和集合 A∪B my @array_a = qw/1 2 3 4 5/; my @array_b = qw/3 4 5 6 7/; my %cnt = (); my @array = grep { ++$cnt{$_} == 1 } (@array_a, @array_b); 積集合 A∩B my @array_a = qw/1 2 3 4 5/; my @array_b = qw/3 4 5 6 7/; my %cnt = (); my @array = gr…