Remember that lame-ass math puzzle thread?

[Shoden]

What a way to put it XD.


I'm kinda slow at this stuff but I can do them.

[rubah]

I think they have pills for that stuff, Unne.

[Dr Unne]

My Sudoku solver: http://chwombat.net/perl-sudoku.php (obviously in Perl). I just wasted two and a half hours on it. They probably have pills for that, too.

[Del Murder]

I do these at work sometimes when it gets slow. They're fun.

[Tasura]

I bought a book of them after thanksgiving so id have something to do at university.

[Del Murder]

The problem with these is that they get boring after a while since it's pretty much the same thing over and over again.

[-N-]

Then try and time yourself.

[Shoden]

Took me 15 mins on my 2nd try. Gah

[Del Murder]

I will if I get bored. Here's some questions:

1. How many unique 9X9 Sudoku squares are there?

2. What is the minimum number of numbers you need to have to make a unique 9X9 Sudoku square?

[Optium]

Ya, this game is pretty awesome. Not very mathy though. :o

9 minutes on the hardest level was my best time I think, but I was talking
to a friend online at the time, I should try again without any distractions.

.opt

[Dr Unne]

So you can get less than half the average time, while distracted. How? How long have you been playing?

[Optium]

So you can get less than half the average time, while distracted. How? How long have you been playing?

Yes. And about a total of an hour. I did evil after playing the easy one 3
times. It was all in the same sitting. It was last Friday. Just played Evil
again without any real distractions unless you count parents, music, and
making food, but I wasn't actually IMing someone, and I noticed the pause
button this time so I paused it to stir/drain/eat my pasta.

.opt

[-N-]

That's obscene. I'm still proud of my 8'36" medium. I'll work my way up eventually.

Murder - I assume you're talking about creating Sudoku puzzles. I don't know exactly, but I think this quote from Wikipedia might help.

[q=Wikipedia article on Sudoku]If an efficient solver is available, there is a very simple method of automatic construction: randomly add a digit to the grid, and then look for a solution. If no solution is found, remove the digit and try another. If a solution is found, look for a different solution. If there is no other solution, the starting grid is complete; otherwise, repeat this process.[/q]

edit: Hooray 4'28" on easy time for class now.

[Endless]

The question is, was that grid valid at all times or did you use trial and error?

A very, very easy way to generate a valid sudoku (filled grid) is:
<pre>
a b c d e f g h i
g h i a b c d e f
d e f g h i a b c
i a b c d e f g h
f g h i a b c d e
c d e f g h i a b
h i a b c d e f g
e f g h i a b c d
b c d e f g h i a
</pre>

[Tasura]

i got bored in calc so i made 3 i think that work.