G'day supriyoch_2008,
Here's a technique that involves using the lengths of the original strings as hash keys.
$ perl -Mstrict -Mwarnings -E '
use autodie qw{:all};
my $ext = ".txt";
my @nums = 1 .. 3;
my %result;
for (@nums) {
open my $fh, "<", $_ . $ext;
while (<$fh>) {
chomp;
y/,//d;
next unless length;
$result{+length} .= $_;
}
close $fh;
}
my @sorted_keys = sort { $a <=> $b } keys %result;
say "*** Input Data Strings ***";
say "Shortest: ", $sorted_keys[0];
say "Longest: ", $sorted_keys[-1];
say "*** Output Data Strings ***";
say $result{$_} for @sorted_keys;
say "*** Two Shortest ***";
say $result{$_} for @sorted_keys[0, 1];
say "*** Two Longest ***";
say $result{$_} for @sorted_keys[-2, -1];
'
*** Input Data Strings ***
Shortest: 1
Longest: 5
*** Output Data Strings ***
ATG
AATTGG
AAATTTGGG
AAAATTTTGGGG
AAAAATTTTTGGGGG
*** Two Shortest ***
ATG
AATTGG
*** Two Longest ***
AAAATTTTGGGG
AAAAATTTTTGGGGG
I'm not sure how much of your other output was actually required or just for debugging;
regardless, you should be able to add code for that quite easily.
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