Merge Intervals | Medium | Solve |
| Insert Interval | Medium | Solve | |
| Non-overlapping Intervals | Medium | Solve |
Phase 4: Trees, Graphs & Heaps
| Pattern | Problem Name | Difficulty | Link |
|---|---|---|---|
| BFS / DFS (Trees) Level order, Depth |
Maximum Depth of Binary Tree | Easy | Solve |
| Invert Binary Tree | Easy | Solve | |
| Binary Tree Level Order Traversal | Medium | Solve | |
| Kth Smallest Element in a BST | Medium | Solve | |
| Graphs Islands, Networks |
Number of Islands | Medium | Solve |
| Rotting Oranges | Medium | Solve | |
| Clone Graph | Medium | Solve | |
| Top 'K' (Heaps) Priority Queue |
Kth Largest Element in an Array | Medium | Solve |
| K Closest Points to Origin | Medium | Solve | |
| Find Median from Data Stream | Hard | Solve |
Phase 5: Dynamic Programming
| Pattern | Problem Name | Difficulty | Link |
|---|---|---|---|
| 1D DP Subproblems |
Climbing Stairs | Easy | Solve |
| House Robber | Medium | Solve | |
| Coin Change | Medium | Solve | |
| Longest Increasing Subsequence | Medium | Solve | |
| Backtracking Permutations, Subsets |
Permutations | Medium | Solve |
| Subsets | Medium | Solve | |
| Combination Sum | Medium | Solve |
Next Step: Start Phase 1. Solve "Valid Palindrome" first!
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