Re: The Project Euler thread
 

Not every problem can be done with pencil and paper.

Re: The Project Euler thread
 

Rubix sent me to solve this

A bit of paperwork and then lots of wolframalpha

Re: The Project Euler thread
 

Nicely done

Re: The Project Euler thread
 

sorry I should've been more clear

I was referring to problem nine specifically, involving pythagorean triples

Re: The Project Euler thread
 

brute forcing 12 and it's not going so well. I'm almost an hour in and still no solution.
In hindsight, I probably would have used a much more efficient factor breakdown algorithm had I known it would take this long.

Re: The Project Euler thread
 

using brute force = not very interesting

usually more fun to try for the faster approaches

Re: The Project Euler thread
 

I'm sure there's a very elegant mathematical solution for all of these, but I'm just trying to get as far as I can :P

Re: The Project Euler thread
 

I did the first 30 (excluding 12) and even a couple of the 300+ ones before I figured out 12. I don't know why but that one was hard for me

Re: The Project Euler thread
 

Probably since there are so many different things you need to account for in 12. Not only do you need a gigantic 500+ factor number, but it also needs to be a summation of n number which is tricky to check for.

Re: The Project Euler thread
 

My brute force of 12 took 15 seconds to run.

Re: The Project Euler thread
 

does project euler ever teach you algorithms, e.x. dynamic programming, breadth/depth first search

Re: The Project Euler thread
 

Project Euler doesn't directly 'teach' you anything.

Re: The Project Euler thread
 

rephrasing question then

does project euler ever REQUIRE you to know algorithms, e.x. dynamic programming, breadth/depth first search

Re: The Project Euler thread
 

It's basically algorithm development, and if dynamic programming, breadth/depth first search is required for efficiency sake, then yes.

Also, rewrote my factorization algorithm and I solved 12 in 5 seconds :P

Re: The Project Euler thread
 

absolutely

even more so once you start venturing into the harder stages (where the problems also become much more interesting)

DP, especially, is used quite often

Re: The Project Euler thread
 

For example, try your hand at any of these:



http://projecteuler.net/problem=161
http://projecteuler.net/problem=425
http://projecteuler.net/problem=442

Re: The Project Euler thread
 

And of course, (some) of the big kahunas that will require both mathematical and programmatical sorcery:

http://projecteuler.net/problem=289
http://projecteuler.net/problem=328
http://projecteuler.net/problem=344
http://projecteuler.net/problem=361
http://projecteuler.net/problem=415

Re: The Project Euler thread
 

you almost have to be too smart...

Re: The Project Euler thread
 

ohhhh the eulerian circle one looks cool

really tempted to try that one lol

Re: The Project Euler thread
 

ohoho this will be fun, i should get back to project euler