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8x8 no-op with negative numbers
http://www.calcudoku.org/forum/viewtopic.php?f=16&t=688
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Author:  pnm  [ Sun Apr 26, 2015 12:20 pm ]
Post subject:  8x8 no-op with negative numbers

Accidentally [scared] created this one:

Image

Author:  pharosian  [ Sun Apr 26, 2015 6:56 pm ]
Post subject:  Re: 8x8 no-op with negative numbers

-4 to 4, I presume?

Author:  pnm  [ Sun Apr 26, 2015 7:46 pm ]
Post subject:  Re: 8x8 no-op with negative numbers

pharosian wrote:
-4 to 4, I presume?

-4 to 4, now let me think... [glare]

Author:  pharosian  [ Wed Apr 29, 2015 3:26 am ]
Post subject:  Re: 8x8 no-op with negative numbers

I sense sarcasm there. [razz]

But really, now that I think a bit more on it, a -4 to 4 puzzle would by 9x9, so what IS the range for this one? Or is figuring that out part of the puzzle?

Author:  pnm  [ Wed Apr 29, 2015 8:43 am ]
Post subject:  Re: 8x8 no-op with negative numbers

pharosian wrote:
But really, now that I think a bit more on it, a -4 to 4 puzzle would by 9x9, so what IS the range for this one? Or is figuring that out part of the puzzle?

I'm actually not 100% sure you can figure out the range from the puzzle,
but my guess is it should be possible.

Edit: looking at the puzzle, it's quite easy, there's a "-9" and a given "4".

The 4 tells you the smallest possible negative number is -3, etc.

Author:  nicow  [ Wed Apr 29, 2015 11:48 am ]
Post subject:  Re: 8x8 no-op with negative numbers

I found a solution. Not sure if it is the only one.

Author:  beaker  [ Wed Apr 29, 2015 7:22 pm ]
Post subject:  Re: 8x8 no-op with negative numbers

Still not sure about the range of numbers used........is it obvious.........like -3 to +4?

Author:  nicow  [ Thu Apr 30, 2015 10:43 am ]
Post subject:  Re: 8x8 no-op with negative numbers

Yes, Beaker, that is the range I found too.

Author:  clm  [ Thu Apr 30, 2015 11:35 pm ]
Post subject:  Re: 8x8 no-op with negative numbers

nicow wrote:
Yes, Beaker, that is the range I found too.


The solution I found is unique with respect to numbers I have considered but not unique with respect to operators, as usual in no-ops, in fact the cage "0" c1-c2-d1 admits up to 3 different operators (+, x, :). However I did not try "many" different sets of numbers, continuous of course, since I believe that actually the software is not able to generate puzzles with skipped numbers :-).

Author:  pnm  [ Fri May 01, 2015 8:43 am ]
Post subject:  Re: 8x8 no-op with negative numbers

clm wrote:
However I did not try "many" different sets of numbers, continuous of course, since I believe that actually the software is not able to generate puzzles with skipped numbers :-).

That is correct.

It is the next step for the software, puzzle with arbitrary sets of numbers [scared]

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