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).
my $dimension = shift || 4;
my @card_matrix = (1 .. $dimension ** 2);
print "\nrow? : "; my $row = <STDIN>; chomp($row);
print "\ncol? : "; my $col = <STDIN>; chomp($col);
print "\nsolution: ",
$card_matrix[($row - 1) * $dimension + ($dimension - $col)];
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];
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