Striver's A2Z DSA Sheet — Complete Solutions Guide & Interactive Practice

The definitive interview preparation companion for Striver's A2Z DSA Sheet.
Complete C++ optimal solutions catalog, 390-page offline PDF study guide, and interactive practice tracker.

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⚡ Quick Links

• 🌐 Live Web Application & Solved Tracker: https://avinash893.github.io/dsa-scraper/
• 📥 Download Offline PDF Guide (390 Pages): striver_better_optimal_solutions.pdf
• 🐙 GitHub Repository: https://github.com/avinash893/dsa-scraper

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📖 What's Inside the 390-Page PDF Study Guide?

The study guide (striver_better_optimal_solutions.pdf) is specifically formatted for high-efficiency interview revision and competitive programming prep:

• 📐 1-Question-1-Page Format: Every question and its full solution are self-contained on exactly one page (389 problems across 390 pages with zero text overflows).
• 🎯 Better & Optimal Approaches Only: Skips repetitive brute-force methods to focus exclusively on production-grade interview solutions.
• 🎨 LeetCode Dark Editor Theme: Full C++ syntax highlighting (VS Code / LeetCode Dark Plus palette) with unescaped symbols (#include <bits/stdc++.h>, cout << "...").
• ⚖️ Side-by-Side Tradeoffs: Questions featuring both Better and Optimal solutions present them side-by-side in a 2-column layout for comparison.
• 📝 Complete Context: Each page includes the question title, difficulty badge, direct practice links (LeetCode / Article), problem statement with sample inputs/outputs, and time & space complexity.

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💻 Web Application Features

You can also run or practice directly in your browser:

1. 🎲 Practice Random Question: Hit the randomizer to pick an unsolved question from Striver's sheet, prioritizing weak spots.
2. ✅ Persistent Solved Checkmarks: Track your daily progress with checkmarks saved in browser localStorage.
3. 🔍 Instant Search & Filter: Filter all 474 problems by difficulty (Easy, Medium, Hard) or topic keyword.
4. 📦 One-Click Export: Download a .zip archive containing the solutions structured into categorized folders or download the single-file PDF.

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🗺️ Topic Roadmap (Sorting to Advanced)

The study guide and crawler cover all major topics starting from fundamental sorting techniques through advanced data structures and dynamic programming:

#	Topic Name	Problems	Key Algorithms & Patterns
01	Sorting Techniques	7	Selection, Bubble, Insertion, Merge, Quick Sort, Recursive Sorts
02	Arrays (Easy, Medium, Hard)	40	Kadane's, Two Sum, Dutch National Flag, Boyer-Moore, 3-Sum, 4-Sum, Inversion Count
03	Binary Search	32	Lower/Upper Bound, Search in Rotated Array, Search Space Reduction, Median of 2 Arrays
04	Strings	24	Anagrams, Isomorphic, Longest Palindrome, KMP, Z-Function
05	Linked Lists	31	Singly & Doubly LL, Floyd's Cycle Detection, Reverse in K-Groups, Flattening
06	Recursion & Backtracking	25	Subsets, Permutations, Combination Sum, N-Queens, Sudoku Solver, Palindrome Partitioning
07	Bit Manipulation	18	XOR Operations, Power Sets, Single Number, Counting Bits
08	Stacks & Queues	30	Monotonic Stack, Next Greater/Smaller, Trapping Rainwater, LRU & LFU Cache
09	Sliding Window & 2-Pointers	12	Longest Substring Without Repeating, Fruit Baskets, Subarrays with K Distinct
10	Heaps & Priority Queues	17	Min/Max Heap, Kth Largest, Merge K Sorted Lists, Median from Data Stream
11	Greedy Algorithms	15	Activity Selection, N Meetings in One Room, Job Scheduling, Jump Game, Candy
12	Binary Trees	38	Traversals (Pre/In/Post/Level), Height, Diameter, LCA, Boundary & Vertical Traversal
13	Binary Search Trees (BST)	16	Floor/Ceil, Validate BST, LCA in BST, BST Iterator, Construct from Preorder
14	Graphs	53	BFS, DFS, Dijkstra, Bellman-Ford, Floyd-Warshall, Prim's, Kruskal's, Disjoint Set Union (DSU)
15	Dynamic Programming	55	1D, 2D Grid, Subsets, Longest Common Subsequence (LCS), LIS, Matrix Chain Multiplication
16	Tries	7	Prefix Tree Implementation, Auto-complete, Maximum XOR of Two Numbers

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🛠️ Local Development & Scraper Execution

To run the local scraper bot and Express dashboard:

# 1. Clone repository
git clone https://github.com/avinash893/dsa-scraper.git
cd dsa-scraper

# 2. Install dependencies
npm install

# 3. Start local development server
npm start

Visit http://localhost:3005 in your browser.

To regenerate the study guide PDF locally:

python generate_striver_study_guide.py

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🤝 Contributing & Star

If you find this repository and study guide helpful for your technical interview preparation:

• Give it a ⭐ Star on GitHub to help others find it!
• Share it with fellow developers and study groups.
• Contributions, corrections, and improvements are always welcome via Pull Requests.

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📄 License

This project is open-source under the MIT License. Problem descriptions and reference materials belong to takeuforward.org.