GitHub - rajit2004/java_progress: This repository tracks my journey of learning Java, Data Structures & Algorithms

I'm Ranesh Rajit, a B.Tech CS student from India, learning Java and DSA from scratch — the hard way, problem by problem.

Every concept I study and every problem I solve goes into this repo so that other students on the same journey can learn alongside me for free.

java_progress/
└── src/
    ├── Basics/              # Java fundamentals — data types, I/O, operators, type casting
    ├── Conditionals/        # If-else, switch, nested conditions
    ├── Loops/               # Loop patterns and practice
    ├── Methods/             # Functions, overloading, varargs, recursion
    ├── Arrays/              # Array & ArrayList operations, 2D arrays, passing in functions
    ├── Strings/             # String methods, builders, palindrome, comparisons
    ├── Numbers/             # Armstrong, Fibonacci, prime, number reversal
    ├── Searching/           # Linear search, Binary search (ascending/descending/2D/order-agnostic)
    ├── Sorting/             # Bubble, Selection, Insertion, Cycle, Merge sort + recursive variants
    ├── Recursion/           # Recursion fundamentals — sorting, searching, patterns, maths
    ├── Questions/           # Practice questions — Arrays, BitOps, Numbers, Patterns, Recursion
    ├── Notes/               # Reference notes
    └── LeetCode/
        ├── Arrays/          # 48 files — Two Sum, Missing Number, Greedy, Asteroids…
        ├── BinarySearch/    # 13 files — Rotated arrays, peak finding, mountain array…
        ├── Strings/         # 27 files — Anagram, palindrome, sliding window, password…
        ├── TwoPointers/     # 7 files — Valid Palindrome, Move Zeroes, Happy Number…
        ├── BitManipulation/ # 3 files — Reverse Bits, Number of 1 Bits, Steps to Zero
        ├── Math/            # 8 files — Power of Two, Ugly Number, Fizz Buzz…
        ├── Recursion/       # 1 file — Steps to Reduce Number to Zero
        └── Misc/            # 4 files — Isomorphic Strings, Richest Customer Wealth…

This repo is free for everyone — no paywalls, no paid courses. If it's helped you or you want to support the journey: