Top 24 alternative sites to codechef.com
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codeforces.com
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hackerearth.com
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hackerrank.com
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onlinegdb.com
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leetcode.com
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topcoder.com
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ideone.com
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programiz.com
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stopstalk.com
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spoj.com
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geeksforgeeks.org
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tutorialspoint.com
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atcoder.jp
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cp-algorithms.com
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cplusplus.com
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stackoverflow.com
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github.com
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projecteuler.net
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interviewbit.com
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techiedelight.com
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jdoodle.com
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ioinformatics.org
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developphp.com
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webbasedprogramming.com
Codeforces
Codeforces. Programming competitions and contests, programming community
HackerEarth | Helping 5M+ developers level up and 1000+ recruiters hire top tech talent.
HackerEarth is a global hub of 5M+ developers. We help companies accurately assess, interview, and hire top tech talent.
HackerRank
HackerRank is the market-leading technical assessment and remote interview solution for hiring developers. Learn how to hire technical talent from anywhere!
online compiler and debugger for c/c++
Online GDB is online compiler and debugger for C/C++. You can compile, run and debug code with gdb online. Using gcc/g++ as compiler and gdb as debugger. Currently C and C++ languages are supported.
LeetCode - The World's Leading Online Programming Learning Platform
Level up your coding skills and quickly land a job. This is the best place to expand your knowledge and get prepared for your next interview.
Topcoder Top Technology Talent On-Demand
Topcoder is home to the world’s largest community of designers, developers, and data scientists. Allowing you the freedom to start and execute faster.
Author: Ravi Chandran Head; BT
Ideone.com
Ideone is something more than a pastebin; it's an online compiler and debugging tool which allows to compile and run code online in more than 40 programming languages.
Learn to Code for Free
Learn to code in Python, C/C++, Java, and other popular programming languages with our easy to follow tutorials, examples, online compiler and references.
StopStalk
A tool to analyse and improve your Competitive Programming Progress
Author: StopStalk admin com
Become a true programming master
SPOJ (Sphere Online Judge) is an online judge system with over 315,000 registered users and over 20000 problems. The solution to problems can be submitted in over 60 languages including C, C++, Java, Python, C#, Go, Haskell, Ocaml, and F#. SPOJ has a rapidly growing problem set/tasks available for practice 24 hours/day, including many original tasks prepared by the community of expert problem setters associated with the project.
GeeksforGeeks | A computer science portal for geeks
A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions.
The Biggest Online Tutorials Library
The Biggest Online Tutorials Library - AppML, AI with Python, Behave, Java16, Spacy
Author: Tutorialspoint
AtCoder
AtCoder is a programming contest site for anyone from beginners to experts. We hold weekly programming contests online.
Author: AtCoder Inc
Main Page - Competitive Programming Algorithms
The C++ Resources Network
Stack Overflow - Where Developers Learn, Share, & Build Careers
Stack Overflow | The World’s Largest Online Community for Developers
GitHub: Where the world builds software
GitHub is where over 65 million developers shape the future of software, together. Contribute to the open source community, manage your Git repositories, review code like a pro, track bugs and feat...
About - Project Euler
A website dedicated to the fascinating world of mathematics and programming
Author: Colin Hughes
InterviewBit: Coding Interview Questions
Learn and Practice on almost all coding interview questions asked historically and get referred to the best tech companies
Author: Kings Gambit Labs
Other sites like codechef com
Techie Delight
Techie Delight provides huge collection of data structure articles on various topics which are useful for technical interview preparation to crack interviews of top IT companies.
Author: Array August 1
Online Compiler and Editor/IDE for Java, C/C++, PHP, Python, Perl, etc
JDoodle is a free Online Compiler, Editor, IDE for Java, C, C++, PHP, Perl, Python, Ruby and many more. you can run your programs on the fly online and you can save and share them with others. Quick and Easy way to compile and run programs online.
Need more info?
The IOI is the most prestigious computer science competition in the world for secondary school students. UNESCO and IFIP are patrons. The contest consists of two days of computer programming and solving various tasks of algorithmic nature. Students at the IOI compete on an individual basis, with up to four students competing from each participating country.
Learn web development and design online free
Learn web development, software engineering, application scripting, graphic design and much more at the DevelopPHP Development Technology Training Center. The focus is on HTML, CSS, PHP, SQL, JavaScript, Ajax, JSON, Animation, Database Programming, plus a whole lot more for the modern developer community.
Author: Adam Khoury
Web Based Programming Tutorials - CGI, Java, MySQL, Perl, HTML, Oracle, VBScript, Visual Basic, Java Applets and lots more!
WebBasedPRogramming.com is your free online resource for learning to program using the .NET Framework, ASP.NET, C#, C, C++, Java, J2EE, SQL, Perl, Web Services, Visual Basic .NET, XML, VB.NET, and many other languages over the internet.
