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Re: SuDoKu solver

by NetWallah (Canon)
on Jul 18, 2005 at 03:32 UTC ( [id://475630]=note: print w/replies, xml ) Need Help??


in reply to SuDoKu solver

Cool code (++)!

I was attempting to re-write the $grid array-ref initialization in a more "Lazy" manner, using the "x" operator, but the implementation of that operator optimizes in such a way that the operand gets evaluated only once. I had to settle on "map" : 

my $grid=[ map {[  map {$init} 1..9   ]}   1..9  ];

[download]
If anyone can accomplish this using the "x" operator in a non-obfu way, I'd love to hear it.

     "Income tax returns are the most imaginative fiction being written today." -- Herman Wouk

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Re^2: SuDoKu solver
by jmcnamara (Monsignor) on Jul 18, 2005 at 08:06 UTC

    I initially wrote this and it appeared correct according to Test::More::is_deeply(). However, despite the test, it is wrong since the inner array ref is copied rather than recreated (which is probably what you are alluding to above). 
        my $grid = [([($init) x 9]) x 9]; # ! wrong

    [download]

    So, perhaps somethings like this: 

        my $grid = [map {[($init) x 9]} 1..9];

    [download]

    I was really addicted to Sudoku puzzles a few weeks ago, but I'm finally getting my life back. :-)

    --
    John.

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