In an recent work, I have to compare two splitted regions, and found the intersection (or substraction, etc) of it. To achieve this, I used string masking system like below: 
my $region1=[[1,2],[5,7]];
my $region2=[[2,6]];

my $mask1=&toMask($region1);            # 1100111
my $mask2=&toMask($region2);            # 0111110

my $mask3=&maskAND($region1,$region2);  # 0100110

sub toMask {
    my @regions=@_;
    my @result;

    foreach my $curr (@regions) {
        for (my $i=$curr->[0];$i<=$curr->[1];$i++) {
            $result[$i-1]=1;
        }
    }

    for (my $i=0;$i<@result;$i++) {
        $result[$i]=0 if ($result[$i]!=1);
    }
    return join "",@result;
}

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However, when the region is big, the masking string becomes critically large and caused memory problem. So how can I pack the region AoA to some binary thing directly?
Thanks!

In reply to boolean calculation with very large data by llancet

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