Search found 261 matches

by harryh
Tue May 18, 2010 5:36 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 248
Replies: 6
Views: 3207

Re: Problem 248

The 150,000th number n for which φ(n) = 13!
by harryh
Tue May 18, 2010 4:56 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 289
Replies: 26
Views: 9041

Re: Problem 289

Don't hate anything /anyone, is what I would suggest. :) Imho, whatever someone or some people do to submit an answer (cooperating or copy-pasting or whatever) does not affect at all the quality of the problems, the insights one gets through researching their essence and the pleasure of finding an e...
by harryh
Sat May 08, 2010 11:47 am
Forum: News, Suggestions, and FAQ
Topic: Typo in Problem 75's blurb - "can that can"
Replies: 1
Views: 1224

Re: Typo in Problem 75's blurb - "can that can"

Good spot! There were too many cans there :lol:
Fixed now.
by harryh
Tue Apr 27, 2010 3:54 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 108 / 110
Replies: 16
Views: 6093

Re: Problem 108 / 110

In both Problem 108 (View Problem) and Problem 110 (View Problem) 1/n must be expressed as a sum of exactly two fractions 1/x and 1/y (not an arbitrary number of such fractions).
by harryh
Tue Apr 27, 2010 3:32 pm
Forum: News, Suggestions, and FAQ
Topic: Surrender!
Replies: 4
Views: 1463

Re: Surrender!

@BAbdulBaki : If someone wishes to cheat, wouldn't the "give up" link make it too easy to do so? (I could use two accounts: one to "give up" on every problem, and one to submit the solutions :wink: ). However, my main objection has nothing to do with cheaters (if they are sufficiently determined, th...
by harryh
Tue Apr 27, 2010 7:22 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 289
Replies: 26
Views: 9041

Re: Problem 289

Number of solvers after 24h, 48h, 72h, 96h, 120h for a few relatively recent problems with a small number of solutions :

#257 : 9, 17, 20, 25, 27
#261 : 8, 17, 25, 30, 35
#264 :10, 17, 21, 25, 37

From problem number #277 onwards, the fastest-20 list provides a pretty good indication... :)
by harryh
Sat Apr 24, 2010 6:54 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 289
Replies: 26
Views: 9041

Re: Problem 289

Yep, L(11,2)=5539780352 (mod 10^10) looks correct :D
by harryh
Fri Apr 16, 2010 4:54 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 079
Replies: 9
Views: 3141

Re: Problem 079

Good spot; changed it to "they may ask for the 2nd, 3rd ..." (meaning that the security system(s) may ask...)

Before starting a new topic, please make sure that the topic of a particular problem does not already exist (otehrwise this forum becomes extremely mess...)
by harryh
Mon Apr 12, 2010 12:42 pm
Forum: Recreational
Topic: Level 1!
Replies: 1
Views: 1428

Re: Level 1!

Well done! Congrats :D
by harryh
Sat Apr 10, 2010 10:35 am
Forum: News, Suggestions, and FAQ
Topic: Bug in Number of solvers
Replies: 2
Views: 1298

Re: Bug in Number of solvers

No. The fastest solvers table is "live" in the sense that it gets updated as soon as another solution is accepted. On the other hand, the problems table is updated every hour (at the top right of the table, it shows the time of the next update). For problem #287, it shows "Solved By 15", because tha...
by harryh
Sat Apr 03, 2010 8:04 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 285
Replies: 17
Views: 10231

Re: Problem 285

Good spot ! There is a mistake in the given example; it will be fixed soon.

Edit: Typos fixed. The actual values are a=0.2, b=0.85, calculated sum=42.05, sq.root=6.484...
by harryh
Sun Feb 28, 2010 10:20 am
Forum: News, Suggestions, and FAQ
Topic: How do you guys do it?
Replies: 3
Views: 1904

Re: How do you guys do it?

Another often quoted bit of advice is this: Take the problems in order . For each problem you solve, go through the forum that opens when you submit the correct answer. Concentrate on those methods, algorithms and approaches that seem to be much more efficient than the one you've used. Implement wha...
by harryh
Sun Feb 28, 2010 10:07 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 280
Replies: 9
Views: 3971

Re: Problem 280

Hello, I have a question: It seems like you have four questions :) This is a valid starting position: 00000 00000 00000 00000 11111 Yes. This is a valid endgame position: 11111 00000 00000 00000 00000 Yes. Is this a valid endgame position? 00005 00000 00000 00000 00000 No: The problem statement say...
by harryh
Sat Feb 27, 2010 9:26 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 280
Replies: 9
Views: 3971

Re: Problem 280

Every seed is dropped on the fifth row (counted from the bottom).
by harryh
Tue Feb 02, 2010 4:27 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 276
Replies: 31
Views: 9534

Re: Problem 276

No, it is not. The dotted line below gcd(a,b,c) in the problem description, means a tooltip explanation. Hovering your mouse over it, you'll see:
p276.gif
p276.gif (3.64 KiB) Viewed 6759 times
Good luck!
by harryh
Tue Feb 02, 2010 2:06 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 276
Replies: 31
Views: 9534

Re: Problem 276

That rule applies only to right-angle triangles. Problem 276 (View Problem) poses no such restriction.
Yes and yes (for the last two questions).
by harryh
Mon Feb 01, 2010 4:27 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 276
Replies: 31
Views: 9534

Re: Problem 276

GCD(x,x)=x always (irrespective of whether x is prime or not)
by harryh
Sat Jan 30, 2010 9:38 am
Forum: News, Suggestions, and FAQ
Topic: Missing from Eulerians list
Replies: 3
Views: 1689

Re: Missing from Eulerians list

Well, you are an Eulerian now Konrad127123 :D (though I'm still a bit puzzled by what caused it).
by harryh
Sat Jan 30, 2010 9:17 am
Forum: News, Suggestions, and FAQ
Topic: Missing from Eulerians list
Replies: 3
Views: 1689

Re: Missing from Eulerians list

I've solved 13 or the latest 25 problems, but I'm not listed on the Eulerians scoreboard (I have waited for it to update). That's odd; I'm not sure of the reason, but we'll look into it. ... harryh is listed as last solving a problem ...I realise he's a problem development team leader, so that may ...
by harryh
Wed Jan 27, 2010 4:45 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 275
Replies: 24
Views: 5889

Re: Problem 275

A couple of people seem to have solved it (initially, at least) by slow methods, taking from one to three hours. Most of those who posted methods and code used more efficient approaches (of the order of one to five minutes). As usual, there are some solutions requiring less than 10 sec; to the best ...