/
ch-2.pl
executable file
·46 lines (38 loc) · 888 Bytes
/
ch-2.pl
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#!/usr/bin/perl
use 5.030;
use warnings;
sub unique {
my ($arr) = @_;
my %unique;
for my $elem (@{$arr}) {
$unique{$elem}++;
}
return keys %unique;
}
sub union {
my %count;
my ($arr1, $arr2, $arr3) = @_;
foreach my $elem (@{$arr1}, @{$arr2}, @{$arr3}) { $count{$elem}++ };
return keys %count;
}
sub intersection {
my ($arr1, $arr2) = @_;
my %count;
foreach my $elem (unique($arr1), unique($arr2)) { $count{$elem}++ };
return [ grep { $_ if $count{$_} > 1 } keys %count ];
}
my ($array1, $array2, $array3) = map { [split / /] } @ARGV;
say
q{(},
(
join q{, },
(
sort { $a <=> $b }
union(
intersection($array1, $array2),
intersection($array2, $array3),
intersection($array1, $array3)
)
)
),
q{)};