32 lines
548 B
Perl
32 lines
548 B
Perl
use 5.20.0;
|
|
|
|
use List::AllUtils qw/ uniq max /;
|
|
|
|
use experimental qw/ signatures /;
|
|
|
|
my %dist;
|
|
while(<>) {
|
|
my( $from, $to, $dist ) = split / (?:to|=) /;
|
|
$dist{$from}{$to} = $dist{$to}{$from} = $dist;
|
|
}
|
|
|
|
my @cities = uniq keys %dist;
|
|
|
|
say max map {
|
|
my @c = @cities;
|
|
max_distance( splice( @c, $_, 1 ), @c )
|
|
} 0..$#cities;
|
|
|
|
sub max_distance( $src, @left ) {
|
|
return 0 unless @left;
|
|
|
|
return max map {
|
|
$dist{$src}{$left[ $_ ]} + max_distance( $left[$_], @left[0..$_-1], @left[$_+1..$#left] )
|
|
} 0..$#left;
|
|
|
|
|
|
|
|
|
|
|
|
}
|