I'm looking for a faster way to determine if all the digits in a 10 character string are unique. Running this once is fast enough, but my program does this thousands of times. Each time the string is different, of course. One slow way: #!/usr/bin/perl -w
use strict;
while ( <> ) {
chomp;
die unless /^\d{10}$/;
&uniq ( $_ ) == 1 ? print "1\n" : print "0\n";
}
sub uniq {
for ( 0 .. 9 ) {
return 0 if $_[0] !~ /$_/;
}
return 1;
}
Another slow way: #!/usr/bin/perl -w
use strict;
while ( <> ) {
chomp;
die unless /^\d{10}$/;
&uniq ( $_ ) == 1 ? print "1\n" : print "0\n";
}
sub uniq {
my $x = $_[0];
my @x = sort split //, $x;
$x = join "", @x;
$x =~ tr/0-9//s;
length $x == 10 ? return 1 : return 0;
}
Thanks!
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|