Identify the Right DSA Pattern in 30 Seconds
Stop memorizing 500 LeetCode solutions. Learn 29 patterns and recognize which one to use — instantly.
How It Works
Three steps to go from confused to confident on any DSA problem.
Read the Problem
Identify the input type (array, string, tree, graph) and what you are looking for (subarray, path, combination, ordering).
Follow the Decision Tree
Answer 3-5 simple yes/no questions about the problem constraints. Each answer narrows down the pattern space.
Apply the Pattern
Get the matching pattern with pseudocode, time complexity, key indicators, and example problems you can practice on.
29 Patterns in 7 Categories
Every pattern you need for coding interviews, organized by data structure and technique.
Array & String
5 patterns
Two Pointers, Sliding Window, Prefix Sum, Kadane's, Cyclic Sort
Hashing & Frequency
2 patterns
Hash Map Counting, Two Sum Pattern
Sorting & Searching
5 patterns
Binary Search, Merge Intervals, Top-K, Two Heaps, K-way Merge
Linked List
2 patterns
Fast & Slow Pointers, Linked List Reversal
Tree & Graph
5 patterns
BFS, DFS, Backtracking, Topological Sort, Union-Find
Dynamic Programming
6 patterns
0/1 Knapsack, Unbounded Knapsack, Fibonacci, LCS, DP on Trees
Advanced
4 patterns
Monotonic Stack, Trie, Bit Manipulation, Greedy
Everything You Need to Master Patterns
Tools designed to build real pattern recognition, not rote memorization.
Interactive Decision Tree
Follow a visual, step-by-step wizard that asks 3-5 targeted questions to pinpoint exactly which pattern solves your problem.
Animated Walkthroughs
Watch algorithms execute step-by-step on real data. See pointers move, windows slide, and trees traverse in real time.
Pattern Recognition Quiz
Read a problem description and identify the correct pattern. Build the intuition that separates good engineers from great ones.
Visual Cheat Sheet
All 29 patterns organized by category with key indicators, time complexity, and common problems at a glance.
Want All 29 Patterns with Detailed Walkthroughs?
Get the complete guide with in-depth explanations, animated visualizations, complexity analysis, and curated practice problems for every pattern.