DSA Mastery Workspace

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⚡ DAILY CHALLENGE

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"Stay focused, one problem at a time."

DSA Problem Solving Roadmap

Step-by-step interactive learning path from fundamentals to advanced algorithms

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Phase 1 • Problem-Solving Foundations 🎯 Practice: 30–40 Problems

Math, Logic & Basic Programming

Build the thinking skills required before learning advanced data structures.

🎯 Goal: Learn to convert a real-world question → steps → algorithm → code.
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Basic Math Problems Digit Sum • Count Digits • Reverse Number • Palindrome Number • Armstrong Number • Prime Number • GCD & LCM
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Loops & Patterns Nested Loops • Number Patterns • Star Patterns • Counting • Series • Basic Simulation
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Logical Problem Solving Maximum/Minimum • Even/Odd • Factors • Divisibility • Frequency • Simple Conditions
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Complexity Basics O(1) • O(log n) • O(n) • O(n²) • Time vs Space
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Phase 2 • Core Data Structures 🎯 Practice: 40–50 Problems

Arrays, Strings & Hashing

Learn how to store, access, search, and organize information efficiently.

🎯 Goal: Understand what data structure fits the problem.
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Arrays Traversal • Searching • Insertion • Deletion • Reverse • Rotation • Subarrays
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Strings Character Counting • Reverse • Palindrome • Anagram • Substrings
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Hashing Hash Map • Hash Set • Frequency Map • Duplicate Detection • Fast Lookup
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Essential Problems Contains Duplicate • Valid Anagram • Two Sum • Majority Element • Group Anagrams
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Phase 3 • Problem-Solving Patterns 🎯 Practice: 50–70 Problems

Two Pointers, Sliding Window, Prefix Sum & Binary Search

Start recognizing patterns instead of solving every problem from scratch.

🎯 Goal: Learn to recognize patterns that reduce unnecessary work.
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Two Pointers Opposite Direction • Same Direction • Pair Problems • Sorted Arrays • Palindrome
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Sliding Window Fixed Window • Variable Window • Longest Subarray • Longest Substring
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Prefix Sum Range Sum • Subarray Sum • Cumulative Information
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Binary Search Normal Search • First/Last Position • Rotated Array • Search Space • Binary Search on Answer
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Phase 4 • Linear & Recursive Structures 🎯 Practice: 50–70 Problems

Linked Lists, Stack, Queue & Recursion

Learn pointer manipulation and recursive thinking.

🎯 Goal: Learn to break a large problem into smaller manageable problems.
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Linked Lists Singly List • Doubly List • Reverse List • Middle Node • Fast & Slow Pointer • Cycle Detection
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Stack & Queue LIFO • FIFO • Valid Parentheses • Min Stack • Monotonic Stack • Next Greater Element
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Recursion Base Case • Recursive Call • Call Stack • Factorial • Fibonacci • Array Recursion
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Backtracking Intro Choose • Explore • Undo • Subsets
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Phase 5 • Non-Linear Data Structures 🎯 Practice: 60–80 Problems

Trees, Heaps & Graphs

Learn to work with hierarchical and connected data.

🎯 Goal: Learn how to traverse, explore, and process complex relationships.
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Trees & BST DFS • BFS • Preorder • Inorder • Postorder • Level Order • Height • Search
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Heaps & Priority Queue Min Heap • Max Heap • Kth Largest • Top K • Task Scheduling
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Graphs Adjacency List • BFS • DFS • Connected Components • Cycle Detection
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Graph Algorithms Shortest Path • Topological Sort • Union Find • MST Basics
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Phase 6 • Advanced Problem Solving 🎯 Practice: 80–100 Problems

Backtracking, Dynamic Programming & Interview Thinking

Solve problems where brute force is too expensive.

🎯 Goal: Stop asking “Have I seen this exact problem?” and start asking “What idea can solve this?”
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Backtracking Permutations • Combinations • Combination Sum • N-Queens • Maze Problems
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1D Dynamic Programming Climbing Stairs • House Robber • Coin Change • Decode Ways • LIS
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2D Dynamic Programming Grid Problems • Knapsack • LCS • Subsequence Problems
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DP Thinking Recursion → Identify State → Memoization → Tabulation → Space Optimization
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Interview Problem Solving Understand → Example → Brute Force → Find Bottleneck → Optimize → Code → Test → Complexity

🎓 Placement & CS Core Resource Hub

Complete placement preparation suite: Aptitude, CS Core (OS, DBMS, CN, System Design), Java Theory & Technical/HR Interview Questions.

25+ Verified Links
5 Core Categories
ATS Resume Scanners
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7 Verified Links

Placement, Resume & Communication

Resume building, ATS checkers, spoken communication apps, and peer mock interviews.

