Data Structures & Algorithms
Problem solving and algorithmic thinking.
- Structured Path
- Beginner to Advanced
Open Source Learning Platform
Build Skills
for What’s Next
A structured platform for computer science learning. Explore, practice, build, and move forward with confidence.
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- Current module68%
- Practice set45%
- Weekly goal82%
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Explore Learning Paths
Well-structured paths to help you build skills and achieve your goals.
Database Management Systems
How data is stored, queried and kept correct.
- Structured Path
- Beginner to Advanced
Operating Systems
What the machine is doing while your code runs.
- Structured Path
- Beginner to Advanced
Computer Networks
How systems talk to each other, layer by layer.
- Structured Path
- Beginner to Advanced
How it works
Read it, write it, keep it.
- 01
Read the idea
Short pages that explain the thing itself, in the order a course teaches it, with a diagram where a diagram helps.
Open a course - 02
Write the code
Type it, run it on a real compiler, and when a case fails you are told which one and why — not just that it broke.
Solve something - 03
Keep the proof
Every solve is recorded. What you have done becomes the thing you point at when somebody asks what you can do.
See the board
The workbench
A real compiler,
not a checkbox.
Five languages, hidden cases, and output you can read. The same toolchain grades your submission and runs whatever you paste into the playground.
main.cppgcc 10.2
#include <bits/stdc++.h>
int main() {
int n, m; std::cin >> n >> m;
// mark on enqueue, never on dequeue
std::vector<char> seen(n + 1);
}$ g++ -O2 main.cpp && ./a.out
Accepted · 9/9 tests · 41 ms · 3.2 MB
Ways in
More than one way in.
Open source
Read other people’s code, then change some of it. A first pull request is a smaller step than it looks.
View on GitHub(opens in a new tab)Your résumé
A record of what you have built and solved, in a form somebody hiring can read in thirty seconds.
Build a résumé(opens in a new tab)Your college
See who else on your campus is working through the same material, and where you sit among them.
Find your collegeThe playground
Anything you want to try, in any of the languages, with nothing graded and nothing recorded.
Start typingStart with one problem.
The first one prints a line of text. The last one is a graph.