This must be well-known, but I can't seem to find a good answer: given a range and size, what's the best way to find a set of distinct random numbers? i.e. 
sub distinct_random_int{
   my($num, $start,$end) = @_;

   #return an arry of size $num
}

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Updated: changed "different" to "distinct" after Aristotle's remark.

In reply to How to generate distinct random numbers? by johnnywang

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