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#! /usr/bin/env raku
subset PosInt of Int where * >= 1;
unit sub MAIN (PosInt $N, :$v, :$verbose = :$v);
class LinkedElement
{
has $.value;
has $.next is rw;
method print-list
{
print self.value;
if self.next
{
print " -> ";
self.next.print-list;
}
else
{
print "\n";
}
}
method list-length
{
my $length = 1;
my $current = self.next;
while ($current)
{
$current = $current.next;
$length++;
}
return $length;
}
method remove-from-end($from-the-end)
{
my $length = self.list-length;
if $length == 1
{
die "[]";
}
elsif $from-the-end > $length
{
self = self.next;
}
else
{
my $current = self;
for 1 .. ($length - $from-the-end -1)
{
$current = $current.next;
}
$current.next = $current.next.next;
}
}
}
my $length = (1..50).pick;
my $head;
my $current;
for 1..$length -> $value
{
my $new = LinkedElement.new(value => $value);
if $current
{
$current.next = $new;
$current = $current.next;
}
else # Initially
{
$head = $new;
$current = $head;
}
}
$head.print-list;
say "Length: ", $head.list-length if $verbose;
$head.remove-from-end($N);
$head.print-list;
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