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Programming Practice and Challenges

I've been missing the computer challenges on brilliant, so I went looking for some other resources. I would highly recommend Codecademy, especially for those who only know a little programming or want to learn some new languages. If you're looking specifically for Python challenges, I've been enjoying Python Challenge.

Do any of you have recommendations of other sites to sharpen or expand programming skills?

Note by Eric Edwards
4 years ago

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Project Euler has been mentioned here a few times in the past; another website that I think contains some nontrivial challenges is CodeEval. I myself am also very curious about your question, so I hope others will contribute more links. John Smith Staff · 4 years ago

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@John Smith Project Euler is very Powerful! Definitely start there, if you want to practice some number theory while you are at it I have seen the first 25 problems (out of like 600) solved by hand. Plus after you find a solution you can look at others more concise solutions. Luke Nelson · 4 years ago

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@John Smith I tried CodeEval, but it says that my submission fails. When I try the test cases though, it works perfectly. It doesn't give me any feedback on what went wrong, though, which is a shame. Tim Vermeulen · 4 years ago

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@Tim Vermeulen There is good feedback actually, once you find it. It always says "submitted successfully" unless your file has a file extension it doesn't know about. Click the link named "score". There you see whether it failed or not. If it failed, click on the revision number in the first column, and you see what the output from the program was, including error messages from the compiling/parsing/run time system. Arndt Jonasson · 4 years ago

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@Arndt Jonasson Nevermind. I forgot to uncomment the whole thing -.- That was pretty dumb. Thanks for your help. Tim Vermeulen · 4 years ago

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@Arndt Jonasson That's in fact exactly what I did, but after I click the revision number, I don't see the output and error messages, but I just see two tabs: Raw (my code) and Stdio (empty). Any idea what I'm doing wrong? Also, do you know whether using print() is the right way to output when using Python? Tim Vermeulen · 4 years ago

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Weekly algorithm contests in C++/Java/C#/Python, and ability to practice on previous challenges with lots of very good tutorials:


Online judges with lots of problems:



And, of course, USACO that holds monthly contests starting November to select the 4 high school students that represent USA in the International Olympiad of Informatics, the next Summer. It also has a system with tutorials and programming challenges that you have to overcome one level at a time to learn and face more difficult challenges.

And I was almost forgetting:

There are two multi-round yearly algorithm contests that are for everyone to participate hosted by Google and Facebook:

Google Code Jam

Facebook Hacker Cup

Google Code Jam usually starts around April and Facebook Hacker Cup in January. Additionally, you can see all previous problems for GCJ and test your solutions. Pedro Osório · 4 years ago

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I will recommend following:

Highly recommended




Project Euler






Codefu Mayank Kaushik · 4 years ago

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USACO -> the USAMO of c.s. Cody Johnson · 4 years ago

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I have some recommended for you:

URI Online Judge.

List, on the Wikipedia :) Andrias Yuwantoko · 4 years ago

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jan;s LightOJ is also very good Jawwad Siddique · 4 years ago

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Programming Praxis is a good one. Thaddeus Abiy · 4 years ago

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Love that site! A great place for people who really love math, and Computer Science! David Kroell · 4 years ago

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