Talk:N-queens problem

Is the goal to find one solution, or all solutions? --164.67.235.98 19:59, 12 September 2009 (UTC)

Tcl: All Solutions

I've put up code to find all solutions; finding just one is a trivial adaptation of that (stop iterating after the first solution is found...) —Donal Fellows 20:37, 12 September 2009 (UTC)

Python permission

I thought I might copy the email trail where I got permission to post a Python solution from its original author:

Subject:
Re: 8-Queens
From:
Steve Howell <showell30@YY.com>
Date:
Mon, 14 Sep 2009 23:07:09 -0700 (PDT)
To:
Paddy McCarthy <paddy3118@XX.net>

Thanks!

--- On Mon, 9/14/09, Paddy McCarthy <paddy3118@XX.net> wrote:


    From: Paddy McCarthy <paddy3118@XX.net>
    Subject: Re: 8-Queens
    To: "Steve Howell" <showell30@YY.com>
    Date: Monday, September 14, 2009, 11:54 AM

    Ta very much. It's in place.

    Steve Howell wrote:
>     Please do, thank you.
>
>     Sent from my iPhone
>
>     On Sep 13, 2009, at 10:43 AM, Paddy McCarthy <paddy3118@XX.net> wrote:
>
>>     Hi,
>>     I wondered if you would allow me to submit your 8-Queens solution to  Rosetta  Code ?
>>
>>
>>     -- Donald 'Paddy' McCarthy
>>     http://paddy3118.blogspot.com/

--Paddy3118 04:28, 6 September 2010 (UTC)

Removing existing C code: webbug?

I added a C solution, then realized the existing C example is sending results to some http server. This amounts to a web bug, I'm removing it, until the intent of the webbug can be clarified and justified --Ledrug 03:34, 6 July 2011 (UTC)

Apparently the ip address is somewhere in germany, on a machine owned by 23media.eu. Also, a google search finds http://forum.chip.de/c-net/c-code-socket-laeuft-1443464.html which suggests that this is a machine that at one point was owned by Leonie Schöller. Then again, http://178.77.72.203/wbb2/thread.php?postid=3648536 suggests a machine owned by someone named Manuela. --Rdm 04:44, 6 July 2011 (UTC)

Whoever it was, that was a fairly odd thing to do: it's not like code here gets compiled and run very often-- —Ledrug 05:25, 6 July 2011 (UTC)

REXX mistake

I'm not familiar with REXX, nor do I have any idea how to fix it; however, the two outputs produced (for board sizes 8 and 20) are both unsuccessful attempts at nqueens. In the 8x8 board, rows 4 and 6 (1-up) have queens in diagonal contradiction; in the 20x20 board, (at least, didn't bother to check more) rows 1 and 6 have queens in diagonal contradiction.

Anyone familiar enough to know whether this is a printing error or a solving error, and either way, how to fix it?