Soft Skills
10 Ways to Improve Communication Skills Essential soft skills & communication guide for campus interviews
↗ Play Store
PeerUp App (Spoken English & Communication) Practice live spoken English and interview communication with peers
↗ Template
Jake's Resume Template (GitHub / LaTeX) Most popular ATS-friendly Single Page LaTeX Software Engineer Resume
↗ ATS Checker
Resume Worded (ATS Checker) Scan your resume against ATS bots & get instant scoring
↗ Peer Mock
Pramp (Free Peer Mock Interviews) Practice live 1-on-1 coding & behavioral interviews with peers
↗ GFG Track
GeeksforGeeks Campus Placement Portal Complete end-to-end placement track for Tier 1, 2, and 3 colleges
↗ SDE Sheet
Striver's SDE Sheet & Company Questions Curated company-wise top asked interview questions
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4 Verified Links

Aptitude & Logical Reasoning

Quantitative math, logical reasoning, verbal ability & shortcuts.

GFG Aptitude
GeeksforGeeks Aptitude Questions & Answers Comprehensive solved aptitude questions for campus placement tests
↗ Quant
IndiaBIX Quantitative Aptitude Time & Work, Speed & Distance, Profit & Loss, Probability, Permutations
↗ Logic
IndiaBIX Logical Reasoning Blood Relations, Coding-Decoding, Syllogism, Seating Arrangements
↗ Practice
PrepInsta Aptitude Test Series Company specific aptitude test patterns (TCS, Infosys, Wipro, Accenture)
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10 Verified Links

CS Core Subjects (OS, DBMS, CN, System Design)

Essential theoretical fundamentals for technical interview rounds.

DBMS Qs
GFG Commonly Asked DBMS Interview Questions Top DBMS & SQL queries asked in campus placements & tech interviews
↗ OS Qs
GFG Operating Systems Interview Questions Essential OS concepts: Process, Threads, Deadlocks, Paging & Scheduling
↗ CN Qs
GFG Computer Networking Interview Questions Top Computer Networks & Protocol questions for SDE roles
↗ System Design
GeeksforGeeks System Design Tutorial Complete High Level (HLD) & Low Level (LLD) Design Guide
↗ OS Notes
Operating Systems (OS) Complete Notes Process vs Thread, CPU Scheduling, Deadlocks, Paging, Virtual Memory
↗ DBMS Notes
DBMS & SQL Mastery Notes ACID Properties, Normalization (1NF–BCNF), Transactions, Indexing & SQL Queries
↗ Interactive SQL
SQLZoo Interactive SQL Practice Interactive SQL query runner for JOINs, Group By, Subqueries & Aggregates
↗ CN Notes
Computer Networks (CN) Guide OSI vs TCP/IP Layers, HTTP/HTTPS, TCP vs UDP, DNS, IP Subnetting
↗ Primer
System Design Primer (GitHub) Load Balancers, Caching (Redis), Sharding, Microservices, CAP Theorem
↗ OOPs
Refactoring Guru (OOPs & Design Patterns) Visual guide to Singleton, Factory, Observer, Strategy & SOLID principles
↗ Video Lectures
Gate Smashers Video Series Top-rated CS Core video tutorials for OS, DBMS, CN & Theory of Computation
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7 Verified Links

Java Theory & Core Concepts

JVM internals, Garbage Collection, Collections framework, Threads & Java 8+.

Java Tutorial
GeeksforGeeks Complete Java Tutorial Full Java tutorial series from basics to advanced OOP & Collections
↗ Java Qs
GeeksforGeeks Core Java Interview Questions Top Core Java interview questions & answers for freshers and experienced
↗ HashMap
HashMap Internal Working in Java Hashing, Buckets, Collision handling, LinkedList to Red-Black Tree conversion
↗ Collections
Java Collections Framework Masterclass List, Set, Map, Queue, PriorityQueue, Comparable vs Comparator
↗ GC
Garbage Collection in Java Generational GC (Young, Old, Metaspace), G1 Collector, Mark & Sweep
↗ JVM Architecture
JVM Architecture & Memory Management Heap, Stack, Method Area, ClassLoader Subsystem, JIT Compiler
↗ Threads
Java Multithreading & Concurrency Thread Lifecycle, Synchronized blocks, Volatile, ExecutorService, Deadlocks
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5 Verified Links

Top Interview Questions & HR Prep

Most asked coding interview questions, behavioral STAR method & HR questions.

Tech Qs
GeeksforGeeks Technical Interview Questions Company-wise technical interview questions for Software Engineers
↗ HR Portal
GeeksforGeeks HR Interview Questions Comprehensive list of HR round questions, behavioral scenarios & tips
↗ NeetCode 150
NeetCode 150 Practice Roadmap Interactive 150 topic-wise problems with video solutions
↗ Blind 75
Blind 75 LeetCode Questions The 75 most essential LeetCode DSA questions for tech interviews
↗ Top 150
LeetCode Top Interview 150 Official LeetCode curated 150 interview problems list
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