Search found 145 matches

by MuthuVeerappanR
Tue Apr 28, 2020 3:28 pm
Forum: News, Suggestions, and FAQ
Topic: Removing incentive for spoilers
Replies: 14
Views: 2565

Re: Removing incentive for spoilers

Hi vamsikal3, It's been a while we had a chat. Hope you are doing good.. Regarding the discussion here, I think you've put it nicely here. ... So, if unlocking problems that I cannot solve after spending a few days on it helps me learn/understand new mathematics or programming techniques. I believe ...
by MuthuVeerappanR
Mon Apr 27, 2020 9:22 am
Forum: News, Suggestions, and FAQ
Topic: Suggestion - save to clipboard when posting?
Replies: 10
Views: 1676

Re: Suggestion - save to clipboard when posting?

Great feature euler. Came in handy today.. A big thanks!!
by MuthuVeerappanR
Fri Apr 17, 2020 6:58 pm
Forum: Programming languages
Topic: Any Mathematica tricks to share?
Replies: 2
Views: 800

Re: Any Mathematica tricks to share?

The undocumented Algebra`MatrixPowerMod. Useful in many PE problems.
by MuthuVeerappanR
Sun Feb 16, 2020 8:47 am
Forum: News, Suggestions, and FAQ
Topic: easier new problems?
Replies: 5
Views: 1176

Re: easier new problems?

This post has a lot people sharing their experience at your (or our) stage.

I've also listed some topics in the above thread which can help in solving many PE problems.

Happy Solving!!
by MuthuVeerappanR
Sun Aug 25, 2019 7:34 pm
Forum: News, Suggestions, and FAQ
Topic: Username not known
Replies: 9
Views: 1272

Username not known

Hi, For some reason, I can't login to my account. PE says 'Username not known'.

Can anyone let me know why this is happening?
by MuthuVeerappanR
Wed Aug 21, 2019 3:55 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 613
Replies: 9
Views: 3586

Re: Problem 613

It's just a mathematical description RishadanPort. To make it more abstract, if you randomly select a point inside a right angled triangle and randomly choose some direction to draw a line (starting from the point we chose), what is the probability that the line intersects the hypotenuse?
by MuthuVeerappanR
Fri Jun 28, 2019 6:15 am
Forum: News, Suggestions, and FAQ
Topic: Errors/Warnings/Bugs
Replies: 541
Views: 129532

Re: Errors/Warnings/Bugs

We cannot make two consecutive posts in the same solution forum. I think you should be able to edit your post and add the content in the same post.
by MuthuVeerappanR
Mon May 27, 2019 11:33 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 671
Replies: 3
Views: 3740

Re: Problem 671

671 Hi All, Tiling which are identical after rotating the loop about its axis considered different? Only if I consider them different, I get F_4(3) = 104. Else am stuck at 92. I'm not sure whether 'reflecting horizontally or vertically would give a different tiling, these tilings are to be counted ...
by MuthuVeerappanR
Mon May 06, 2019 9:17 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 272
Replies: 14
Views: 9203

Re: Problem 272

Hi mdean,
If you could PM your value, I can confirm it.
by MuthuVeerappanR
Tue Mar 05, 2019 4:43 pm
Forum: News, Suggestions, and FAQ
Topic: Project Euler Style Sheet Update
Replies: 33
Views: 12177

Re: Project Euler Style Sheet Update

The kudos count is aligned properly now. Kudos for that euler...
by MuthuVeerappanR
Mon Mar 04, 2019 12:59 am
Forum: News, Suggestions, and FAQ
Topic: Project Euler Style Sheet Update
Replies: 33
Views: 12177

Re: Project Euler Style Sheet Update

Many thanks to the PE team for the new style. The site looks great with the new styling.

The only issue that I saw was as that of MHealy. For non-permananent posts, the kudos are slightly mis-aligned in Chrome.

