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Find the element which are duplicated in an array

Posted on 2011-09-30
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Last Modified: 2012-05-12
Hello, I am able to get the list of unique element from an array but how to get the elements which are duplicate in an array is not coming in my find. Could someone please share perl one line to get it done please. Thanks!
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Question by:beer9
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3 Comments
 
LVL 84

Expert Comment

by:ozo
ID: 36890344
have you read
perldoc -q duplicate
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Accepted Solution

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nemws1 earned 500 total points
ID: 36892831
If you're using something like this to get unique elements (you may have it more drawn out - and also, this is from the document ozo has pointed you to):
foreach my $elem ( @array )
{
    next if $seen{ $elem }++;
    push @unique, $elem;
}

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Then you are half there.  Just look at the %seen assoc. array and look for values greater than 1.
my @dup;
for (%seen) { push(@dup, $_) if $seen{$_} > 1; };
print "@dup\n";

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Author Closing Comment

by:beer9
ID: 36935026
Thank you! :)
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