|
use 5.20.0;
|
|
|
|
use base 'Exporter';
|
|
|
|
use experimental 'signatures';
|
|
|
|
our @EXPORT = qw/ path /;
|
|
|
|
say path(shift) unless caller;
|
|
|
|
sub path($x) {
|
|
my $i = 1;
|
|
|
|
return 0 if $x == 1;
|
|
|
|
$i+=2 until $x <= $i**2;
|
|
|
|
my $j = ( $x - ($i-2)**2 ) % ($i-1);
|
|
|
|
($i-1)/2 + abs( $j - ($i-1)/2 );
|
|
}
|
|
|
|
1;
|