51 lines
770 B
Perl
51 lines
770 B
Perl
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use 5.20.0;
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my $path = <>;
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chomp $path;
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my %path;
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$path{$_}++ for split ',', $path;
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use DDP;
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my %d = (
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n => [ 0,1],
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s => [ 0,-1],
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e => [ 1, 0],
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w => [ -1,0],
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);
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use experimental 'postderef', 'signatures';
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for my $y ( qw/ n s / ){
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for my $e ( qw/ e w / ){
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$d{"$y$e"} = [ map { $_/2 } add( $d{$y}, $d{$e} )->@* ];
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}
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}
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my $position = [0,0];
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use List::AllUtils qw/ reduce min /;
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$position = reduce { add($a,$d{$b}) } $position, split ',', $path;
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p %d;
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p %path;
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p $position;
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my @position = map { abs } @$position;
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my $to_go = 0;
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my $i = min @position;
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$to_go = 2 * $i;
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@position = map { $_ - $i } @position;
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$to_go += 2 * $position[0] + $position[1];
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say $to_go;
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sub add($x,$y) {
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[ map { $x->[$_] + $y->[$_] } 0..1 ]
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}
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