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A comment on Show HN: Codewars. Parent comment

Re:Show HN: Codewars by philippotto on Wednesday February 05, 2014 @08:39PM (#7188175)
You could make a first evaluation on the client so that the user gets quick feedback whether his solution is right. To validate that the user didn't cheat, you can make a second evaluation (server sided). The user shouldn't be forced to wait for the server sided evaluation. Instead he should be able to solve the next task immediately.

But nevertheless: Great idea with a lot of potential! Maybe you can give more detailed compile errors, if the user wrote incorrect code.

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Re:Show HN: Codewars by gizzlon on Thursday February 06, 2014 @04:03AM (#7189404)
If you do implement this, you can also avoid validating every submission server-side. It should be enough to check a random sample. If you suspect someone, you can start checking them more aggressively.

If you want to get serious, there's actually a lot of research into cheating prevention :)

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