well, the algorithm on my previous post is actually O(N^2) on the worst case because of the splice.

A better version is: 

@array = sort @array;
my $j = 0;
my $last;
for my $e (@array) {
  if (!$j or $last ne $e) {
    $array[$j] = $last = $e;
    $j++;
  }
}
$#array = $j-1;

[download]

In reply to Re^2: Howto Avoid Memory Problem in List::MoreUtils by salva
in thread Howto Avoid Memory Problem in List::MoreUtils by Anonymous Monk

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