Search found 338 matches

by rayfil
Sat Aug 28, 2021 6:14 pm
Forum: Resources
Topic: Coding to convert natural binary numbers to music
Replies: 2
Views: 75

Re: Coding to convert natural binary numbers to music

Many years ago, a group related to fractals was much more active. Some of the members had reported using the results to produce music. You may want to contact one of the 'still active' members, David Fisher (sunfish61 at protonmail dot com), who may be able to give you more information about where t...
by rayfil
Sun Jun 27, 2021 6:26 pm
Forum: Resources
Topic: Resouces to get better at solving Project Euler problems?
Replies: 6
Views: 258

Re: Resouces to get better at solving Project Euler problems?

FIRST : Most problems need a sufficient level of math knowledge to be able to design a computer program to solve it. If your knowledge is presently limited to basic high school math, it may be sufficient for many of the initial 200-300 published problems. With the age of the internet, you may be ab...
by rayfil
Wed Jun 23, 2021 6:31 pm
Forum: Resources
Topic: Resouces to get better at solving Project Euler problems?
Replies: 6
Views: 258

Re: Resouces to get better at solving Project Euler problems?

FIRST : Most problems need a sufficient level of math knowledge to be able to design a computer program to solve it. If your knowledge is presently limited to basic high school math, it may be sufficient for many of the initial 200-300 published problems. With the age of the internet, you may be ab...
by rayfil
Sat May 23, 2020 7:19 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 059
Replies: 114
Views: 50533

Re: Problem 059

Do I understand the problem correctly? That is hard to tell from your own description. Let's restart using your own data and hk's suggestion. - First let's "encrypt" your HELLO WORLD with your encryption key 'abc'. Rotating the key for XORing each character of the message, the end result ...
by rayfil
Thu May 14, 2020 3:33 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 008
Replies: 102
Views: 42018

Re: Problem 008

I know that there are 6 pages related to this particular problem but you were not aware of them before your first comment. Problem numbers need to be padded up front with 0's for easier search. Conclusion: Many others have had their comments/questions, and possible answers to them. Suggestion: Go th...
by rayfil
Sat Sep 07, 2019 1:16 am
Forum: News, Suggestions, and FAQ
Topic: Errors/Warnings/Bugs
Replies: 647
Views: 226900

Re: Errors/Warnings/Bugs

He most probably mean images normally displayed as part of someone's signature at the very bottom of each post. I can't see those images either, appearing only as an image icon with the title "image". A link had been posted by Jochen_P previously in this thread on Wed, 21 Aug 2019. That li...
by rayfil
Fri Jul 26, 2019 3:13 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 432
Replies: 7
Views: 4292

Re: Problem 432

Another way of saying "last 9 digits" would be mod(1,000,000,000).
by rayfil
Wed Jan 23, 2019 3:06 am
Forum: News, Suggestions, and FAQ
Topic: Weird runtime behavior
Replies: 8
Views: 4606

Re: Weird runtime behavior

As LilStalker pointed out, the timing differences should not be considered significant. And: with the "else if(i % 2 == 0) return false;" instruction in your IsPrime function, you were disregarding further processing of all even numbers anyway. (BTW, that instruction becomes redundant in y...
by rayfil
Thu Nov 15, 2018 4:11 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 008
Replies: 102
Views: 42018

Re: Problem 008

This seems to leave you with at least two choices if you want to continue enjoying solving problems on Project Euler. i.e.: A. Continue learning how to use the C programming language. Many other participants have already succeeded solving those problems using that language. B. Start learning some ot...
by rayfil
Tue Aug 15, 2017 5:10 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 054
Replies: 74
Views: 36330

Re: Problem 054

th72
Send me a PM with your list and I'll try to have a look at it.
by rayfil
Wed May 03, 2017 6:17 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 054
Replies: 74
Views: 36330

Re: problem 54 needs updated wording

Being a new member on this forum, please be advise that problem numbers are listed with leading "0s" to provide a 3-digit number in order to facilitate archiving and easier searching.
by rayfil
Fri Sep 30, 2016 10:21 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 173 & 174
Replies: 41
Views: 19292

Re: Problem 173 & 174

The example simply shows you two different ways (not ONE unique way) which would produce a square lamina as defined, using 32 square tiles. Those two would be part of the 41 different hollow laminea you could produce when you use any quantity of square tiles up to 100 in Problem 173.
by rayfil
Wed Aug 31, 2016 5:18 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 210
Replies: 70
Views: 34875

Re: Problem 210

Steve N If your 'long' is a 64-bit float, have a look at this previous post on page 2 of this thread (http://projecteuler.chat/viewtopic.php?f=50&t=1111&start=15#p10571) and also at japp's post at the very top of the same page. I know it's a long thread (5 pages) but you would most probably ...
by rayfil
Wed May 04, 2016 5:50 pm
Forum: News, Suggestions, and FAQ
Topic: LinkedIn integration
Replies: 1
Views: 2027

Re: LinkedIn integration

It would be nice to be able to post level and/or other badges as certification PE cannot certify anything. There are too many on-line sites where one can get answers to PE problems and PE has no means to verify the honesty of those entering answers. YOU are the only one who really knows what you ma...
by rayfil
Sat Apr 02, 2016 12:47 am
Forum: News, Suggestions, and FAQ
Topic: post solution
Replies: 4
Views: 4724

Re: post solution

how or where do I post a private thread or a new thread? This all depends on the subject you want to cover in such a thread. If related to a specific PE problem: - You cannot start any new thread on the main PE site; you can only post in the existing problem thread after you have solved the problem...
by rayfil
Fri Jan 02, 2015 6:42 pm
Forum: Programming languages
Topic: Assembly - push/pop registers
Replies: 4
Views: 5851

Re: Assembly - push/pop registers

I'm aware that under Windows one should push the registers ebx/edi/esi prior to facilitating .... This used to be true up to Win98. Windows seemed to drop that requirement starting at least with WinXP. I can remember one program I wrote where I popped the esi/edi registers in the wrong order and th...
by rayfil
Wed Dec 17, 2014 4:50 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 103
Replies: 38
Views: 16572

Re: Problem 103

You seem to have forgotten the 2nd rule, i.e.
ii . If B contains more elements than C then S(B) > S(C).

7+8+9 = 24 while 11+14 = 25
by rayfil
Fri Dec 12, 2014 4:31 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 008
Replies: 102
Views: 42018

Re: Problem 008

abc
def
ghi
But they must also be on the same line if you are looking at more than two items. Thus for three adjacent items, the only candidates would be:
abc, aei, adg, beh, ceg,cfi, def and ghi.
by rayfil
Mon Aug 04, 2014 4:50 am
Forum: News, Suggestions, and FAQ
Topic: How to access the PDF containing answer explanations ?
Replies: 2
Views: 6304

Re: How to access the PDF containing answer explanations ?

At this time, you can't. For your info, in case you are not yet aware of it, the site was hacked a few weeks ago and was shut down as soon as it was discovered. It is being rewritten to make it more secure and hopefully will become available within the next few weeks along with the PDFs.
by rayfil
Fri Jul 11, 2014 1:22 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 132
Replies: 6
Views: 4778

Re: Problem 132

cshung wrote:The first forty "smallest" prime factors?
Correct.