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Re: removing duplicated elements from array, with a difference

by krujos (Curate)
on Aug 28, 2002 at 18:21 UTC ( #193529=note: print w/replies, xml ) Need Help??

in reply to removing duplicated elements from array, with a difference

This is probably not the most efficient way to do this but it will work. This uses a hash to keep track of the duplicates.
my %hash; my @NewArray; #read all of the values of the array into keys of the hash, #this eliminates all of the duplicates foreach my $var (@OriginalArray) { $hash{$var}=0; } #this loop marks any variable that appeared twice in the #original array. foreach my $var2 (@OriginalArray) { $hash{$var}++; } #This fills a new array based on the information from the #above loop foreach my $var3 (keys (%hash)) { if (!$hash{$var3} > 1) { print "$hash{$var3} deleted\n"; } else { $NewArray[@NewArray]=$hash{$var3}; } } @OriginalArray = @NewArray;
update ++dpuu and thelenm for their much better and more efficient answers to this question.

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