51 lines
839 B
Perl
51 lines
839 B
Perl
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use 5.20.0;
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use DDP;
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use experimental 'postderef', 'signatures';
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use List::AllUtils qw/ reduce min max /;
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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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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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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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my $max_distance;
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$position = reduce {
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my $p = add($a,$d{$b});
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$max_distance = max $max_distance, total_distance(@$p);
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$p;
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} $position, split ',', $path;
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say $max_distance;
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sub total_distance ( @position ) {
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my @position = map { abs } @position;
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my $i = min @position;
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return $i + 2 * ( $position[0] - $i) + $position[1];
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}
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sub add($x,$y) {
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[ map { $x->[$_] + $y->[$_] } 0..1 ]
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}
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