## Search found 533 matches

- Tue May 28, 2019 12:44 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 672
- Replies:
**2** - Views:
**1614**

### Re: Problem 672

Thanks for fixing that hk. Shouldn't there be a floor function around the $\frac{7^K-1}{11}$ term? I don't think there is a universally accepted meaning for a sum where the upper limit for the index variable is not an integer. Please investigate if $\frac{7^K-1}{11}$ isn't an integer for the values ...

- Tue May 28, 2019 11:35 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 672
- Replies:
**2** - Views:
**1614**

### Problem 672

Is "no nothing" a typo for "do nothing"?

Shouldn't there be a floor function around the $\frac{7^K-1}{11}$ term? I don't think there is a universally accepted meaning for a sum where the upper limit for the index variable is not an integer.

Shouldn't there be a floor function around the $\frac{7^K-1}{11}$ term? I don't think there is a universally accepted meaning for a sum where the upper limit for the index variable is not an integer.

- Mon May 27, 2019 12:40 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 671
- Replies:
**3** - Views:
**1016**

### Re: Problem 671

I have not solved this question yet, but have worked out F_4(3) on paper. @amagri: I believe those are indeed forbidden, so for both those reasons you cannot use a 1x3 tile when n=3. @MuthuVeerappanR: I think rotations around the axis of the loop are not considered different. I get 24+24+24+24+8 = 1...

- Mon May 20, 2019 12:31 am
- Forum: News, Suggestions, and FAQ
- Topic: Recover account
- Replies:
**4** - Views:
**351**

- Fri May 17, 2019 5:36 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 647
- Replies:
**2** - Views:
**840**

### Re: Problem 647

I know that quite some folk have solved this one already and it doesn't look too daunting, really - except that: well I'm getting 186 and not 184 as result for F_3(100). It really is 184. If you want, you can send me the pairs (A,B) that make up the sum by private message (you should have only four...

- Sat Mar 16, 2019 8:59 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 600
- Replies:
**1** - Views:
**175**

- Wed Mar 06, 2019 4:21 pm
- Forum: News, Suggestions, and FAQ
- Topic: Project Euler Style Sheet Update
- Replies:
**33** - Views:
**3129**

### Re: Project Euler Style Sheet Update

First, I don't know how to switch from the dark theme to light or vice versa. Is this missing, hidden, or am I just blind? In the Account tab, there is a section with Country, Language etc, including Theme. Change the Theme from Dark to Default (and click the Update Details button) to go back to wh...

- Mon Mar 04, 2019 9:30 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 425
- Replies:
**28** - Views:
**5752**

- Wed Feb 20, 2019 10:57 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 656
- Replies:
**9** - Views:
**654**

### Re: Problem 656

In the wording of the problem, I don't think it is a good idea to use the letter n for two different variables - first as the index of the sequence, then as an element of T. I think it would be better to change the second use to a variable named t for example.

- Mon Jan 28, 2019 10:31 am
- Forum: News, Suggestions, and FAQ
- Topic: désaccord sur décimales de sqrt(2)
- Replies:
**1** - Views:
**374**

- Sat Jan 12, 2019 10:00 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 196
- Replies:
**34** - Views:
**9217**

### Re: Problem 196

I've sent a private message.

- Mon Dec 24, 2018 5:49 am
- Forum: News, Suggestions, and FAQ
- Topic: Hairsplitting Curiosity (w/ Alliteration)...
- Replies:
**6** - Views:
**1259**

### Re: Hairsplitting Curiosity (w/ Alliteration)...

https://projecteuler.net/about=aliases If you hover over a poster's name in a solution thread (specifically the ones that are in italics, which indicates it is an alias), you will see a tooltip showing the account username. Unfortunately the quoting system always seems to display the username, not i...

- Sat Dec 15, 2018 5:48 am
- Forum: Discrete Mathematics
- Topic: Sorting...
- Replies:
**4** - Views:
**2550**

### Re: Sorting...

You have re-invented the Pigeonhole sort.

The wiki page on sorting algorithms has a separate section for non-comparison integer sorts like this. Its main disadvantage is that its running time and its memory requirements depend on max, not just on n.

The wiki page on sorting algorithms has a separate section for non-comparison integer sorts like this. Its main disadvantage is that its running time and its memory requirements depend on max, not just on n.

- Fri Nov 16, 2018 3:47 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 351
- Replies:
**13** - Views:
**6973**

### Re: Problem 351

If you ever need more than, say, 600MB of data, then you are probably doing it wrong. You are either using the wrong solving method, or maybe you just don't need to have all of that data in memory at the same time.

- Fri Nov 16, 2018 2:09 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 351
- Replies:
**13** - Views:
**6973**

### Re: Problem 351

Cheers Jaap, I'm afraid I'll have to confess my ignorance on the first question (I'll google that though). I do use vectors, yes, but I would have thought it would pose problems of efficiency too as it will take up a lot of memory. I'll try that approach over the weekend though and see what happens...

- Fri Nov 16, 2018 1:33 pm
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 640
- Replies:
**7** - Views:
**2346**

### Re: Problem 640

Sure, go ahead.LarryBlake wrote: ↑Fri Nov 16, 2018 12:55 pm@jaap, may I PM you my assumptions and a question? I believe I'm having the same difficulty tuple describes.

- Fri Nov 16, 2018 10:31 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 351
- Replies:
**13** - Views:
**6973**

### Re: Problem 351

On my system and using C/C++, defining an array this size immediately causes a 'Segmentation fault' - and the number spaces required only get larger on some of the more difficult problems on PE. Am I missing something? Do you know the difference between the stack and heap memory? Do you know how to...

- Thu Nov 08, 2018 10:30 am
- Forum: Clarifications on Project Euler Problems
- Topic: Problem 640
- Replies:
**7** - Views:
**2346**

### Re: Problem 640

It seems I'm having the same problem as tuple, as I get those answers too.

Edit: Solved it now. I had made an assumption that was not true in every situation, and from reading the problem's thread, many others did so too.

Edit: Solved it now. I had made an assumption that was not true in every situation, and from reading the problem's thread, many others did so too.

- Wed Oct 17, 2018 8:46 am
- Forum: Number
- Topic: "Fixed Points"
- Replies:
**5** - Views:
**5384**

### Re: "Fixed Points"

Oh, it's the unmistakable work of Raymond Smullyan. The strings we are working with are expressions. Just like an ordinary arithmetical expression like "4+5" can be evaluated to yield "9", these strings have their own type of arithmetic that can be used to evaluate them and yield another string. You...

- Tue Oct 16, 2018 6:30 am
- Forum: Number
- Topic: "Fixed Points"
- Replies:
**5** - Views:
**5384**

### Re: "Fixed Points"

In what case? In what context do you have strings that are also functions?kenbrooker wrote: ↑Mon Oct 15, 2018 9:47 pmIn this case, X is a string and X is a function, a function of itself.

It is hard to tell what misunderstandings you might have if you don't show the original text that you might be misunderstanding.