I'm looking for websites with programming problems that I can practice [on hold]

Posted by Spentak on Programmers See other posts from Programmers or by Spentak
Published on 2013-10-22T00:00:18Z Indexed on 2013/10/22 4:06 UTC
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java

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c#

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c++

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objective-c

I want to become a more skilled programmer. I also want to do it through Objective-C and iOS.

What websites or programs that you know of have problems that I can solve (with the answers)? I have failed some programming tests for jobs (such as "Given 2 values in a Binary Tree - how do you find the lowest common ancestor?) and I want to become a better engineer.

I have developed 54 iOS/Android apps to date, but my core CS Skills apparently are rusty/bad.

I have looked at TopCoder - but there aren't very many competitions going on, the website is terrible, and there does not appear to be anything that really supports Objective-C/iOS

Websites?

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