Given an array of size N in which every number is between 1
and N, determine if there are any duplicates in it. You are
allowed to destroy the array if you like.
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Answer Posted / madhu h gopala
@arr = (6,7,4,1,9,8,7,1);
print scalar @arr;
%seen = map {$_ => 1} @arr;
print scalar keys %seen
If the size of the array varies then there are duplicates
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