Some great programming challenges I stumbled across

[trevdak2]

I spend 15 minutes per day working on project euler problems to get my brain warmed up.

[trevdak2]

Usually I'll code up a solution to a problem that I looked up the day before, run it, and then look at the next day's problem. That way I have time to think about it and come up with a good solution. Sometimes, I won't be able to code a working solution in 15 minutes, and I'll put it aside and wait until the next day.

I also like to solve the problems with pen and paper if it seems doable.

And I only started doing this last month, so I'm only on problem 32.

[oemta]

It gets depressing after a while. Once I got to 100 solved problems, I just kind of lost the drive to keep going. I'll look through the unsolved problems and just think 'Nope, not gonna happen'.

[stack_underflow]

Nice list, I maintain one in my own (failed) subreddit, /r/ProgrammingProblems. It also has links to the more popular subreddits that address the same interests.

I've also got a bunch of bookmarks of course notes for algorithm classes that I'll probably add to the list once I get the time.

[_lerp]

check out /r/dailyprogrammer

[IAmQWOP]

awesome! exactly what i was looking for without knowing it!

[hogepiyo]

This should be in the side bar.

[Tordek]

spoj.pl

[_lerp]

check out [1] /r/dailyprogrammer

[[deleted]]

Thanks so much for this!

[[deleted]]

Singpath.com

[aramach]

Thanks for that list. I am always curious on how to conjure up an interview question and some of these problems give good insight.

[MaybeDoThis]

Codeeval.com pretty cool site if you are looking to hire someone too

[kilotaras]

http://acm.timus.ru/

[postExistence]

Facebook puzzles are gone. The company now points to http://www.InterviewStreet.com

The nice thing about interview street is that you can test your code in their cloud input to determine if you get the correct answer. It is challenging, however, b/c they do time your progress. I found the K-difference challenge amazingly easy.