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#!/usr/local/bin/perl
use strict;
use warnings;
use feature qw(say);
use Test::More;
use Benchmark qw(cmpthese timethis);
use Data::Dumper qw(Dumper);
my @ACC = (
[ ['A', 'a1@a.com', 'a2@a.com'],
['B', 'b1@b.com'],
['A', 'a3@a.com', 'a1@a.com'] ],
[ ['A', 'a1@a.com', 'a2@a.com'],
['B', 'b1@b.com'],
['A', 'a3@a.com'],
['B', 'b2@b.com', 'b1@b.com'] ],
[ ['A', 'a1@a.com', 'a2@a.com'],
['A', 'a3@a.com', 'a4@a.com'],
['A', 'a2@a.com', 'a4@a.com'] ],
[ ['A', 'a1@a.com', 'a2@a.com'],
['A', 'a2@a.com', 'a3@a.com'],
['A', 'a3@a.com', 'a4@a.com'],
['A', 'a4@a.com', 'a5@a.com'],
['A', 'a5@a.com', 'a6@a.com'] ],
[ ['A', 'a1@a.com', 'a2@a.com'],
['A', 'a3@a.com', 'a4@a.com'],
['A', 'a5@a.com', 'a6@a.com'],
['A', 'a7@a.com', 'a8@a.com'],
['A', 'a1@a.com', 'a3@a.com'],
['A', 'a5@a.com', 'a7@a.com'],
['A', 'a1@a.com', 'a5@a.com'] ],
);
say Dumper(merge_accounts( $_ )) for @ACC;
sub merge_accounts {
my($in,$out,%seen,$t) = ([],shift);
while(@{$out}!=@{$in}) {
($in,$out,%seen) = ($out,[]);
O: for my $acc (@{$in}) {
my( $name, @e )=@{ $acc };
for(@e) {
if( exists $seen{$_} ) {
my( $m, @f ) = @{ $out->[ $t = $seen{$_} ] };
my %T = map { $_=>1 } @e, @f;
$seen{$_} = $t for keys %T;
$out->[ $t ] = [ $m, keys %T ];
next O;
}
}
$seen{$_} = @{$out} for @e;
push @{$out},$acc;
}
}
$out
}
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