🚀 Free DSA Learning Platform

Master Data Structures
& Algorithms

From beginner to interview-ready. Learn DSA with PHP implementations, step-by-step dry runs, and FAANG-level practice problems.

Start Learning Jump to Arrays
📚 18 Topics
💻 PHP 8+ Code
🎯 40+ Problems
📝 Quizzes 
function binarySearch($arr, $target) {
    $low = 0; $high = count($arr) - 1;
    while ($low <= $high) {
        $mid = intdiv($low + $high, 2);
        if ($arr[$mid] === $target)
            return $mid;
        if ($arr[$mid] < $target)
            $low = $mid + 1;
        else $high = $mid - 1;
    }
    return -1;
}

🎯 Why Learn Data Structures & Algorithms?

Get Hired at Top Tech

FAANG and top tech companies evaluate DSA skills in technical interviews. Strong DSA = better offers.

Write Efficient Code

Choose the right data structures to optimize memory and speed. Write code that scales to millions of users.

Problem Solving Mindset

Develop analytical thinking. Break complex problems into manageable pieces with systematic approaches.

Career Growth

Senior engineers excel at DSA. It's the foundation for system design, architecture, and technical leadership.

🗺️ DSA Learning Roadmap

Follow this structured path from fundamentals to advanced algorithms. Each topic builds on the previous one.

01 🟢 Beginner
Introduction to DSA
30 min
02 🟢 Beginner
Time & Space Complexity
45 min
03 🟢 Beginner
Arrays
60 min
04 🟢 Beginner
Strings
45 min
05 🟡 Intermediate
Recursion
60 min
06 🟡 Intermediate
Linked List
75 min
07 🟢 Beginner
Stack
45 min
08 🟢 Beginner
Queue
45 min
09 🟡 Intermediate
Hashing
60 min
10 🟡 Intermediate
Trees
90 min
11 🟡 Intermediate
Binary Search Tree
75 min
12 🟡 Intermediate
Heap
60 min
13 🔴 Advanced
Trie
60 min
14 🔴 Advanced
Graph
90 min
15 🟡 Intermediate
Greedy Algorithms
75 min
16 🔴 Advanced
Dynamic Programming
120 min
17 🔴 Advanced
Backtracking
75 min
18 🔴 Advanced
Advanced Algorithms
90 min

💼 Interview Preparation Guide

Month 1-2: Foundation
Arrays, Strings, Recursion, Complexity Analysis
Month 3-4: Core DS
Linked List, Stack, Queue, Trees, Hashing
Month 5-6: Advanced
Graph, DP, Greedy, Backtracking
Month 7+: Practice
Mock interviews, contests, system design
Daily Practice Plan
📖 Theory 30 min
💻 Coding 60 min
📝 Quiz 15 min
🔄 Revision 15 min

🌟 Featured Sections

Dynamic Programming

Master 15 classic DP problems with recursive, memoization, tabulation & optimized solutions.

15 Problems
Graph Algorithms

BFS, DFS, Dijkstra, MST, Topological Sort & more with visual explanations.

10 Algorithms
Classical Problems

N-Queens, Tower of Hanoi, Sudoku Solver & other timeless DSA challenges.

15 Problems

🔥 Must-Solve Problems

Two Sum
Easy

Find two numbers that add up to a target. Classic hash map problem.

Solve →
Trapping Rain Water
Medium

Calculate trapped water between bars. Two-pointer technique masterpiece.

Solve →
N Queens
Hard

Place N queens on a chessboard. Classic backtracking problem.

Solve →

Ready to Master DSA?

Start with the fundamentals and build your way up to FAANG-level expertise.

Begin with Introduction Test Your Knowledge