A comprehensive Java library of 150 core algorithms
for Competitive Programming, LeetCode, and SDE 1/2/3 interview preparation.

About • Structure • Categories • Why • Tech Stack • Content • Support

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🔥 About

This repository contains a carefully structured collection of 150 essential algorithms implemented in Java.

Built for

🏆 Competitive Programming	Codeforces, AtCoder, CodeChef, etc.
💻 LeetCode & Coding Platforms	Pattern-driven problem solving
🎯 Technical Interviews	SDE 1 / SDE 2 / SDE 3
📈 Long-term Mastery	Data Structures & Algorithms

Every implementation focuses on

• ✨ Clean structure
• ⚡ Optimal time & space complexity
• 🔁 Reusability for contests
• 🧑‍💻 Interview-ready coding standards

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📂 Project Structure

CP-Core-Algorithms-150/
└── src/main/java/org/algos/
    ├── Arrays
    ├── SearchingAndSorting
    ├── Strings
    ├── Stacks
    ├── QueueAndDeque
    ├── LinkedList
    ├── Trees
    ├── Graphs
    ├── DynamicProgramming
    ├── Greedy
    ├── RecursionORBacktracking
    ├── MathORNumberTheory
    ├── BitManipulation
    └── AdvancedAndRare

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🧠 Categories Covered

Category	What's Inside
🔢 Arrays	Prefix Sum, Two Pointers, Sliding Window, Kadane's Algorithm, Subarray problems
🔍 Searching & Sorting	Binary Search Variations, Merge Sort, Quick Sort, Custom Comparator usage
🌐 Graphs	BFS, DFS, Dijkstra, Bellman-Ford, Floyd-Warshall, Topological Sort, DSU, MST
🧠 Dynamic Programming	0/1 Knapsack, LIS, LCS, Matrix DP, Digit DP, Bitmask DP
🌳 Trees	Binary Tree Traversals, BST operations, LCA, Segment Tree, Fenwick Tree
🧮 Math & Number Theory	Sieve of Eratosthenes, GCD, Modular Arithmetic, Fast Power, Combinatorics
⚙️ Bit Manipulation	Bitmasking techniques, Subset generation, XOR patterns
🔁 Recursion & Backtracking	Permutations, Combinations, N-Queens, Subsets, Constraint search problems
💡 Greedy	Activity Selection, Interval Scheduling, Greedy proof-based solutions
📚 Stack / Queue / LinkedList	Monotonic Stack, Deque optimization, Classic Linked List operations
🧪 Advanced & Rare	Advanced data structures and specialized competitive programming techniques

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🎯 Why This Repository?

• ✅ 150 battle-tested algorithms
• ✅ Structured, category-wise organization
• ✅ CP + LeetCode + Interview focused
• ✅ Clean and reusable Java implementations
• ✅ Built for serious problem solvers

This repository serves as 📘 a Competitive Programming revision handbook, 💼 an interview preparation toolkit, and 🚀 a long-term algorithm mastery project.

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🛠 Tech Stack

• Language: Java
• Focus: Performance + Clarity
• Structure: Competitive Programming oriented
• Scalability: Designed to expand beyond 150

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📺 Learning & Content

For structured explanations and algorithm deep-dives:

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⭐ Support

If this repository helps you:

• ⭐ Star the repo
• 🍴 Fork it
• 📣 Share it
• 🚀 Use it in your CP journey

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🚀 Keep Grinding. Keep Building. Keep Winning.