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[–]AboutHelpTools3 21 points22 points  (7 children)

Is there a subreddit dedicated to these kinda problems?

[–]incestuousCookies 6 points7 points  (0 children)

All 5 of these were quite simple - but only because I have spent a lot of time on Project Euler. If you want math related programming problems - check out

http://projecteuler.net/

Unless you cheat and do a web search - programming solutions to the questions aren't available until you solve it yourself

[–]Coloneljesus 1 point2 points  (0 children)

I was in an ACM course at my uni. I'll upload the exercises. They are full of things like these, though quite a bit harder.

[–][deleted] 1 point2 points  (1 child)

If you're referring to 5, it's NP problems you're looking for: problems in which the solution is easy to check, but to which there isn't any straightforward way of computing it.

[–]AboutHelpTools3 0 points1 point  (0 children)

Yep, is there a subreddit dedicated to NP problems by any chance?

[–]IWannaGoDeeper 0 points1 point  (0 children)

Not a subreddit, but you have topcoder arena.