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