A Perl Solution to Lars' Problem

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Posted by enrico
Thu, 07 Sep 2006 00:02:00 GMT

Stimulated by Marco, and by this post, I wanted to add my personal contribution…

Instead of jumping on the winner’s bandwagon like Marco, I opted for Perl, a language (once) de rigueur for problems like this. 

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my $numlines = $ARGV[0] or die "Missing parameter\n";
my %wcount; 

while (<STDIN>) {
        tr/A-Z/a-z/;
        for my $s (split /[^a-z0-9]+/) {
            next unless $s; 
            $wcount{$s}++;
    }
}

for my $w (sort { $wcount{$b} <=> $wcount{$a} } sort keys %wcount) {
    print $wcount{$w}, " $w\n";
    last unless --$numlines;
}
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