comparing values of range from different arrays

Question

i am trying to compare values of range from @arr3 with values of range from @arr4 but i am not getting the desired output. please suggest me the modifications in the following c

Answer 1

Use a hash:

my @arr3 = (1..5, 5..10, 10..15); 
my @arr4=(3..7, 9..12, 14..17);

my (%nums1, %nums2);

$nums1{$_} = 1 foreach(@arr3);
$nums2{$_} = 1 foreach(@arr4);

foreach (sort { abs $a <=> abs $b} keys %nums1){
    print "$_\n" if exists $nums2{$_} 
}