Hi all, I know this question has been asked before. But what's different now, is I want to sort an AofA based on the uniqueness of 2 columns - all done without using Map or Grep. I have a simple code that can work on a 1-dimension array. Can someone advice on how I can modify it to do a sort based on 2 columns? Thanks. 
my @array;
push @{@array},["1", "1", "3"];
push @{@array},["1", "5", "6"];
push @{@array},["1", "1", "3"];

my @unique = ();
my %seen = ();

foreach my $elem ( @array) {

        next if $seen{ $elem }++;
        push @unique, $elem;

}

for my $i (0 .. $#unique) {
        print "\n$unique[$i][0] $unique[$i][1] $unique[$i][2]";
}
print "\n";

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In reply to Removing duplicates in Array of Array by iphony

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