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time |
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1
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package Algorithm::Graphs::TransitiveClosure::Tiny;
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2
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3
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2
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2
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170378
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use 5.010;
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2
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19
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4
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2
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2
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13
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use strict;
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2
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4
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2
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78
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5
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2
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2
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21
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use warnings;
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2
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5
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2
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79
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6
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7
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2
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2
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11
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use Exporter 'import';
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2
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4
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2
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562
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8
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9
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our @EXPORT_OK = qw(floyd_warshall);
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10
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11
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our $VERSION = '1.00';
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12
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13
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14
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sub floyd_warshall {
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15
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9
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9
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0
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10851
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my $graph = shift;
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16
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9
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27
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my $delEmpty = !shift;
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17
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18
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9
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17
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my @vertices = do {
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19
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9
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17
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my %vertices;
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20
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9
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35
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foreach my $v (keys(%$graph)) {
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21
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26
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100
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39
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if (%{$graph->{$v}}) {
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26
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100
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67
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22
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24
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40
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@vertices{$v, keys(%{$graph->{$v}})} = ();
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24
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79
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23
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} elsif ($delEmpty) {
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24
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1
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4
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delete $graph->{$v};
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25
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}
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26
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}
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27
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9
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36
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keys %vertices;
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28
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};
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29
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9
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20
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foreach my $k (@vertices) {
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30
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28
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65
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foreach my $i (@vertices) {
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31
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106
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161
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foreach my $j (@vertices) {
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32
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$graph->{$i}->{$j} = undef if (exists($graph->{$k}) && exists($graph->{$k}->{$j}) &&
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33
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exists($graph->{$i}) && exists($graph->{$i}->{$k})
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34
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424
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100
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100
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1735
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&& !exists($graph->{$i}->{$j}));
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100
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100
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100
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35
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}
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36
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}
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37
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}
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38
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9
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32
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return $graph;
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39
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}
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40
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41
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42
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43
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1; # End of Algorithm::Graphs::TransitiveClosure::Tiny
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44
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45
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46
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47
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48
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__END__
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