README

DS-Algo Practice (Java)

Setup

• Java Version: Java 17+ (features requiring Java 21+ are marked with // Java 21+)
• Structure: Pattern-based organization for interview prep and real-world application

How to Interact with This Folder

For Claude Code:

1. Adding New Patterns: Create files in src/patterns/ with the pattern name
2. Adding Practice Problems: Create markdown files in practice-sessions/ linking to problems
3. Solution Template: Each solution includes:
   • Problem statement & link
   • Industry use case
   • Multiple approaches with tradeoffs
   • Time & space complexity analysis
   • Java implementation

Pattern Categories

• Array/String Manipulation: Two Pointers, Sliding Window, Prefix Sum
• Search & Sort: Binary Search, Quick Select, Merge Sort
• Graph/Tree: DFS, BFS, Union Find
• Dynamic Programming: Memoization, Tabulation
• Data Structures: Stack, Queue, Heap, HashMap

Utilities Available

• TreeNode: Binary tree node with helper methods (fromArray, print)
• ListNode: Linked list node with conversion methods (fromArray, toArray)
• GraphNode: Graph node for graph problems
• ArrayUtils: Array operations (print, reverse, min/max, sum, etc.)
• TestHelper: Testing framework with assertions and timing

Running Code

cd DS-Algo-Practice
 
# Compile all patterns and utilities (outputs to bin/)
javac -d bin -cp src src/patterns/*.java src/utils/*.java
 
# Run a pattern
java -cp bin patterns.TwoPointers
 
# Run utilities (to see examples)
java -cp bin utils.TestHelper
java -cp bin utils.ArrayUtils

Note: Compiled .class files go to bin/ directory (hidden in Obsidian)

Quick Start

1. Review pattern in src/patterns/
2. Check practice session in practice-sessions/
3. Implement solution
4. Compare with provided solutions