SlaveCode.
Your code is your master.
Serve it well.
Master your skills with a comprehensive platform designed for growth. Access over 11,000+ coding problems, explore our Academy supporting 80 languages for beginners, and follow structured DSA roadmaps. Prepare for interviews with 470 company-specific questions, dive into System Design with detailed concepts and a fully-featured workspace, and more.
1class Solution {
2 public int[] twoSum(int[] nums, int target) {
3 HashMap<Integer, Integer> map = new HashMap<>();
4
5 for (int i = 0; i < nums.length; i++) {
6 int complement = target - nums[i];
7 if (map.containsKey(complement)) {
8 return new int[] { map.get(complement), i };
9 }
10 map.put(nums[i], i);
11 }
12 return new int[] {};
13 }
14}Master 3000+ Real Interview Problems
Everything you need to master your coding skills. From basic arrays to complex dynamic programming, practice in a fully-featured, distraction-free environment.
Explore All ProblemsAcademy
Perfect for beginners. Take your skills from basic to master across dozens
of languages, complete with structured roadmaps, detailed concepts, and hands-on practice problems.
82 languages for you to master
Master your preferred programming languages through curated, structured learning tracks designed for deliberate practice.
Gleam
Go
Groovy
Basics
0 / 1 exercise
Booleans
0 / 1 exercise
Strings
0 / 1 exercise
If-Else Statements
0 / 1 exercise
Numbers
0 / 1 exercise
Every language has a properly structured track roadmap having all detailed concepts and exercises.
View Full Roadmap
Hello World
SlaveCode's classic introductory exercise. Just say "Hello, World!".
Cook Your Lasagna
Learn about the basics of Java by following a lasagna recipe.
Annalyn's Infiltration
Learn about booleans while helping Annalyn rescue her friend.
Bird Watcher
Learn about arrays by keeping track of how many birds visit your garden.
Karl's Languages
Learn about lists by helping Karl keep track of the languages he wants to learn on SlaveCode.
Calculator Conundrum
Learn about exception-handling by making a simple calculator.
Each language has lots of basic to advanced questions to solve, so you can practice while learning.
Explore Practice ExercisesRoadmap
Master Data Structures and Algorithms in the perfect sequence.
Track your progress as you unlock concepts from basic Arrays to advanced Graph theory.
Master Data Structures
and Algorithms
Stop guessing what to learn next. Our interactive taxonomy roadmaps guide you through every concept of DSA in a highly structured, logical order.
Navigate through clearly defined subtopics from basic Arrays to complex Trees and Tries. Each topic is paired with targeted practice problems, allowing you to solve questions and track your true mastery as you conquer every node on the path.
Arrays
Stacks
Strings
LINKED LISTS
QUEUE / DEQUE
Hash map
TREES
Recursion
TRIE
470 companies for you to master
Master your preferred company questions through curated, structured learning tracks designed for deliberate practice.
Explore 470+ top tech companies. Each profile features real
interview questions that you can solve directly in our built-in editor while tracking your success stats over time.
System Design
Master system architecture with comprehensive learning modules.
Dive deep into structured case studies and build real-world applications using our interactive workspace.
56 topics for you to master
Master system design through structured, in-depth learning tracks. Dive into 56 essential topics and concepts designed for deliberate practice.
What is system design?
Before we start this course, let's talk about what even is system design.
System design is the process of defining the architecture, interfaces, and data for a system that satisfies specific requirements. System design meets the needs of your business or organization through coherent and efficient systems. It requires a systematic approach to building and engineering systems.
Why is it important?
System design helps us define a solution that meets the business requirements. It is one of the earliest decisions we can make when building a system. Often it is essential to think from a high level as these decisions are very difficult to correct later.
API gateway
Lambda
Server
Data
QueueWorker1Worker2Worker1
S3
AnalyticsMaster Architecture with Professional Tools
The interactive workspace gives you ultimate control to draw and learn. Access 3,900+ architecture icons, generate architectures via Code-to-Diagram, utilize AI design assistance, and explore a massive pre-built diagram catalog.
Explore WorkspaceArena
Challenge your friends and developers worldwide.
Engage in real-time coding matches, climb the leaderboards, and sharpen your competitive programming skills.
Arena Lobby
Maximum Sum Path Challenge
Participants :
4 / 50Host or Join a match
Select problems from our extensive catalog to host a custom coding match, or simply enter a pin code to join an active match. Compete in real-time against other challengers, global rankings and Arena Points are awarded based on your final rank and execution speed.
1class Solution {
2 public int[] twoSum(int[] nums, int target) {
3 HashMap<Integer, Integer> map = new HashMap<>();
4
5 for (int i = 0; i < nums.length; i++) {
6 int complement = target - nums[i];
7 if (map.containsKey(complement)) {
8 return new int[] { map.get(complement), i };
9 }
10 map.put(nums[i], i);
11 }
12 return new int[] {};
13 }
14}Fully-Featured Competitive Editor
Everything you need to dominate the match. Utilize the built-in scratchpad, keep pace with the live match timer, leverage instant test execution, and keep an eye on your competition with real-time tracking.
Enter the ArenaGlobal Contests
Never miss a coding competition again.
We aggregate contests from all major platforms into one unified calendar.
Track every coding contest
We aggregate all coding contests from across the globe into a single, unified dashboard. Whether it's LeetCode, Codeforces, AtCoder, or CodeChef—view schedules at a glance and register with a single click.
Compiler Playground
A high-performance sandbox where you can code and test logic in multiple languages.
Execute your scripts instantly in a distraction-free environment.
1fn main() {
2 let a = 25;
3 let b = 17;
4
5 println!("Calculating sum...");
6 println!("Sum of {} + {} is: {}", a, b, a + b);
7}Powerful Execution Engine
Write, compile, and execute code in multiple languages instantly. Benefit from sub-second compilation, standard input support, and live console feedback in a distraction-free environment.
Open CompilerReady to Level Up?
Start Your Journey.
Master your skills with a comprehensive platform. Access over 11,000+ coding problems, explore our Academy supporting 80 languages for beginners, and follow structured DSA roadmaps. Prepare for interviews with 470 company-specific questions, dive into System Design, and more.