Data Structures and Algorithms (DSA) & Java Foundations

This repository contains resources and implementations for core DSA concepts and fundamental Java programming topics.

Completed Topics

Basics of Programming

• Flowcharts & Pseudocodes
• Variables & Data Types
• Conditional Statements
• Operators

Loops & Functions

• For loop, While loop, Do-while loop
• Patterns
• Functions

Arrays

• Introduction to Arrays
• Searching & Sorting
  • Linear search
  • Binary search
  • Selection sort
  • Bubble sort
  • Insertion sort
  • Count sort

2D Arrays & Strings

• 2D Arrays
• Strings

Linear Data Structures

• ArrayLists
• Linked lists
  • Insertion and deletion operations
  • Midpoint of linked list
  • Merging sorted linked lists
  • Reversing a linked list
• Stacks and Queues
  • Stack using arrays and linked list
  • Queue using arrays
  • Dynamic queue class
  • Circular queue

Advanced Data Structures

• Binary Trees & BST
  • Introduction to Binary Trees
  • Tree traversals
  • Height and LCA of tree
  • Binary Search Trees
  • Insertion and deletion in BST
  • Types of balanced BSTs
• Heaps/Priority Queues
  • Min/Max heaps
  • Heap Sort
  • Priority Queues implementation
  • Insert and Delete operations
• Hashing (Maps & Sets)
  • Hashmaps
  • Hashsets
  • Implementation details
• Tries
  • Basic operations and implementation
• Graphs
  • Introduction and terminology
  • Graph traversals (DFS and BFS)
  • Weighted and directed graphs
  • Minimum Spanning Trees
  • Cycle Detection
  • Dijkstra's algorithm
  • Bellman Ford Algorithm
• Segment Trees
  • Creation and range queries

Problem Solving Techniques

• Recursion, Backtracking, Divide & Conquer
  • Principle of mathematical induction
  • Factorial, Fibonacci using recursion
  • Recursion with arrays and strings
  • 2D array recursion
  • Merge sort and quick sort
• Bit Manipulation
  • Binary number system
  • Bitwise operators
  • Bit operations
  • Fast exponentiation
• Time & Space Complexity
  • Order complexity analysis
  • Theoretical complexity analysis
  • Analysis of searching and recursive algorithms
• Greedy Algorithms
  • Introduction to greedy approach
  • Classical problem solving

Dynamic Programming

• Fundamentals of DP
• Memoization
• Knapsack, Factorial, Fibonacci using DP
• Longest Common Subsequence
• Edit distance
• Matrix Chain Multiplication

Object-oriented programming

• Objects & Classes
• Constructors and related concepts
• Abstraction, Encapsulation
• Inheritance, Polymorphism
• Abstract classes
• Interfaces

Remaining Topics

Advanced Data Structures

• Trees (Advanced)

  • AVL Trees
  • Red-Black Trees
  • B-Trees

• Advanced Graph Algorithms

  • Network Flow
  • Bipartite Matching
  • Advanced Path Algorithms

• Advanced Data Structures

  • Disjoint Set Union (Union-Find)
  • Fenwick Trees (Binary Indexed Trees)

Algorithms

• Advanced Sorting

  • RadixSort
  • CountingSort optimization

• String Algorithms

  • KMP Algorithm
  • Rabin-Karp
  • Suffix Arrays and Trees
  • String Matching

Advanced Java Concepts

• Object-Oriented Programming in Depth

  • Design patterns implementation

• Exception Handling

  • Custom exceptions
  • Exception chaining
  • Try-with-resources
  • Best practices

• Java Collections Framework

  • Advanced collections usage
  • Performance characteristics
  • Custom implementations
  • Collections utility methods
  • Concurrent collections

• Generics

  • Type erasure
  • Bounded type parameters
  • Wildcards
  • Generic methods and classes

• Multithreading and Concurrency

  • Thread lifecycle and states
  • Synchronization mechanisms
  • Locks and atomic variables
  • Thread pools and executors
  • CompletableFuture
  • Fork/Join framework

Advanced Java

• Java I/O and NIO

  • File handling
  • Serialization
  • Non-blocking I/O
  • Memory-mapped files

• Functional Programming

  • Lambda expressions
  • Method references
  • Functional interfaces
  • Stream API advanced operations

• Reflection and Annotations

  • Dynamic class loading
  • Metaprogramming
  • Custom annotations
  • Annotation processors

• Java Database Connectivity (JDBC)

  • Connection pooling
  • Prepared statements
  • Batch processing
  • Transaction management

• Java APIs

  • Date and Time API
  • Optional class
  • Regular Expressions
  • Internationalization

Implementation Projects

• Graph algorithms visualizer
• Dynamic programming problem solver
• Custom data structure library
• Multithreaded application examples
• Design patterns showcase

Learning Resources

• Books
• Online courses
• Practice websites
• Community forums

Contributing

Feel free to contribute to this repository by adding implementations, improving existing code, or suggesting additional topics.