What have you tried? What worked? What didn't? See How do I post a question effectively? In your previous posts, you've always put up code.

Does order in the output matter? The easiest solution I can see would be to sort your entries first by the first number ascending, and then by the second number descending. You can then cycle through the list, and any time the current second number is less than the biggest one you've seen so far, you know you've gotten a subset. 

#!/usr/bin/perl
use strict;
use warnings;
use 5.10.0;

my @terms;
while (<DATA>) {
    chomp;
    push @terms, [split /\s+/];
}

my $biggest = 0;
for my $term (sort sorter @terms) {
    if ($term->[2] > $biggest) {
        say join ' ', @$term;
        $biggest = $term->[2];
    }    
}

sub sorter {
     $a->[1] <=> $b->[1]
  || $b->[2] <=> $a->[2]
}
__DATA__
SEQ1 225 275
SEQ1 200 300
SEQ1 201 299
SEQ1 250 399
SEQ1 145 244
SEQ2 120 130
SEQ2 100 150
SEQ2 101 149
SEQ2 120 230
SEQ2 99 140

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#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

In reply to Re: Discard if present within other coordinate range by kennethk
in thread Discard if present within other coordinate range by jnarayan81

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