Programming challenges and contests across the entire computer science domain
Code inside the browser in your chosen language, optimize your algorithms, and learn as you go.
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Multiple Editor Modes
Our in-browser code editor supports two modes of editor (in addition to normal): Emacs and VIM. Choose the one the works best for you. Don't worry, we won't judge.
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Custom Stubs
We pre-fill the code editor with stubs for each language, so you can focus your time on coding the perfect solution. Use our defaults or code your own. "Customizable" is the key here.
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Upload Your Code
Don't want to write your solution in the browser? No problem! You can easily code in your own environment and upload your solution for us to compile.
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Choose your Language
We currently support 22 programming languages and growing. Select your favorite or go for variety. We track your submissions by language so you can easily revise your solutions.
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Full-screen Mode
So you're rocking that brand new, 27" monitor and you want a code-environment to match? We've got that covered. Switch easily into full-screen and back again to match your needs.
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Compile and Test
Easily compile your code and test it against our testcases or testbot so you don't have to submit your code blindly. You can choose to use your own testcase, too. Troubleshooting in the browser....yup, that's pretty cool.
Choose your favorite type of challenges
Our expanding set of challenges spans the full array of computer science disciplines. Whether you choose to solve them in order or by track, you’ll find hours of fun and thrilling excitement.