10192011, 09:41 PM  #1 
FFR Player
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The Project Euler thread
for getting stargroup mad at people leaking answers EXCEPT NOT BECAUSE WE HAVE...
http://projecteuler.net/ what you do is simple: 1. make an account 2. open a problem 3. solve the shit out of it 4. rinse and repeat a lot of the problems, ESPECIALLY later on, require you to find a general solution via programming and plug some ridiculously large parameters into them anyway, i have completed: 113, 16, 18, 28, 33, 52, 67, 79, 108, 110, 157, 267, 355 and i am working on something...
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~*~Lurkadurk  113477966967~*~ Last edited by FFR4EVA_00; 10272011 at 08:46 PM.. 
10192011, 10:43 PM  #2 
Zageron E. Tazaterra
Infrastructure

Re: THE project euler thread
I've completed 3 of the puzzles so far, mostly because I have very little time to complete them. I will be going in linear order from start to finish! Using C++ as my language because I'm taking a course on it right now.
Excellent idea ffr4eva. When people run into problems they can post their questions here, just remember to hide your solutions in spoiler tags and try not to ever post the complete solution! 
10192011, 11:54 PM  #3  
Celestial Harbor

Re: THE project euler thread
Quote:
i have 125, 28 and 30 And i work with java 

10202011, 05:09 AM  #4 
Kawaii Desu Ne?
Join Date: Dec 2007
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Age: 26
Posts: 4,118

Re: THE project euler thread
So far I've done 1,2,3,5 and 6. I just learned about the bigInteger type in Java so now I'll be using that (since the 'long' type isn't ****ing long enough __.)

10202011, 09:30 AM  #5  
Celestial Harbor

Re: THE project euler thread
Quote:
I used manual math with arrays of integers 

10202011, 07:51 PM  #6 
Kawaii Desu Ne?
Join Date: Dec 2007
Location: The Kawaiian Island~
Age: 26
Posts: 4,118

Re: THE project euler thread
Sounds like how the bigInteger type would be implemented. I'd rather just use that, I find no point in implementing a new data structure if one is already implemented for me to use already. :razz:

10202011, 08:03 PM  #7 
Diana is my queen <3

Re: THE project euler thread
This seems really interesting. I could try to do this on my free time to work on my computer skills.
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10202011, 10:45 PM  #8 
the Mathemagician~

Re: THE project euler thread
I'm currently at 49, using mostly Maple. I have done a couple in C++ too, where speed mattered.
I should get back into it. Friend key is 62306152188978_1d29510ddc0c52e8c33db3cdbaf399db for interested people. 
10202011, 10:47 PM  #9 
I am leonid
Join Date: Oct 2008
Location: MOUNTAIN VIEW
Age: 30
Posts: 8,065

Re: THE project euler thread
* Working on P83 *
I'm mostly using Ruby and C My friend key: 1858629421787_a864c4e88f44e36b8023644c0f14493e Last edited by leonid; 10202011 at 10:50 PM.. 
10202011, 11:24 PM  #10 
Diana is my queen <3

Re: THE project euler thread
I just started today and got 1, 2, 3, 5, 6, 7, 9, 10, 16, 20, 25, 45, 48, and 52 solved. I'm using Mathematica here.
Friend Key: 76814575274714_b466b39d7ef7730e66d3da5b16df2525
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10212011, 01:20 AM  #11  
Kawaii Desu Ne?
Join Date: Dec 2007
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Age: 26
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Re: THE project euler thread
By the way... Friend Key: 41335338220707_9d1fa87f00c010a47b494214e8b3416e ^_^
EDIT: I managed to do a few today, and now I have 110 done. ^_^ Quote:
Last edited by reuben_tate; 10212011 at 07:31 AM.. 

10212011, 08:39 AM  #12 
x'); DROP TABLE FFR;
Join Date: Nov 2010
Posts: 6,343

Re: THE project euler thread
I was into this for a while but got bored. It's a lot of fun, though. Some of the later problems are very tricky.

10212011, 12:00 PM  #13 
Diana is my queen <3

Re: THE project euler thread
@leonid: I got an answer to #80 but I don't understand why it's not the correct answer. Can you help me figure out the problem in my code?
Just to see if there is something wrong in my code, I tried using my program to help me determine some values. Let's define the digital sum of the first 100 digits of radical n to be f(n). Are these values correct? I chose a few test numbers just to see if my program is telling me the right digital sum. It did tell me that f(2) = 475 which was given in the problem. f(3) = 441 f(7) = 398 f(35) = 440 f(69) = 439 f(95) = 460 Any help would be appreciated. Thanks!
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10212011, 12:35 PM  #14 
the Mathemagician~

Re: THE project euler thread
From what I can see, you seem to be rounding off your 100th decimal.

10212011, 01:47 PM  #15  
Diana is my queen <3

Re: THE project euler thread
Quote:
I don't think it's a rounding error because the 100th decimal digit of radical 2 is 7, which would round the 99th decimal digit up. When I created that set of digits, 2 was the last element of that set, so that doesn't seem to be the problem in my program.
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10212011, 02:17 PM  #16 
the Mathemagician~

Re: THE project euler thread
Let's take f(95). Its 100 digits are: (note my program counts backwards)
which gives a sum of 459. The 101st decimal is a 6, so if rounded up the 7, you would get to your answer of 460. And yes the problem isn't clear, but thanks to the example, you can understand they mean to have 100 significant digits. 
10212011, 06:20 PM  #17 
x'); DROP TABLE FFR;
Join Date: Nov 2010
Posts: 6,343

Re: THE project euler thread
hmm maybe I will get back into this
seeing leonid ahead of me is making my competitive core act up (by that I mean he could kick my ass at this shit but idgaf) heh solved problem 68 in excel Last edited by Reincarnate; 1182011 at 10:49 AM.. 
10212011, 07:37 PM  #18  
Diana is my queen <3

Re: THE project euler thread
Quote:
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10212011, 09:58 PM  #19 
FFR Player
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Age: 27
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Re: THE project euler thread
I think I'm going to get started with this. Wanted to work on my programming skills. On my reading week and nobody else I know is so why not. Probably going to work in C or Perl.

10212011, 10:25 PM  #20 
I am leonid
Join Date: Oct 2008
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Age: 30
Posts: 8,065

Re: THE project euler thread
Problem 96 is solving 50 sudoku problems. I'm very tempted to cheat

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