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Learning to code?
Preparing for an interview?

Or just want to have fun with challenging problems?

Challenges

Hone your skills and prepare for interviews with practical and challenging problems.
Learn how to optimize and write efficient code and algorithms.

Ranking

Complete challenges and rank up.
Decorate your profile with badges and trophies.
Land a job at your dream company.

Contests

Compete with programmers of a large and growing community in contests.

Community

Learn and discuss solutions and best practices with fellow programmers.

Code in your favorite language

We currently support 13 popular languages, and are still adding more.