I don't think the OP has just an array of numbers. I think it is a series of minimums and maximums separated by a colon.

my @array = qw/0:2 4:6 8:12/;
my %hash;

foreach my $ele (@array) {
    my @temp = split /:/, $ele;
    $hash{$_}++ foreach $temp[0]..$temp[1];
}
[download]

I'll let the OP figure out how to deal with max:min pairs. The code I provided will only work for min:max pairs.

Updated with snippet. (I hope I did not do too much work for the OP.)