Hi monks I need your help about perl. I will compare three values. Ther are $a=TTTATTT, $b=TTTTTTT, $c=TBTTTTT. When I compare $a and $b, then I want to catch only "A". Also When I compare $b and $c, then I want to catch "B". Of course below script I can comapre using function "split". but there are so many loop that script's performance is really bad... Can you help me about that issue?? Performance is the best important thing I think.. thank you :) 
@a = split(//,$a);
@b = split(//,$b);
@c = split(//,$c);
foreach $a(@a){$test{$a}++}
foreach $b(@b){$test($b)++}
foreach $c(@c){$test($c)++)
foreach $test(keys %test){if($test{$test} eq 1){print "only one : $tes
+t\n"}}

[download]

In reply to compare initial by dideod.yang

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.