Data-Structures-And-Algorithms-Java

A daily Java-based Data Structures and Algorithms (DSA) learning journey from basics to advanced, with real-world examples, detailed logic, and interview-focused solutions.

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📘 Data Structures and Algorithms in Java – Daily Learning Journey

Welcome to my personal repository where I’m learning and practicing Data Structures and Algorithms (DSA) using Java, step-by-step — from basic to advanced.
This is a daily journey to build strong problem-solving skills and prepare for top product-based companies.

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📅 Daily Progress Overview

Day	Topics Covered	Status
1	DSA Introduction, What & Why, Real-Time Use	✅ Completed
2	Primitive & Abstract DS, Algorithms, Basics	✅ Completed
3	Arrays Introduction, Logic Building Starts	🔄 Ongoing

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🧠 Topics To Be Covered (Java DSA Roadmap)

This roadmap follows the structure required to crack interviews at top tech/product-based companies.

✅ Java Fundamentals (Quick Revision)

• Variables, Data Types, Operators
• Control Flow (if-else, switch)
• Loops (for, while, do-while)
• Functions and Parameters
• OOP Concepts: Class, Object, Inheritance, Polymorphism, Abstraction, Encapsulation
• Constructors
• this & super keywords
• Access Modifiers, Packages
• Arrays, Strings, Exception Handling

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✅ DSA Core Topics

📦 Arrays

• Traversal, Insertion, Deletion
• Min/Max Element, Reverse, Rotate
• Prefix Sum, Difference Array
• Sliding Window
• Kadane’s Algorithm

🔠 Strings

• StringBuilder & StringBuffer
• Palindrome, Anagram
• Substrings, Pattern Matching
• Frequency Map
• String Compression

🔁 Recursion & Backtracking

• Basic Problems (Factorial, Fibonacci)
• Reverse Number/String
• Subsets, Permutations
• N-Queens Problem
• Sudoku Solver

📊 Sorting Algorithms

• Bubble, Selection, Insertion Sort
• Merge Sort
• Quick Sort
• Counting, Radix Sort
• Custom Sort using Comparator

🔍 Searching Algorithms

• Linear Search
• Binary Search (Basic & Advanced)
• Binary Search on Answer
• Search in Rotated Array

🧾 Hashing

• HashMap, HashSet
• Frequency Count, Two Sum
• Longest Consecutive Sequence
• Subarray with Given Sum K

🧱 Stack & Queue

• Stack using Array/LinkedLists
• Queue & Circular Queue
• Monotonic Stack
• Next Greater Element
• Min Stack
• Sliding Window Maximum

🔗 Linked List

• Singly, Doubly Linked List
• Reverse Linked List
• Loop Detection (Floyd’s)
• Merge Sorted Lists
• LRU Cache Design

🌳 Trees & BST

• Tree Traversals
• Height, Diameter, Balanced Tree
• Lowest Common Ancestor (LCA)
• Serialize & Deserialize Tree
• Kth Smallest Element in BST

📈 Heaps / Priority Queue

• Min Heap, Max Heap
• Kth Largest Element
• Top K Frequent Elements
• Merge K Sorted Lists

🌐 Tries

• Trie Implementation
• Prefix Matching
• Word Search
• Auto-complete System

📉 Greedy Algorithms

• Activity Selection
• Job Scheduling
• Fractional Knapsack
• Huffman Coding

🔁 Dynamic Programming

• Fibonacci (Memo/Tabulation)
• 0/1 Knapsack
• Subset Sum
• LCS / LIS
• DP on Grid & Strings

🔄 Graphs

• Graph Representation
• BFS, DFS
• Cycle Detection (Directed/Undirected)
• Topological Sort
• Union Find (DSU)
• Dijkstra, Kruskal, Prim

💡 Bit Manipulation

• Set/Clear/Toggle Bits
• Count Set Bits
• Power of 2
• XOR Patterns
• Bitmasking

📐 Matrix

• Spiral Traversal
• Rotate Matrix
• Search in 2D Matrix
• Number of Islands (DFS/BFS)
• Word Search

🧠 Advanced (Optional)

• Segment Tree, Fenwick Tree
• Suffix Array, Z Algorithm
• Mo’s Algorithm
• Bitmask DP

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🛠 Tools & Technologies

• Java 17
• IntelliJ IDEA / VS Code
• Git & GitHub
• LeetCode, GeeksForGeeks, HackerRank

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🎯 Learning Goals

• Build a rock-solid DSA foundation in Java
• Improve real-time problem-solving
• Get interview-ready for top tech companies

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🙌 Connect With Me

• 🔗 LinkedIn
• 📧 Email: azizmunna661@gmail.com
• 💬 WhatsApp: Click to Message

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⭐ Star this repo if you're also learning Java or preparing for interviews. Let's grow and learn together!