Truly appreciate the hard work in getting PE a new style.
by MuthuVeerappanR
Tue Nov 27, 2018 10:29 am
Forum: News, Suggestions, and FAQ
Topic: Errors/Warnings/Bugs
Replies: 541
Views: 129532

Re: Errors/Warnings/Bugs

For me the problem appears in Chrome but not in IE...
by MuthuVeerappanR
Tue Nov 27, 2018 4:42 am
Forum: News, Suggestions, and FAQ
Topic: Errors/Warnings/Bugs
Replies: 541
Views: 129532

Re: Errors/Warnings/Bugs

Now I have this problem...

If I try to view my posts from 173-180, then am directed to the sign-in page even though am not signed-out of PE.
by MuthuVeerappanR
Fri Aug 24, 2018 5:14 am
Forum: Programming languages
Topic: which compiler to use for c++ programs
Replies: 2
Views: 5922

Re: which compiler to use for c++ programs

Like v6ph1 said, if you are looking for online compilers, repl is my favourite..
by MuthuVeerappanR
Fri Aug 10, 2018 6:52 am
Forum: Number Theory
Topic: An Infinite Prime Number Generator
Replies: 5
Views: 7430

Re: An Infinite Prime Number Generator

I changed the code to remove the loop-checking and use modified-step values but still no improvements in timing. For example, the mod-2 version takes ~ 75 secs to list all primes upto 10^8, the mod-6 version takes ~ 85 secs whereas the step-adjusted-mod-6 version takes ~ 95 secs. step-adjusted-mod-6...
by MuthuVeerappanR
Thu Aug 09, 2018 1:00 pm
Forum: Number Theory
Topic: An Infinite Prime Number Generator
Replies: 5
Views: 7430

Re: An Infinite Prime Number Generator

Thanks v6ph1. I too arrived at the same loop for making the program slow. But I think it may be slightly different. Rather than the loop checking, I think the runs more often as the chance of hitting the numbers with mod in the given set becomes low. That I think is the trade-off in the higher mod v...
by MuthuVeerappanR
Thu Aug 09, 2018 4:51 am
Forum: Number Theory
Topic: An Infinite Prime Number Generator
Replies: 5
Views: 7430

An Infinite Prime Number Generator

Hi all, I recently saw a post on an Infinite Prime Number Generator on Stack Exchange given below. from itertools import count from timeit import default_timer start = default_timer() # ideone.com/aVndFM def postponed_sieve(): # postponed sieve, by Will Ness for c in (2, 3, 5, 7): # original code Da...
by MuthuVeerappanR
Tue Jul 10, 2018 2:59 pm
Forum: Number
Topic: an old maths olympiad question
Replies: 28
Views: 20308

Re: an old maths olympiad question

@ jaap , I think you did all the heavy lifting leaving just the algebra to me. The key to solving this problem is to pick the 'central angle' as the variable of interest. Though the 'cubic' approach ended nowhere, it reminded me of the trick of evaluating $\sin(\pi/5)$ exactly, which I kinda used to...
by MuthuVeerappanR
Tue Jul 10, 2018 12:13 pm
Forum: Number
Topic: an old maths olympiad question
Replies: 28
Views: 20308

Re: an old maths olympiad question

... It is straightforward to see that: A1A2 = 2sin(x) A1A3 = 2sin(2x) A1A4 = 2sin(3x) From here, we have, $\displaystyle\frac{1}{\sin x}=\frac{1}{\sin 2x}+\frac{1}{\sin 3x}$ $\displaystyle\sin 2x=\frac{\sin x \sin 3x}{\sin 3x-\sin x}=\frac{\sin x \sin 3x}{2\sin x-4 \sin^3 x}=\frac{\sin x\sin 3x}{2 ...
by MuthuVeerappanR
Tue Jun 12, 2018 12:00 pm
Forum: Combinatorics
Topic: Die and matchsticks game from 'The Goal'
Replies: 0
Views: 10065

Die and matchsticks game from 'The Goal'

Hi All, This post is about an analysis of a game described in Goldratt's best seller 'The Goal'. The game is as follows: Consider $b$ bins of infinite capacity in a row with an imaginary Source of infinite matchsticks. Matchsticks are transferred to the bins in the following manner: For every bin, m...