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

[download]

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.

-- Ken

In reply to Re: How can one join the shortest and longest strings of different text files? by kcott
in thread How can one join the shortest and longest strings of different text files? by supriyoch_2008

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.