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Codility

Appears in 5 awesome lists

Free lessons with practice tasks on time complexity, prefix sums, sorting and more.

Open app.codility.com

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FYI

Section: Online Platforms · Develop your coding skills with lessons to take part in challenges

ActiveScore 75

Awesome Algorithms Education

Section: Competitive programming · Free lessons with practice tasks on time complexity, prefix sums, sorting and more.

FreshScore 85

FYI

Section: Online Platforms · Develop your coding skills with lessons to take part in challenges

ActiveScore 75

FYI

Section: Online Platforms · Develop your coding skills with lessons to take part in challenges

ActiveScore 75

Programming, Math, Science

Section: Programming

FreshScore 86

CodinGame

Learn Go by solving interactive tasks using small games as practical examples.

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Practice section for basic programming, data structures, algorithms and math, alongside hiring assessments.

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Interesting ranking system with beautiful UI for competitive programming and interview prep.

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English, Russian / Rated rounds about once a week plus Educational rounds, a large problem archive and community blogs.

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ERD Lab

Free cloud based entity relationship diagram (ERD) tool made for developers.

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OneCompiler

A versatile, AI-powered Online IDE supporting over 70+ programming languages, designed for developers to write, compile, and execute code seamlessly.

In 6 listsDetails

Project Euler

Mathematical problems that need both insight and programming to solve.

In 7 listsDetails

CodeChef

Practice problems and regular rated contests.

In 7 listsDetails