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Hi again,

BTW, nice post, Lysander, I really got hung on that one...

Below is my quickshot version. Of course, a serious version of this would need input checks, etc., etc. I was just courious how I'd do this in a generalized way, using a flat array (like a talon of cards). This version allows for matrices of arbitrary dimensions.

The print_matrix sub should therefore also be generic for all (quadratic) arrays -- where sqrt(@array) returns a natural number (an integer).

```#!/usr/bin/perl

use strict;

my \$dimension = shift || 4;

my @card_matrix = (1 .. \$dimension ** 2);

print_matrix(@card_matrix);
print "\nrow? : "; my \$row = <STDIN>; chomp(\$row);

print_matrix(reverse @card_matrix);
print "\ncol? : "; my \$col = <STDIN>; chomp(\$col);

print "\nsolution: ",
\$card_matrix[(\$row - 1) * \$dimension + (\$dimension - \$col)];

sub print_matrix
{
my @matrix = @_;

my \$dimension = sqrt(@matrix);

printf "\n" . "\t[%d]" x \$dimension, (1..\$dimension);

for(my \$row = 0; \$row < \$dimension; \$row++)
{
printf "\n[%d]" . "\t%d" x \$dimension,
\$row + 1, @matrix[\$row * \$dimension .. \$row * \$dimension
++ \$dimension - 1];
}
}

So long,
Flexx

In reply to Re: Perl Card Trick by Flexx
in thread Perl Card Trick by Lysander

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