Search found 68 matches

by RobertStanforth
Sat Oct 07, 2017 5:23 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 605
Replies: 9
Views: 3378

Re: Problem 605

guy.scrum wrote: Sat Oct 07, 2017 4:12 pm Is there some subtlety to the rules that I'm not appreciating?
Remember that the game ends when the same player wins twice in a row.
by RobertStanforth
Wed Sep 27, 2017 7:12 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 610
Replies: 18
Views: 9067

Re: Problem 610

'CM' is indeed considered a lower denomination than 'M', which is how 'CMD' is excluded by the second rule in the About page.
Using a symbol (other than 'M') five times will also violate that rule as it will equal or exceed the next greater symbol.
by RobertStanforth
Wed Sep 06, 2017 8:17 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 281
Replies: 7
Views: 4071

Re: Problem 281

Hi Jarlsberg,
I've edited your post to remove the values, and sent you a PM.
Robert
by RobertStanforth
Sat Feb 04, 2017 9:59 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 586
Replies: 13
Views: 5034

Re: Problem 586

Did I understand correctly? For example, we have k=948146020152320. It has 41 solutions, one of which a=b. Therefore 40 different solutions. So we have to count this number. Thats right? Andr_Sml is correct. If a number has exactly 40 solutions that satisfy the given constraint $a>b>0$ (and one tha...
by RobertStanforth
Sun Oct 25, 2015 12:50 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 531
Replies: 10
Views: 6300

Re: Problem 531

Interpret it instead as x%4=2 and x%6=4.
by RobertStanforth
Mon Sep 07, 2015 8:27 am
Forum: News, Suggestions, and FAQ
Topic: Global Ranking
Replies: 15
Views: 10035

Re: Global Ranking

You can infer it from the "Solved at least" column on the "How many problems are members solving" stats page:
https://projecteuler.net/problem_analysis
by RobertStanforth
Tue Jun 09, 2015 8:24 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 502
Replies: 17
Views: 9914

Re: Problem 502

Condition 6 states that the castle is made from an even number of BLOCKS. Your list contains castles with an even number of GRID CELLS. For example, the third castle in your list contains 6 grid cells but 3 blocks.
by RobertStanforth
Mon Jun 16, 2014 10:36 pm
Forum: Recreational
Topic: Car, cans and the desert
Replies: 1
Views: 2190

Re: Car, cans and the desert

I love this problem. I came across it several years ago as "Crossing the Desert" in Martin Gardner's 2nd Scientific American book of Mathematical Puzzles & Diversions. This is actually very closely related to one of the Euler problems, so probably best not to give away the general solu...